diff --git a/.eslintrc b/.eslintrc
index fb7b9841bb670442504403efe5a08fea2c28bd5b..028ba73c90d0499ada5fdb8333828bb1dd55e9ac 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -49,6 +49,13 @@
     "prefer-const": "error",
     "no-trailing-spaces": "error",
     "react/prop-types": 0,
-    "max-len": [1, {"ignoreStrings": true}]
+    "max-len": [
+      1,
+      {
+        "ignoreStrings": true,
+        "ignoreComments": true,
+        "ignoreTemplateLiterals": true
+      }
+    ]
   }
 }
\ No newline at end of file
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000000000000000000000000000000000000..61d18602bd64e167b6fe05ee64bcd79bc67157fb
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
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+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/README.md b/README.md
index a2662ae11754f6f7f03416ddf9d49d6d1edccce0..a186717beed044a7c806def957d25be2cb7bf5ba 100644
--- a/README.md
+++ b/README.md
@@ -4,10 +4,7 @@ A menstrual cycle tracking app that's open-source and leaves your data on your p
 
 ## Development setup
 
-1.
-
-a) Start a virtual device in Android Studio (or make sure it's already running, you should see a phone on your screen)
-b) Set your physical device like your phone up to run the app.
+1. Either start a virtual device in Android Studio (or make sure it's already running, you should see a phone on your screen) or set your physical device like your phone up to run the app.
 
 2. Clone this repository:
 
diff --git a/components/app.js b/components/app.js
index b0924aa0b89b1baac2b7258e70fae8f431bb0c36..dbd3cfb98a1c3fbfb9c8322ec7aeac8663c9b676 100644
--- a/components/app.js
+++ b/components/app.js
@@ -19,28 +19,27 @@ export default class App extends Component {
     this.state = {
       currentPage: 'Home'
     }
-
-    const handleBackButtonPress = function() {
-      if (this.state.currentPage === 'Home') return false
-      if (isSymptomView(this.state.currentPage)) {
-        this.navigate('CycleDay', {cycleDay: this.state.currentProps.cycleDay})
-      } else {
-        this.navigate('Home')
-      }
-      return true
-    }.bind(this)
-
-    this.backHandler = BackHandler.addEventListener('hardwareBackPress', handleBackButtonPress)
+    this.backHandler = BackHandler.addEventListener('hardwareBackPress', this.handleBackButtonPress)
   }
 
   componentWillUnmount() {
     this.backHandler.remove()
   }
 
-  navigate(pageName, props) {
+  navigate = (pageName, props) => {
     this.setState({currentPage: pageName, currentProps: props})
   }
 
+  handleBackButtonPress = () => {
+    if (this.state.currentPage === 'Home') return false
+    if (isSymptomView(this.state.currentPage)) {
+      this.navigate('CycleDay', { cycleDay: this.state.currentProps.cycleDay })
+    } else {
+      this.navigate('Home')
+    }
+    return true
+  }
+
   render() {
     const page = {
       Home, Calendar, CycleDay, Chart, Settings, Stats, ...symptomViews
@@ -51,12 +50,12 @@ export default class App extends Component {
         {this.state.currentPage != 'CycleDay' && <Header title={titles[this.state.currentPage]} />}
 
         {React.createElement(page, {
-          navigate: this.navigate.bind(this),
+          navigate: this.navigate,
           ...this.state.currentProps
         })}
 
         {!isSymptomView(this.state.currentPage) &&
-          <Menu navigate={this.navigate.bind(this)} />
+          <Menu navigate={this.navigate} />
         }
       </View>
     )
diff --git a/components/calendar.js b/components/calendar.js
index 2e70c4a9cb932a7ac5049a66a5d0d9037536565e..d579c31e31580708d8542a53cc08bd81a5a92767 100644
--- a/components/calendar.js
+++ b/components/calendar.js
@@ -29,7 +29,7 @@ export default class CalendarView extends Component {
     bleedingDaysSortedByDate.removeListener(this.setStateWithCalFormattedDays)
   }
 
-  passDateToDayView(result) {
+  passDateToDayView = (result) => {
     const cycleDay = getOrCreateCycleDay(result.dateString)
     const navigate = this.props.navigate
     navigate('CycleDay', { cycleDay })
diff --git a/components/chart/chart.js b/components/chart/chart.js
index c9c2b1d3e7b17691a3b59a12e57e8e892fc0cf6d..02489794c0ec1f16952da3df0323fcc4115651fe 100644
--- a/components/chart/chart.js
+++ b/components/chart/chart.js
@@ -1,51 +1,123 @@
 import React, { Component } from 'react'
-import { View, FlatList, ScrollView } from 'react-native'
+import { View, FlatList, Text } from 'react-native'
 import range from 'date-range'
 import { LocalDate } from 'js-joda'
-import { yAxis, normalizeToScale, horizontalGrid } from './y-axis'
-import setUpFertilityStatusFunc from './nfp-lines'
+import { makeYAxisLabels, normalizeToScale, makeHorizontalGrid } from './y-axis'
+import nfpLines from './nfp-lines'
 import DayColumn from './day-column'
 import { getCycleDay, cycleDaysSortedByDate, getAmountOfCycleDays } from '../../db'
 import styles from './styles'
-
-const yAxisView = <View {...styles.yAxis}>{yAxis.labels}</View>
+import { scaleObservable } from '../../local-storage'
+import config from '../../config'
 
 export default class CycleChart extends Component {
   constructor(props) {
     super(props)
-    this.state = {
-      columns: makeColumnInfo(setUpFertilityStatusFunc()),
-    }
+    this.state = {}
     this.renderColumn = ({item, index}) => {
       return (
         <DayColumn
           {...item}
           index={index}
           navigate={this.props.navigate}
+          chartHeight={this.state.chartHeight}
         />
       )
     }
+  }
 
-    this.reCalculateChartInfo = (function(Chart) {
-      return function() {
-        Chart.setState({columns: makeColumnInfo(setUpFertilityStatusFunc())})
-      }
-    })(this)
+  onLayout = ({ nativeEvent }) => {
+    if (this.state.chartHeight) return
+
+    const height = nativeEvent.layout.height
+    this.setState({ chartHeight: height })
+    this.reCalculateChartInfo = () => {
+      this.setState({ columns: this.makeColumnInfo(nfpLines(height)) })
+    }
 
     cycleDaysSortedByDate.addListener(this.reCalculateChartInfo)
+    this.removeObvListener = scaleObservable(this.reCalculateChartInfo, false)
   }
 
   componentWillUnmount() {
     cycleDaysSortedByDate.removeListener(this.reCalculateChartInfo)
+    this.removeObvListener()
+  }
+
+  makeColumnInfo(getFhmAndLtlInfo) {
+    let amountOfCycleDays = getAmountOfCycleDays()
+    // if there's not much data yet, we want to show at least 30 days on the chart
+    if (amountOfCycleDays < 30) {
+      amountOfCycleDays = 30
+    } else {
+      // we don't want the chart to end abruptly before the first data day
+      amountOfCycleDays += 5
+    }
+    const jsDates = getTodayAndPreviousDays(amountOfCycleDays)
+    const xAxisDates = jsDates.map(jsDate => {
+      return LocalDate.of(
+        jsDate.getFullYear(),
+        jsDate.getMonth() + 1,
+        jsDate.getDate()
+      ).toString()
+    })
+
+    const columns = xAxisDates.map(dateString => {
+      const cycleDay = getCycleDay(dateString)
+      const symptoms = ['temperature', 'mucus', 'bleeding'].reduce((acc, symptom) => {
+        acc[symptom] = cycleDay && cycleDay[symptom] && cycleDay[symptom].value
+        acc[`${symptom}Exclude`] = cycleDay && cycleDay[symptom] && cycleDay[symptom].exclude
+        return acc
+      }, {})
+
+      const temp = symptoms.temperature
+      const columnHeight = this.state.chartHeight * config.columnHeightPercentage
+      return {
+        dateString,
+        y: temp ? normalizeToScale(temp, columnHeight) : null,
+        ...symptoms,
+        ...getFhmAndLtlInfo(dateString, temp)
+      }
+    })
+
+    return columns.map((col, i) => {
+      const info = getInfoForNeighborColumns(i, columns)
+      return Object.assign(col, info)
+    })
   }
 
   render() {
+    let columnHeight
+    let symptomRowHeight
+    if (this.state.chartHeight) {
+      columnHeight = this.state.chartHeight * config.columnHeightPercentage
+      symptomRowHeight = this.state.chartHeight * config.symptomRowHeightPercentage
+    }
     return (
-      <ScrollView>
-        <View style={{ flexDirection: 'row', marginTop: 50 }}>
-          {yAxisView}
-          {horizontalGrid}
-          {<FlatList
+      <View
+        onLayout={this.onLayout}
+        style={{ flexDirection: 'row', flex: 1 }}
+      >
+        {!this.state.chartLoaded &&
+          <View style={{width: '100%', justifyContent: 'center', alignItems: 'center'}}>
+            <Text>Loading...</Text>
+          </View>
+        }
+
+        {this.state.chartHeight && this.state.chartLoaded &&
+          <View
+            style={[styles.yAxis, {
+              height: columnHeight,
+              marginTop: symptomRowHeight
+            }]}
+          >
+            {makeYAxisLabels(columnHeight)}
+          </View>}
+
+        {this.state.chartHeight && this.state.chartLoaded && makeHorizontalGrid(columnHeight, symptomRowHeight)}
+
+        {this.state.chartHeight &&
+          <FlatList
             horizontal={true}
             inverted={true}
             showsHorizontalScrollIndicator={false}
@@ -54,52 +126,14 @@ export default class CycleChart extends Component {
             keyExtractor={item => item.dateString}
             initialNumToRender={15}
             maxToRenderPerBatch={5}
-          >
-          </FlatList>}
-        </View>
-      </ScrollView>
+            onLayout={() => this.setState({chartLoaded: true})}
+          />
+        }
+      </View>
     )
   }
 }
 
-function makeColumnInfo(getFhmAndLtlInfo) {
-  let amountOfCycleDays = getAmountOfCycleDays()
-  // if there's not much data yet, we want to show at least 30 days on the chart
-  if (amountOfCycleDays < 30) {
-    amountOfCycleDays = 30
-  } else {
-    // we don't want the chart to end abruptly before the first data day
-    amountOfCycleDays += 5
-  }
-  const xAxisDates = getTodayAndPreviousDays(amountOfCycleDays).map(jsDate => {
-    return LocalDate.of(
-      jsDate.getFullYear(),
-      jsDate.getMonth() + 1,
-      jsDate.getDate()
-    ).toString()
-  })
-
-  const columns = xAxisDates.map(dateString => {
-    const cycleDay = getCycleDay(dateString)
-    const symptoms = ['temperature', 'mucus', 'bleeding'].reduce((acc, symptom) => {
-      acc[symptom] = cycleDay && cycleDay[symptom] && cycleDay[symptom].value
-      acc[`${symptom}Exclude`] = cycleDay && cycleDay[symptom] && cycleDay[symptom].exclude
-      return acc
-    }, {})
-
-    return {
-      dateString,
-      y: symptoms.temperature ? normalizeToScale(symptoms.temperature) : null,
-      ...symptoms,
-      ...getFhmAndLtlInfo(dateString, symptoms.temperature)
-    }
-  })
-
-  return columns.map((col, i) => {
-    const info = getInfoForNeighborColumns(i, columns)
-    return Object.assign(col, info)
-  })
-}
 
 function getTodayAndPreviousDays(n) {
   const today = new Date()
diff --git a/components/chart/config.js b/components/chart/config.js
deleted file mode 100644
index ec3509ef3d24b6cbb17d962a6703a40e357b6089..0000000000000000000000000000000000000000
--- a/components/chart/config.js
+++ /dev/null
@@ -1,16 +0,0 @@
-const config = {
-  chartHeight: 350,
-  columnWidth: 25,
-  temperatureScale: {
-    low: 35,
-    high: 38,
-    units: 0.1
-  }
-}
-
-const margin = 3
-config.columnMiddle = config.columnWidth / 2,
-config.dateRowY = config.chartHeight - 15 - margin
-config.cycleDayNumberRowY = config.chartHeight - margin
-
-export default config
\ No newline at end of file
diff --git a/components/chart/day-column.js b/components/chart/day-column.js
index a7ccfb1fb446dcd7512767626f8d304c8492ceaf..268df062d7198fed96b801466ce76ee75ae7bb8e 100644
--- a/components/chart/day-column.js
+++ b/components/chart/day-column.js
@@ -4,7 +4,7 @@ import {
 } from 'react-native'
 import Icon from 'react-native-vector-icons/Entypo'
 import styles from './styles'
-import config from './config'
+import config from '../../config'
 import { getOrCreateCycleDay } from '../../db'
 import cycleModule from '../../lib/cycle'
 import DotAndLine from './dot-and-line'
@@ -34,48 +34,15 @@ export default class DayColumn extends Component {
       rightY,
       rightTemperatureExclude,
       leftY,
-      leftTemperatureExclude
+      leftTemperatureExclude,
+      chartHeight
     } = this.props
 
-    const columnElements = []
-    if (typeof bleeding === 'number') {
-      columnElements.push(
-        <Icon
-          name='drop'
-          position='absolute'
-          size={18}
-          color='#900'
-          style={{ marginTop: 10, marginLeft: 3 }}
-          key='bleeding'
-        />
-      )
-    }
-
-    if (typeof mucus === 'number') {
-      const mucusIcon = (
-        <View
-          position='absolute'
-          top = {40}
-          left = {config.columnMiddle - styles.mucusIcon.width / 2}
-          {...styles.mucusIcon}
-          backgroundColor={styles.mucusIconShades[mucus]}
-          key='mucus'
-        />
-      )
-      columnElements.push(mucusIcon)
-    }
+    const columnHeight = chartHeight * config.columnHeightPercentage
+    const xAxisHeight = chartHeight * config.xAxisHeightPercentage
+    const symptomHeight = chartHeight * config.symptomRowHeightPercentage
 
-    if(drawFhmLine) {
-      const fhmLine = (<View
-        position = 'absolute'
-        top={100}
-        width={styles.nfpLine.strokeWidth}
-        height={200}
-        {...styles.nfpLine}
-        key='fhm'
-      />)
-      columnElements.push(fhmLine)
-    }
+    const columnElements = []
 
     if(drawLtlAt) {
       const ltlLine = (<View
@@ -105,25 +72,31 @@ export default class DayColumn extends Component {
     const cycleDayNumber = getCycleDayNumber(dateString)
     const shortDate = dateString.split('-').slice(1).join('-')
     const cycleDayLabel = (
-      <Text style={label.number} y={config.cycleDayNumberRowY}>
+      <Text style={label.number}>
         {cycleDayNumber}
       </Text>)
     const dateLabel = (
-      <Text style = {label.date} y={config.dateRowY}>
+      <Text style = {label.date}>
         {shortDate}
       </Text>
     )
-    columnElements.push(
-      <View position='absolute' bottom={0} key='date'>
-        {cycleDayLabel}
-        {dateLabel}
-      </View>
-    )
 
-    return React.createElement(
+    // we merge the colors here instead of from the stylesheet because of a RN
+    // bug that doesn't apply borderLeftColor otherwise
+    const customStyle = {
+      height: columnHeight,
+      borderLeftColor: 'grey',
+      borderRightColor: 'grey'
+    }
+
+    if (drawFhmLine) {
+      customStyle.borderLeftColor = styles.nfpLine.borderColor
+      customStyle.borderLeftWidth = 3
+    }
+    const column = React.createElement(
       TouchableOpacity,
       {
-        style: styles.column.rect,
+        style: [styles.column.rect, customStyle],
         key: this.props.index.toString(),
         onPress: () => {
           this.passDateToDayView(dateString)
@@ -132,5 +105,34 @@ export default class DayColumn extends Component {
       },
       columnElements
     )
+
+    return (
+      <View>
+        <View style={[styles.symptomRow, {height: symptomHeight}]}>
+          {typeof mucus === 'number' &&
+            <View
+              {...styles.mucusIcon}
+              backgroundColor={styles.mucusIconShades[mucus]}
+              key='mucus'
+            />
+          }
+          {typeof bleeding === 'number' &&
+            <Icon
+              name='drop'
+              size={18}
+              color='#900'
+              key='bleeding'
+            />
+          }
+        </View>
+
+        {column}
+
+        <View style={{height: xAxisHeight}}>
+          {cycleDayLabel}
+          {dateLabel}
+        </View>
+      </View>
+    )
   }
 }
\ No newline at end of file
diff --git a/components/chart/dot-and-line.js b/components/chart/dot-and-line.js
index 626cf02c9b401102368182442523c564f6dc84c6..418457f005888e5fd6ec327dcecd2162a5f57021 100644
--- a/components/chart/dot-and-line.js
+++ b/components/chart/dot-and-line.js
@@ -1,7 +1,7 @@
 import React, { Component } from 'react'
 import { View } from 'react-native'
 import styles from './styles'
-import config from './config'
+import config from '../../config'
 
 export default class DotAndLine extends Component {
   shouldComponentUpdate(newProps) {
diff --git a/components/chart/nfp-lines.js b/components/chart/nfp-lines.js
index d9f4507f67ea6583762646588f7e4013f46ef192..ded95e8197e1e28cba34a8fa05b3383a1a2412eb 100644
--- a/components/chart/nfp-lines.js
+++ b/components/chart/nfp-lines.js
@@ -1,7 +1,7 @@
 import { getCycleStatusForDay } from '../../lib/sympto-adapter'
 import { normalizeToScale } from './y-axis'
 
-export default function () {
+export default function (chartHeight) {
   const cycle = {
     status: null
   }
@@ -71,7 +71,7 @@ export default function () {
         dateIsInPeriOrPostPhase(dateString) &&
         isInTempMeasuringPhase(temperature, dateString)
       ) {
-        ret.drawLtlAt = normalizeToScale(tempShift.ltl)
+        ret.drawLtlAt = normalizeToScale(tempShift.ltl, chartHeight)
       }
     }
 
diff --git a/components/chart/styles.js b/components/chart/styles.js
index c018eb11b9ad76727979914072bb8365d7d20ea6..d7ab484d87067882f375750f7d1c4889ec543f90 100644
--- a/components/chart/styles.js
+++ b/components/chart/styles.js
@@ -1,4 +1,4 @@
-import config from './config'
+import config from '../../config'
 
 const styles = {
   curve: {
@@ -38,10 +38,9 @@ const styles = {
     },
     rect: {
       width: config.columnWidth,
-      height: config.chartHeight,
       borderStyle: 'solid',
-      borderColor: 'grey',
-      borderWidth: 0.5
+      borderLeftWidth: 0.5,
+      borderRightWidth: 0.5,
     }
   },
   bleedingIcon: {
@@ -63,7 +62,6 @@ const styles = {
     '#993299'
   ],
   yAxis: {
-    height: config.chartHeight,
     width: config.columnWidth,
     borderRightWidth: 0.5,
     borderColor: 'lightgrey',
@@ -88,6 +86,10 @@ const styles = {
     borderColor: '#00b159',
     borderWidth: 2,
     borderStyle: 'solid'
+  },
+  symptomRow: {
+    alignItems: 'center',
+    justifyContent: 'center'
   }
 }
 
diff --git a/components/chart/y-axis.js b/components/chart/y-axis.js
index ccc9404bb13a808e0fcd439ce32a7ca6d2ee10ec..27d1411663023b467a7970543682560bc7868571 100644
--- a/components/chart/y-axis.js
+++ b/components/chart/y-axis.js
@@ -1,53 +1,68 @@
 import React from 'react'
 import { Text, View } from 'react-native'
-import config from './config'
+import config from '../../config'
 import styles from './styles'
+import { scaleObservable } from '../../local-storage'
 
-function makeYAxis() {
-  const scale = config.temperatureScale
-  const scaleMin = scale.low
-  const scaleMax = scale.high
-  const numberOfTicks = (scaleMax - scaleMin) * (1 / scale.units)
-  const tickDistance = config.chartHeight / numberOfTicks
+export function makeYAxisLabels(columnHeight) {
+  const units = config.temperatureScale.units
+  const scaleMax = scaleObservable.value.max
+  const style = styles.yAxisLabel
 
-  const tickPositions = []
-  const labels = []
-  // for style reasons, we don't want the first and last tick
-  for (let i = 1; i < numberOfTicks - 1; i++) {
-    const y = tickDistance * i
-    const style = styles.yAxisLabel
+  return getTickPositions(columnHeight).map((y, i) => {
     // this eyeballing is sadly necessary because RN does not
     // support percentage values for transforms, which we'd need
     // to reliably place the label vertically centered to the grid
-    style.top = y - 8
-    labels.push(
+    if (scaleMax - i * units === 37) console.log(y)
+    return (
       <Text
-        style={{...style}}
+        style={[style, {top: y - 8}]}
         key={i}>
-        {scaleMax - i * scale.units}
+        {scaleMax - i * units}
       </Text>
     )
-    tickPositions.push(y)
+  })
+}
+
+export function makeHorizontalGrid(columnHeight, symptomRowHeight) {
+  return getTickPositions(columnHeight).map(tick => {
+    return (
+      <View
+        top={tick + symptomRowHeight}
+        {...styles.horizontalGrid}
+        key={tick}
+      />
+    )
+  })
+}
+
+function getTickPositions(columnHeight) {
+  const units = config.temperatureScale.units
+  const scaleMin = scaleObservable.value.min
+  const scaleMax = scaleObservable.value.max
+  const numberOfTicks = (scaleMax - scaleMin) * (1 / units) + 1
+  const tickDistance = 1 / (numberOfTicks - 1)
+
+  const tickPositions = []
+  for (let i = 0; i < numberOfTicks; i++) {
+    const position = getAbsoluteValue(tickDistance * i, columnHeight)
+    tickPositions.push(position)
   }
+  return tickPositions
+}
 
-  return {labels, tickPositions}
+export function normalizeToScale(temp, columnHeight) {
+  const scale = scaleObservable.value
+  const valueRelativeToScale = (scale.max - temp) / (scale.max - scale.min)
+  return getAbsoluteValue(valueRelativeToScale, columnHeight)
 }
 
-export const yAxis = makeYAxis()
-
-export const horizontalGrid = yAxis.tickPositions.map(tick => {
-  return (
-    <View
-      top={tick}
-      {...styles.horizontalGrid}
-      key={tick}
-    />
-  )
-})
-
-export function normalizeToScale(temp) {
-  const scale = config.temperatureScale
-  const valueRelativeToScale = (scale.high - temp) / (scale.high - scale.low)
-  const scaleHeight = config.chartHeight
-  return scaleHeight * valueRelativeToScale
+function getAbsoluteValue(relative, columnHeight) {
+  // we add some height to have some breathing room
+  const verticalPadding = columnHeight * config.temperatureScale.verticalPadding
+  const scaleHeight = columnHeight - 2 * verticalPadding
+  console.log(scaleHeight)
+  console.log(columnHeight)
+  return scaleHeight * relative + verticalPadding
+
 }
\ No newline at end of file
diff --git a/components/cycle-day/cycle-day-overview.js b/components/cycle-day/cycle-day-overview.js
index 168954f13b0564bab294f63a1a60593d8a44bfe9..85e8d48a59b75f4165cf0a8a3bb0ec229ae586c9 100644
--- a/components/cycle-day/cycle-day-overview.js
+++ b/components/cycle-day/cycle-day-overview.js
@@ -31,7 +31,7 @@ export default class CycleDayOverView extends Component {
     }
   }
 
-  goToCycleDay(target) {
+  goToCycleDay = (target) => {
     const localDate = LocalDate.parse(this.state.cycleDay.date)
     const targetDate = target === 'before' ?
       localDate.minusDays(1).toString() :
@@ -55,7 +55,7 @@ export default class CycleDayOverView extends Component {
           isCycleDayOverView={true}
           cycleDayNumber={cycleDayNumber}
           date={cycleDay.date}
-          goToCycleDay={this.goToCycleDay.bind(this)}
+          goToCycleDay={this.goToCycleDay}
         />
         <ScrollView>
           <View style={styles.symptomBoxesView}>
@@ -134,7 +134,10 @@ function getLabel(symptomName, symptom) {
     cervix: cervix => {
       let cervixLabel = []
       if (cervix.opening > -1 && cervix.firmness > -1) {
-        cervixLabel.push(openingLabels[cervix.opening], firmnessLabels[cervix.firmness])
+        cervixLabel.push(
+          openingLabels[cervix.opening],
+          firmnessLabels[cervix.firmness]
+        )
         if (cervix.position > -1) {
           cervixLabel.push(positionLabels[cervix.position])
         }
diff --git a/components/cycle-day/labels/labels.js b/components/cycle-day/labels/labels.js
index fba3197f9149f912ce0041c7434c9c0151988378..6650e335efde0c62ad1e55ba181dd230e0db7e2f 100644
--- a/components/cycle-day/labels/labels.js
+++ b/components/cycle-day/labels/labels.js
@@ -26,3 +26,9 @@ export const fertilityStatus = {
   fertileUntilEvening: 'Fertile phase ends in the evening',
   unknown: 'We cannot show any cycle information because no menses has been entered'
 }
+
+export const temperature = {
+  outOfRangeWarning: 'This temperature value is out of the current range for the temperature chart. You can change the range in the settings.',
+  outOfAbsoluteRangeWarning: 'This temperature value is too high or low to be shown on the temperature chart.',
+  saveAnyway: 'Save anyway'
+}
diff --git a/components/cycle-day/symptoms/action-button-footer.js b/components/cycle-day/symptoms/action-button-footer.js
index a1534964ea7cfeb0b7e651bdf5c590463b098acf..dac39a6a82fa036b6a4645bcec941064c588551b 100644
--- a/components/cycle-day/symptoms/action-button-footer.js
+++ b/components/cycle-day/symptoms/action-button-footer.js
@@ -8,7 +8,14 @@ import styles, {iconStyles} from '../../../styles'
 
 export default class ActionButtonFooter extends Component {
   render() {
-    const { symptom, cycleDay, saveAction, saveDisabled, navigate} = this.props
+    const {
+      symptom,
+      cycleDay,
+      saveAction,
+      saveDisabled,
+      navigate,
+      autoShowDayView = true}
+      = this.props
     const navigateToOverView = () => navigate('CycleDay', {cycleDay})
     const buttons = [
       {
@@ -28,7 +35,7 @@ export default class ActionButtonFooter extends Component {
         title: 'Save',
         action: () => {
           saveAction()
-          navigateToOverView()
+          if (autoShowDayView) navigateToOverView()
         },
         disabledCondition: saveDisabled,
         icon: 'content-save-outline'
diff --git a/components/cycle-day/symptoms/temperature.js b/components/cycle-day/symptoms/temperature.js
index 629f5b20b2ee627ac5cdd6c4e0661edb9ae44893..11ee7dae56311d64398780bde7926a7f0bb83cd4 100644
--- a/components/cycle-day/symptoms/temperature.js
+++ b/components/cycle-day/symptoms/temperature.js
@@ -5,6 +5,7 @@ import {
   TextInput,
   Switch,
   Keyboard,
+  Alert,
   ScrollView
 } from 'react-native'
 import DateTimePicker from 'react-native-modal-datetime-picker-nevo'
@@ -12,35 +13,84 @@ import DateTimePicker from 'react-native-modal-datetime-picker-nevo'
 import { getPreviousTemperature, saveSymptom } from '../../../db'
 import styles from '../../../styles'
 import { LocalTime, ChronoUnit } from 'js-joda'
+import { temperature as tempLabels } from '../labels/labels'
+import { scaleObservable } from '../../../local-storage'
+import { shared } from '../../labels'
 import ActionButtonFooter from './action-button-footer'
+import config from '../../../config'
 
-const MINUTES = ChronoUnit.MINUTES
+const minutes = ChronoUnit.MINUTES
 
 export default class Temp extends Component {
   constructor(props) {
     super(props)
     this.cycleDay = props.cycleDay
     this.makeActionButtons = props.makeActionButtons
-    let initialValue
 
     const temp = this.cycleDay.temperature
 
+    this.state = {
+      exclude: temp ? temp.exclude : false,
+      time: temp ? temp.time : LocalTime.now().truncatedTo(minutes).toString(),
+      isTimePickerVisible: false,
+      outOfRange: null
+    }
+
     if (temp) {
-      initialValue = temp.value.toString()
-      this.time = temp.time
+      this.state.temperature = temp.value.toString()
+      if (temp.value === Math.floor(temp.value)) {
+        this.state.temperature = `${this.state.temperature}.0`
+      }
     } else {
       const prevTemp = getPreviousTemperature(this.cycleDay)
-      initialValue = prevTemp ? prevTemp.toString() : ''
+      if (prevTemp) {
+        this.state.temperature = prevTemp.toString()
+        this.state.isSuggestion = true
+      }
     }
+  }
 
-    this.state = {
-      currentValue: initialValue,
-      exclude: temp ? temp.exclude : false,
-      time: this.time || LocalTime.now().truncatedTo(MINUTES).toString(),
-      isTimePickerVisible: false
+  saveTemperature = () => {
+    const dataToSave = {
+      value: Number(this.state.temperature),
+      exclude: this.state.exclude,
+      time: this.state.time
     }
+    saveSymptom('temperature', this.cycleDay, dataToSave)
+    this.props.navigate('CycleDay', {cycleDay: this.cycleDay})
   }
 
+  checkRangeAndSave = () => {
+    const value = Number(this.state.temperature)
+
+    const absolute = {
+      min: config.temperatureScale.min,
+      max: config.temperatureScale.max
+    }
+    const scale = scaleObservable.value
+    let warningMsg
+    if (value < absolute.min || value > absolute.max) {
+      warningMsg = tempLabels.outOfAbsoluteRangeWarning
+    } else if (value < scale.min || value > scale.max) {
+      warningMsg = tempLabels.outOfRangeWarning
+    }
+
+    if (warningMsg) {
+      Alert.alert(
+        shared.warning,
+        warningMsg,
+        [
+          { text: shared.cancel },
+          { text: shared.save, onPress: this.saveTemperature}
+        ]
+      )
+    } else {
+      this.saveTemperature()
+    }
+
+  }
+
+
   render() {
     return (
       <View style={{ flex: 1 }}>
@@ -48,14 +98,10 @@ export default class Temp extends Component {
           <View>
             <View style={styles.symptomViewRowInline}>
               <Text style={styles.symptomDayView}>Temperature (°C)</Text>
-              <TextInput
-                style={styles.temperatureTextInput}
-                placeholder="Enter"
-                onChangeText={(val) => {
-                  this.setState({ currentValue: val })
-                }}
-                keyboardType='numeric'
-                value={this.state.currentValue}
+              <TempInput
+                value={this.state.temperature}
+                setState={(val) => this.setState(val)}
+                isSuggestion={this.state.isSuggestion}
               />
             </View>
             <View style={styles.symptomViewRowInline}>
@@ -94,22 +140,42 @@ export default class Temp extends Component {
         <ActionButtonFooter
           symptom='temperature'
           cycleDay={this.cycleDay}
-          saveAction={() => {
-            const dataToSave = {
-              value: Number(this.state.currentValue),
-              exclude: this.state.exclude,
-              time: this.state.time
-            }
-            saveSymptom('temperature', this.props.cycleDay, dataToSave)
-          }}
-          saveDisabled={this.state.currentValue === '' || isInvalidTime(this.state.time)}
+          saveAction={() => this.checkRangeAndSave()}
+          saveDisabled={
+            this.state.temperature === '' ||
+            isNaN(Number(this.state.temperature)) ||
+            isInvalidTime(this.state.time)
+          }
           navigate={this.props.navigate}
+          autoShowDayView={false}
         />
       </View>
     )
   }
 }
 
+class TempInput extends Component {
+  render() {
+    const style = [styles.temperatureTextInput]
+    if (this.props.isSuggestion) {
+      style.push(styles.temperatureTextInputSuggestion)
+    }
+    return (
+      <TextInput
+        style={style}
+        onChangeText={(val) => {
+          if (isNaN(Number(val))) return
+          this.props.setState({ temperature: val, isSuggestion: false })
+        }}
+        keyboardType='numeric'
+        value={this.props.value}
+        onBlur={this.checkRange}
+        autoFocus={true}
+      />
+    )
+  }
+}
+
 function isInvalidTime(timeString) {
   try {
     LocalTime.parse(timeString)
diff --git a/components/labels.js b/components/labels.js
index 96cdcf241570235a5449fc805458b92dc61e395e..c4391763e042be9417b576149f59cc6551888a8b 100644
--- a/components/labels.js
+++ b/components/labels.js
@@ -1,9 +1,12 @@
+export const shared = {
+  cancel: 'Cancel',
+  save: 'Save',
+  errorTitle: 'Error',
+  successTitle: 'Success',
+  warning: 'Warning'
+}
+
 export const settings = {
-  shared: {
-    cancel: 'Cancel',
-    errorTitle: 'Error',
-    successTitle: 'Success'
-  },
   export: {
     errors: {
       noData: 'There is no data to export',
@@ -13,6 +16,7 @@ export const settings = {
     title: 'My Drip data export',
     subject: 'My Drip data export',
     button: 'Export data',
+    segmentExplainer: 'Export data in CSV format for backup or so you can use it elsewhere'
   },
   import: {
     button: 'Import data',
@@ -28,7 +32,16 @@ export const settings = {
     },
     success: {
       message: 'Data successfully imported'
-    }
+    },
+    segmentExplainer: 'Import data in CSV format'
+  },
+  tempScale: {
+    segmentTitle: 'Temperature scale',
+    segmentExplainer: 'Change the minimum and maximum value for the temperature chart',
+    min: 'Min',
+    max: 'Max',
+    loadError: 'Could not load saved temperature scale settings',
+    saveError: 'Could not save temperature scale settings'
   }
 }
 
diff --git a/components/menu.js b/components/menu.js
index 8a5518774db8bfb2e15ba652c5af17ab2779ac1c..737203baf8c94e29834457cac0a7489f763408a7 100644
--- a/components/menu.js
+++ b/components/menu.js
@@ -8,7 +8,7 @@ import styles, { iconStyles } from '../styles'
 import Icon from 'react-native-vector-icons/MaterialCommunityIcons'
 
 export default class Menu extends Component {
-  makeMenuItem({ title, icon, onPress}, i) {
+  makeMenuItem = ({ title, icon, onPress}, i) => {
     return (
       <TouchableOpacity
         onPress={onPress}
@@ -36,7 +36,7 @@ export default class Menu extends Component {
           { title: 'Chart', icon: 'chart-line', onPress: () => this.goTo('Chart') },
           { title: 'Stats', icon: 'chart-pie', onPress: () => this.goTo('Stats') },
           { title: 'Settings', icon: 'settings', onPress: () => this.goTo('Settings') },
-        ].map(this.makeMenuItem.bind(this))}
+        ].map(this.makeMenuItem)}
       </View >
     )
   }
diff --git a/components/settings.js b/components/settings.js
index 97907b101cd7e527d4f351d5025fd93fe39adb42..f03aec91dc3dda283582677aad1b200a47b5aeae 100644
--- a/components/settings.js
+++ b/components/settings.js
@@ -1,80 +1,161 @@
 import React, { Component } from 'react'
 import {
   View,
-  Button,
+  TouchableOpacity,
   ScrollView,
-  Alert
+  Alert,
+  Text
 } from 'react-native'
-
+import Slider from '@ptomasroos/react-native-multi-slider'
 import Share from 'react-native-share'
 import { DocumentPicker, DocumentPickerUtil } from 'react-native-document-picker'
 import rnfs from 'react-native-fs'
-import styles from '../styles/index'
-import { settings as labels } from './labels'
+import styles, { secondaryColor } from '../styles/index'
+import config from '../config'
+import { settings as settingsLabels, shared as sharedLabels } from './labels'
 import getDataAsCsvDataUri from '../lib/import-export/export-to-csv'
 import importCsv from '../lib/import-export/import-from-csv'
+import { scaleObservable, saveTempScale } from '../local-storage'
 
 export default class Settings extends Component {
   render() {
     return (
       <ScrollView>
-        <View style={styles.homeButtons}>
-          <View style={styles.homeButton}>
-            <Button
-              onPress={ openShareDialogAndExport }
-              title={labels.export.button}>
-            </Button>
-          </View>
-          <View style={styles.homeButton}>
-            <Button
-              title={labels.import.button}
-              onPress={ openImportDialogAndImport }>
-            </Button>
-          </View>
+        <View style={styles.settingsSegment}>
+          <Text style={styles.settingsSegmentTitle}>
+            {settingsLabels.tempScale.segmentTitle}
+          </Text>
+          <Text>{settingsLabels.tempScale.segmentExplainer}</Text>
+          <TempSlider/>
+        </View>
+        <View style={styles.settingsSegment}>
+          <Text style={styles.settingsSegmentTitle}>
+            {settingsLabels.export.button}
+          </Text>
+          <Text>{settingsLabels.export.segmentExplainer}</Text>
+          <TouchableOpacity
+            onPress={openShareDialogAndExport}
+            style={styles.settingsButton}>
+            <Text style={styles.settingsButtonText}>
+              {settingsLabels.export.button}
+            </Text>
+          </TouchableOpacity>
+        </View>
+        <View style={styles.settingsSegment}>
+          <Text style={styles.settingsSegmentTitle}>
+            {settingsLabels.import.button}
+          </Text>
+          <Text>{settingsLabels.import.segmentExplainer}</Text>
+          <TouchableOpacity
+            onPress={openImportDialogAndImport}
+            style={styles.settingsButton}>
+            <Text style={styles.settingsButtonText}>
+              {settingsLabels.import.button}
+            </Text>
+          </TouchableOpacity>
         </View>
       </ScrollView>
     )
   }
 }
 
+class TempSlider extends Component {
+  constructor(props) {
+    super(props)
+    this.state = Object.assign({}, scaleObservable.value)
+  }
+
+  onValuesChange = (values) => {
+    this.setState({
+      min: values[0],
+      max: values[1]
+    })
+  }
+
+  onValuesChangeFinish = (values) => {
+    this.setState({
+      min: values[0],
+      max: values[1]
+    })
+    try {
+      saveTempScale(this.state)
+    } catch(err) {
+      alertError(settingsLabels.tempScale.saveError)
+    }
+  }
+
+  render() {
+    return (
+      <View style={{alignItems: 'center'}}>
+        <Text>{`${settingsLabels.tempScale.min} ${this.state.min}`}</Text>
+        <Text>{`${settingsLabels.tempScale.max} ${this.state.max}`}</Text>
+        <Slider
+          values={[this.state.min, this.state.max]}
+          min={config.temperatureScale.min}
+          max={config.temperatureScale.max}
+          step={0.5}
+          onValuesChange={this.onValuesChange}
+          onValuesChangeFinish={this.onValuesChangeFinish}
+          selectedStyle={{
+            backgroundColor: 'darkgrey',
+          }}
+          unselectedStyle={{
+            backgroundColor: 'silver',
+          }}
+          trackStyle={{
+            height:10,
+          }}
+          markerStyle={{
+            backgroundColor: secondaryColor,
+            height: 20,
+            width: 20,
+            borderRadius: 100,
+            marginTop: 10
+          }}
+        />
+      </View>
+    )
+  }
+}
+
 async function openShareDialogAndExport() {
   let data
   try {
     data = getDataAsCsvDataUri()
     if (!data) {
-      return alertError(labels.errors.noData)
+      return alertError(settingsLabels.errors.noData)
     }
   } catch (err) {
     console.error(err)
-    return alertError(labels.errors.couldNotConvert)
+    return alertError(settingsLabels.errors.couldNotConvert)
   }
 
   try {
     await Share.open({
-      title: labels.export.title,
+      title: settingsLabels.export.title,
       url: data,
-      subject: labels.export.subject,
+      subject: settingsLabels.export.subject,
       type: 'text/csv',
       showAppsToView: true
     })
   } catch (err) {
     console.error(err)
-    return alertError(labels.export.errors.problemSharing)
+    return alertError(settingsLabels.export.errors.problemSharing)
   }
 }
 
 function openImportDialogAndImport() {
   Alert.alert(
-    labels.import.title,
-    labels.import.message,
+    settingsLabels.import.title,
+    settingsLabels.import.message,
     [{
-      text: labels.import.replaceOption,
+      text: settingsLabels.import.replaceOption,
       onPress: () => getFileContentAndImport({ deleteExisting: false })
     }, {
-      text: labels.import.deleteOption,
+      text: settingsLabels.import.deleteOption,
       onPress: () => getFileContentAndImport({ deleteExisting: true })
     }, {
-      text: labels.shared.cancel, style: 'cancel', onPress: () => { }
+      text: sharedLabels.cancel, style: 'cancel', onPress: () => { }
     }]
   )
 }
@@ -99,22 +180,22 @@ async function getFileContentAndImport({ deleteExisting }) {
   try {
     fileContent = await rnfs.readFile(fileInfo.uri, 'utf8')
   } catch (err) {
-    return importError(labels.import.errors.couldNotOpenFile)
+    return importError(settingsLabels.import.errors.couldNotOpenFile)
   }
 
   try {
     await importCsv(fileContent, deleteExisting)
-    Alert.alert(labels.import.success.title, labels.import.success.message)
+    Alert.alert(sharedLabels.successTitle, settingsLabels.import.success.message)
   } catch(err) {
     importError(err.message)
   }
 }
 
 function alertError(msg) {
-  Alert.alert(labels.shared.errorTitle, msg)
+  Alert.alert(sharedLabels.errorTitle, msg)
 }
 
 function importError(msg) {
-  const postFixed = `${msg}\n\n${labels.import.errors.postFix}`
+  const postFixed = `${msg}\n\n${settingsLabels.import.errors.postFix}`
   alertError(postFixed)
-}
\ No newline at end of file
+}
diff --git a/config.js b/config.js
new file mode 100644
index 0000000000000000000000000000000000000000..772e8282121b76b3e8f1dff970b68f25c64d3a8d
--- /dev/null
+++ b/config.js
@@ -0,0 +1,18 @@
+const config = {
+  columnWidth: 25,
+  columnHeightPercentage: 0.84,
+  xAxisHeightPercentage: 0.08,
+  symptomRowHeightPercentage: 0.08,
+  temperatureScale: {
+    defaultLow: 35,
+    defaultHigh: 38,
+    min: 34,
+    max: 40,
+    units: 0.1,
+    verticalPadding: 0.03
+  }
+}
+
+config.columnMiddle = config.columnWidth / 2
+
+export default config
\ No newline at end of file
diff --git a/local-storage/index.js b/local-storage/index.js
new file mode 100644
index 0000000000000000000000000000000000000000..50d886fb6c9ada10b874a433dbe17359474f2a87
--- /dev/null
+++ b/local-storage/index.js
@@ -0,0 +1,26 @@
+import { AsyncStorage } from 'react-native'
+import Observable from 'obv'
+import config from '../config'
+
+export const scaleObservable = Observable()
+setTempScaleInitially()
+
+async function setTempScaleInitially() {
+  const result = await AsyncStorage.getItem('tempScale')
+  let value
+  if (result) {
+    value = JSON.parse(result)
+  } else {
+    value = {
+      min: config.temperatureScale.defaultLow,
+      max: config.temperatureScale.defaultHigh
+    }
+  }
+  scaleObservable.set(value)
+}
+
+export async function saveTempScale(scale) {
+  await AsyncStorage.setItem('tempScale', JSON.stringify(scale))
+  scaleObservable.set(scale)
+}
+
diff --git a/package-lock.json b/package-lock.json
index 3ab223e502b72d9cf3444be7897e22654866d3f6..11aa75ab7be7fb4d8a02cf377bf7d0b081c20544 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -723,6 +723,11 @@
         }
       }
     },
+    "@ptomasroos/react-native-multi-slider": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@ptomasroos/react-native-multi-slider/-/react-native-multi-slider-1.0.0.tgz",
+      "integrity": "sha512-NpX22rQLArg9widwMzGf7XsInTDf6mfY/D1XaDVjglNkVphj3NSN37+nF6MofArCxC++1P+jHv0SGWbmJQwy4g=="
+    },
     "abbrev": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
@@ -3745,11 +3750,13 @@
         },
         "balanced-match": {
           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
+          "optional": true,
           "requires": {
             "balanced-match": "1.0.0",
             "concat-map": "0.0.1"
@@ -3762,15 +3769,18 @@
         },
         "code-point-at": {
           "version": "1.1.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "concat-map": {
           "version": "0.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
@@ -3873,7 +3883,8 @@
         },
         "inherits": {
           "version": "2.0.3",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "ini": {
           "version": "1.3.5",
@@ -3883,6 +3894,7 @@
         "is-fullwidth-code-point": {
           "version": "1.0.0",
           "bundled": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "1.0.1"
           }
@@ -3895,17 +3907,20 @@
         "minimatch": {
           "version": "3.0.4",
           "bundled": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "1.1.11"
           }
         },
         "minimist": {
           "version": "0.0.8",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "minipass": {
           "version": "2.2.4",
           "bundled": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "5.1.1",
             "yallist": "3.0.2"
@@ -3922,6 +3937,7 @@
         "mkdirp": {
           "version": "0.5.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -3994,7 +4010,8 @@
         },
         "number-is-nan": {
           "version": "1.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "object-assign": {
           "version": "4.1.1",
@@ -4004,6 +4021,7 @@
         "once": {
           "version": "1.4.0",
           "bundled": true,
+          "optional": true,
           "requires": {
             "wrappy": "1.0.2"
           }
@@ -4109,6 +4127,7 @@
         "string-width": {
           "version": "1.0.2",
           "bundled": true,
+          "optional": true,
           "requires": {
             "code-point-at": "1.1.0",
             "is-fullwidth-code-point": "1.0.0",
@@ -6009,6 +6028,11 @@
         }
       }
     },
+    "obv": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/obv/-/obv-0.0.1.tgz",
+      "integrity": "sha1-yyNhBjQVNvDaxIFeBnCCIcrX+14="
+    },
     "on-finished": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/on-finished/-/on-finished-2.3.0.tgz",
diff --git a/package.json b/package.json
index 6ff1901c2e599b1eec0fbdc9b28fc376f3425dc5..2c492c51a618b2257a136bf069e9554ad20e37bc 100644
--- a/package.json
+++ b/package.json
@@ -8,13 +8,14 @@
   ],
   "scripts": {
     "start": "node node_modules/react-native/local-cli/cli.js start",
-    "android": "./node_modules/.bin/react-native run-android",
-    "log": "./node_modules/.bin/react-native log-android | grep -v 'Warning: isMounted(...) is deprecated'",
+    "android": "react-native run-android",
+    "log": "react-native log-android",
     "test": "mocha --recursive --require @babel/register test && npm run lint",
     "test-watch": "mocha --recursive --require @babel/register --watch test",
     "lint": "eslint components lib test"
   },
   "dependencies": {
+    "@ptomasroos/react-native-multi-slider": "^1.0.0",
     "assert": "^1.4.1",
     "csvtojson": "^2.0.8",
     "date-range": "0.0.2",
@@ -23,6 +24,7 @@
     "js-joda": "^1.8.2",
     "moment": "^2.22.1",
     "object-path": "^0.11.4",
+    "obv": "0.0.1",
     "react": "16.4.1",
     "react-native": "^0.56.0",
     "react-native-calendars": "^1.19.3",
@@ -46,5 +48,25 @@
     "eslint-plugin-react": "^7.8.2",
     "mocha": "^5.2.0",
     "react-test-renderer": "16.3.1"
-  }
+  },
+  "description": "A menstrual cycle tracking app that's open-source and leaves your data on your phone. Use it to track your menstrual cycle or for fertility awareness!",
+  "main": "index.js",
+  "directories": {
+    "lib": "lib",
+    "test": "test"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+ssh://git@gitlab.com/bloodyhealth/drip.git"
+  },
+  "keywords": [
+    "cycle-tracking",
+    "symptothermal"
+  ],
+  "author": "",
+  "license": "GPL-3.0-or-later",
+  "bugs": {
+    "url": "https://gitlab.com/bloodyhealth/drip/issues"
+  },
+  "homepage": "https://gitlab.com/bloodyhealth/drip#README"
 }
diff --git a/styles/index.js b/styles/index.js
index 6e14c9fc1fa692fc69de5832aff75037eccc4f80..406de7abddc38fd42041dfcf537bc973a0d3a165 100644
--- a/styles/index.js
+++ b/styles/index.js
@@ -92,16 +92,17 @@ export default StyleSheet.create({
   },
   header: {
     backgroundColor: primaryColor,
-    paddingVertical: 18,
     paddingHorizontal: 15,
     alignItems: 'center',
-    justifyContent: 'center'
+    justifyContent: 'center',
+    height: '10%'
   },
   menu: {
     backgroundColor: primaryColor,
     alignItems: 'center',
     justifyContent: 'space-between',
-    flexDirection: 'row'
+    flexDirection: 'row',
+    height: '12%'
   },
   menuItem: {
     alignItems: 'center',
@@ -116,7 +117,8 @@ export default StyleSheet.create({
   },
   headerCycleDay: {
     flexDirection: 'row',
-    justifyContent: 'space-between'
+    justifyContent: 'space-between',
+    height: '15%'
   },
   navigationArrow: {
     fontSize: 60,
@@ -129,9 +131,11 @@ export default StyleSheet.create({
     marginBottom: 15
   },
   temperatureTextInput: {
-    width: 80,
-    textAlign: 'center',
-    fontSize: 20
+    fontSize: 20,
+    color: 'black'
+  },
+  temperatureTextInputSuggestion: {
+    color: '#939393'
   },
   actionButtonRow: {
     flexDirection: 'row',
@@ -152,6 +156,23 @@ export default StyleSheet.create({
     textAlign: 'left',
     textAlignVertical: 'center'
   },
+  settingsSegment: {
+    backgroundColor: 'lightgrey',
+    padding: 10,
+    marginBottom: 10,
+  },
+  settingsSegmentTitle: {
+    fontWeight: 'bold'
+  },
+  settingsButton: {
+    backgroundColor: secondaryColor,
+    padding: 10,
+    alignItems: 'center',
+    margin: 10
+  },
+  settingsButtonText: {
+    color: fontOnPrimaryColor
+  },
   statsRow: {
     flexDirection: 'row',
     width: '100%'
diff --git a/test/cycle-length.spec.js b/test/cycle-length.spec.js
index 3714337a8b6ee27285200cf4a5f068d6ed94ae4f..fc0d451a2997ca06607ca48a84a750bb4284c475 100644
--- a/test/cycle-length.spec.js
+++ b/test/cycle-length.spec.js
@@ -17,7 +17,7 @@ describe('getCycleLengthStats', () => {
       stdDeviation: 53.06
     }
     expect(result).to.eql(expectedResult)
-  })
+  }),
 
   it('works for a simple even-numbered array', () => {
     const cycleLengths = [4, 1, 15, 2, 20, 5]
@@ -30,7 +30,8 @@ describe('getCycleLengthStats', () => {
       stdDeviation: 7.78
     }
     expect(result).to.eql(expectedResult)
-  })
+  }),
+
   it('works for an one-element array', () => {
     const cycleLengths = [42]
     const result = cycleInfo(cycleLengths)
@@ -42,20 +43,60 @@ describe('getCycleLengthStats', () => {
       stdDeviation: null
     }
     expect(result).to.eql(expectedResult)
+  }),
+
+  describe('works for more realistic examples', () => {
+    it('1 day difference between shortest and longest period', () => {
+      const cycleLengths = [28, 29, 28, 28, 28, 29, 28, 28, 28, 29, 29, 28]
+      const result = cycleInfo(cycleLengths)
+      const expectedResult = {
+        minimum: 28,
+        maximum: 29,
+        mean: 28.33,
+        median: 28,
+        stdDeviation: 0.49
+      }
+      expect(result).to.eql(expectedResult)
+    }),
+    it('3 days difference between shortest and longest period', () => {
+      const cycleLengths = [28, 29, 28, 28, 27, 30, 28, 27, 28, 28, 29, 27]
+      const result = cycleInfo(cycleLengths)
+      const expectedResult = {
+        minimum: 27,
+        maximum: 30,
+        mean: 28.08,
+        median: 28,
+        stdDeviation: 0.90
+      }
+      expect(result).to.eql(expectedResult)
+    }),
+    it('8 days difference between shortest and longest period', () => {
+      const cycleLengths = [28, 32, 29, 27, 28, 26, 33, 28, 29, 34, 27, 29]
+      const result = cycleInfo(cycleLengths)
+      const expectedResult = {
+        minimum: 26,
+        maximum: 34,
+        mean: 29.17,
+        median: 28.5,
+        stdDeviation: 2.52
+      }
+      expect(result).to.eql(expectedResult)
+    })
   })
+
   describe('when args are wrong', () => {
     it('throws when arg object is an empty array', () => {
       const cycleLengths = []
       expect(() => cycleInfo(cycleLengths).to.throw(AssertionError))
-    })
+    }),
     it('throws when arg object is not in right format', () => {
       const wrongObject = { hello: 'world' }
       expect(() => cycleInfo(wrongObject).to.throw(AssertionError))
-    })
+    }),
     it('throws when arg array contains a string', () => {
       const wrongElement = [4, 1, 15, '2', 20, 5]
       expect(() => cycleInfo(wrongElement).to.throw(AssertionError))
-    })
+    }),
     it('throws when arg array contains a NaN', () => {
       const wrongElement = [4, 1, 15, NaN, 20, 5]
       expect(() => cycleInfo(wrongElement).to.throw(AssertionError))
diff --git a/test/cycle.spec.js b/test/cycle.spec.js
index 2cbbab921f7058e3482712a10a8c4c47f115a202..c73b757037c16b64d0ae5ae2c42d3f32186a79a9 100644
--- a/test/cycle.spec.js
+++ b/test/cycle.spec.js
@@ -583,4 +583,83 @@ describe('getPredictedMenses', () => {
       expect(result).to.eql(expectedResult)
     })
   })
+})
+
+describe('getAllMensesStart', () => {
+  it('works for one cycle start', () => {
+    const cycleDaysSortedByDate = [
+      {
+        date: '2018-05-01',
+        bleeding: { value: 1 }
+      }
+    ]
+
+    const { getAllMensesStarts } = cycleModule({
+      cycleDaysSortedByDate,
+      bleedingDaysSortedByDate: cycleDaysSortedByDate.filter(d => d.bleeding)
+    })
+    const result = getAllMensesStarts()
+    expect(result.length).to.eql(1)
+    expect(result).to.eql(['2018-05-01'])
+  }),
+  it('works for two cycle starts', () => {
+    const cycleDaysSortedByDate = [
+      {
+        date: '2018-06-02',
+        bleeding: { value: 2 }
+      },
+      {
+        date: '2018-06-01',
+        bleeding: { value: 2 }
+      },
+      {
+        date: '2018-05-01',
+        bleeding: { value: 2 }
+      }
+    ]
+
+    const { getAllMensesStarts } = cycleModule({
+      cycleDaysSortedByDate,
+      bleedingDaysSortedByDate: cycleDaysSortedByDate.filter(d => d.bleeding)
+    })
+    const result = getAllMensesStarts()
+    expect(result.length).to.eql(2)
+    expect(result).to.eql(['2018-06-01', '2018-05-01'])
+  }),
+  it('works for two cycle starts with excluded data', () => {
+    const cycleDaysSortedByDate = [
+      {
+        date: '2018-06-01',
+        bleeding: { value: 2 }
+      },
+      {
+        date: '2018-05-01',
+        bleeding: { value: 2 }
+      },
+      {
+        date: '2018-04-31',
+        bleeding: { value: 2 , exclude: true}
+      },
+    ]
+
+    const { getAllMensesStarts } = cycleModule({
+      cycleDaysSortedByDate,
+      bleedingDaysSortedByDate: cycleDaysSortedByDate.filter(d => d.bleeding)
+    })
+    const result = getAllMensesStarts()
+    expect(result.length).to.eql(2)
+    expect(result).to.eql(['2018-06-01', '2018-05-01'])
+  }),
+  it('returns an empty array if no bleeding days are given', () => {
+    const cycleDaysSortedByDate = [ {} ]
+
+    const { getAllMensesStarts } = cycleModule({
+      cycleDaysSortedByDate,
+      bleedingDaysSortedByDate: cycleDaysSortedByDate.filter(d => d.bleeding)
+    })
+    const result = getAllMensesStarts()
+    expect(result.length).to.eql(0)
+    expect(result).to.eql([])
+>>>>>>> test/cycle.spec.js
+  })
 })
\ No newline at end of file