diff --git a/apps/activityreminder/ChangeLog b/apps/activityreminder/ChangeLog
index ef387d098..d4b5100a2 100644
--- a/apps/activityreminder/ChangeLog
+++ b/apps/activityreminder/ChangeLog
@@ -2,3 +2,4 @@
 0.02: Fix the settings bug and some tweaking
 0.03: Do not alarm while charging
 0.04: Obey system quiet mode
+0.05: Battery optimisation, add the pause option, bug fixes
diff --git a/apps/activityreminder/README.md b/apps/activityreminder/README.md
index e8be66f3c..25e2c8d35 100644
--- a/apps/activityreminder/README.md
+++ b/apps/activityreminder/README.md
@@ -7,8 +7,8 @@ Different settings can be personalized:
 - Enable : Enable/Disable the app
 - Start hour: Hour to start the reminder
 - End hour: Hour to end the reminder
-- Max inactivity: Maximum inactivity time to allow before the alert. From 15 to 60 min
+- Max inactivity: Maximum inactivity time to allow before the alert. From 15 to 120 min
 - Dismiss delay: Delay added before the next alert if the alert is dismissed. From 5 to 60 min
-    Notice: If Dissmiss delay > Max inactivity then it will be equal Max inactivity
+- Pause delay: Same as Dismiss delay but longer (usefull for meetings and such). From 30 to 240 min
 - Min steps: Minimal amount of steps to count as an activity
 
diff --git a/apps/activityreminder/app.js b/apps/activityreminder/app.js
index 811399ca6..f3d72976e 100644
--- a/apps/activityreminder/app.js
+++ b/apps/activityreminder/app.js
@@ -1,40 +1,42 @@
-function drawAlert(){
-  E.showPrompt("Inactivity detected",{
-    title:"Activity reminder",
-    buttons : {"Ok": true,"Dismiss": false}
-    }).then(function(v) {
-      if(v == true){
-        stepsArray = stepsArray.slice(0, activityreminder.maxInnactivityMin - 3);
-        require("activityreminder").saveStepsArray(stepsArray);
-      }
-      if(v == false){
-        stepsArray = stepsArray.slice(0, activityreminder.maxInnactivityMin - activityreminder.dismissDelayMin);
-        require("activityreminder").saveStepsArray(stepsArray);
-      }
+function drawAlert() {
+  E.showPrompt("Inactivity detected", {
+    title: "Activity reminder",
+    buttons: { "Ok": 1, "Dismiss": 2, "Pause": 3 }
+  }).then(function (v) {
+    if (v == 1) {
+      activityreminder_data.okDate = new Date();
+    }
+    if (v == 2) {
+      activityreminder_data.dismissDate = new Date();
+    }
+    if (v == 3) {
+      activityreminder_data.pauseDate = new Date();
+    }
+    activityreminder.saveData(activityreminder_data);
     load();
   });
 
   // Obey system quiet mode:
-  if (!(require('Storage').readJSON('setting.json',1)||{}).quiet) {
+  if (!(storage.readJSON('setting.json', 1) || {}).quiet) {
     Bangle.buzz(400);
   }
   setTimeout(load, 20000);
 }
 
-function run(){
-    if(stepsArray.length == activityreminder.maxInnactivityMin){
-        if (stepsArray[0] - stepsArray[stepsArray.length-1] < activityreminder.minSteps){
-            drawAlert();
-        }
-    }else{
-        eval(require("Storage").read("activityreminder.settings.js"))(()=>load());
-    }
+function run() {
+  if (activityreminder.mustAlert(activityreminder_data, activityreminder_settings)) {
+    drawAlert();
+  } else {
+    eval(storage.read("activityreminder.settings.js"))(() => load());
+  }
 }
 
 
+const activityreminder = require("activityreminder");
+const storage = require("Storage");
 g.clear();
 Bangle.loadWidgets();
 Bangle.drawWidgets();
-activityreminder = require("activityreminder").loadSettings();
-stepsArray = require("activityreminder").loadStepsArray();
+const activityreminder_settings = activityreminder.loadSettings();
+const activityreminder_data = activityreminder.loadData();
 run();
diff --git a/apps/activityreminder/boot.js b/apps/activityreminder/boot.js
index 09aa9d757..7c094f521 100644
--- a/apps/activityreminder/boot.js
+++ b/apps/activityreminder/boot.js
@@ -1,30 +1,45 @@
-function run(){
-    if (Bangle.isCharging()) return;
-    var now = new Date();
-    var h = now.getHours();
-    if(h >= activityreminder.startHour && h < activityreminder.endHour){
-        var health = Bangle.getHealthStatus("day");
-        stepsArray.unshift(health.steps);
-        stepsArray = stepsArray.slice(0, activityreminder.maxInnactivityMin);
-        require("activityreminder").saveStepsArray(stepsArray);
-    }
-    else{
-        if(stepsArray != []){
-            stepsArray = [];
-            require("activityreminder").saveStepsArray(stepsArray);
+function run() {
+    if (isNotWorn()) return;
+    let now = new Date();
+    let h = now.getHours();
+    let health = Bangle.getHealthStatus("day");
+
+    if (h >= activityreminder_settings.startHour && h < activityreminder_settings.endHour) {
+        if (health.steps - activityreminder_data.stepsOnDate >= activityreminder_settings.minSteps // more steps made than needed
+            || health.steps < activityreminder_data.stepsOnDate) { // new day or reboot of the watch
+            activityreminder_data.stepsOnDate = health.steps;
+            activityreminder_data.stepsDate = now;
+            activityreminder.saveData(activityreminder_data);
+            /* todo in a futur release 
+            add settimer to trigger like 10 secs after the stepsDate + minSteps
+            cancel all other timers of this app
+            */
         }
-    }
-    if(stepsArray.length >= activityreminder.maxInnactivityMin){
-        if (stepsArray[0] - stepsArray[stepsArray.length-1] < activityreminder.minSteps){
+        
+        if(activityreminder.mustAlert(activityreminder_data, activityreminder_settings)){
             load('activityreminder.app.js');
         }
     }
+
 }
 
+function isNotWorn() {
+    // todo in a futur release check temperature and mouvement in a futur release 
+    return Bangle.isCharging();
+}
 
-activityreminder = require("activityreminder").loadSettings();
-if(activityreminder.enabled) {
-    stepsArray = require("activityreminder").loadStepsArray();
+const activityreminder = require("activityreminder");
+const activityreminder_settings = activityreminder.loadSettings();
+if (activityreminder_settings.enabled) {
+    const activityreminder_data = activityreminder.loadData();
+    if(activityreminder_data.firstLoad){
+        activityreminder_data.firstLoad =false;
+        activityreminder.saveData(activityreminder_data);
+    }
     setInterval(run, 60000);
+    /* todo in a futur release 
+    increase setInterval time to something that is still sensible (5 mins ?)
+    add settimer to trigger like 10 secs after the stepsDate + minSteps
+    cancel all other timers of this app
+    */
 }
-
diff --git a/apps/activityreminder/lib.js b/apps/activityreminder/lib.js
index 712842fba..5b7959827 100644
--- a/apps/activityreminder/lib.js
+++ b/apps/activityreminder/lib.js
@@ -1,22 +1,57 @@
-exports.loadSettings = function() {
+const storage = require("Storage");
+
+exports.loadSettings = function () {
     return Object.assign({
         enabled: true,
         startHour: 9,
         endHour: 20,
         maxInnactivityMin: 30,
         dismissDelayMin: 15,
+        pauseDelayMin: 120,
         minSteps: 50
-    }, require("Storage").readJSON("activityreminder.s.json", true) || {});
+    }, storage.readJSON("activityreminder.s.json", true) || {});
 };
 
-exports.writeSettings = function(settings){
-    require("Storage").writeJSON("activityreminder.s.json", settings);
+exports.writeSettings = function (settings) {
+    storage.writeJSON("activityreminder.s.json", settings);
 };
 
-exports.saveStepsArray = function(stepsArray) {
-    require("Storage").writeJSON("activityreminder.sa.json", stepsArray);
+exports.saveData = function (data) {
+    storage.writeJSON("activityreminder.data.json", data);
 };
 
-exports.loadStepsArray = function(){
-    return require("Storage").readJSON("activityreminder.sa.json") || [];
-};
\ No newline at end of file
+exports.loadData = function () {
+    let health = Bangle.getHealthStatus("day");
+    const data = Object.assign({
+        firstLoad: true,
+        stepsDate: new Date(),
+        stepsOnDate: health.steps,
+        okDate: new Date(1970),
+        dismissDate: new Date(1970),
+        pauseDate: new Date(1970),
+    },
+    storage.readJSON("activityreminder.data.json") || {});
+
+    if(typeof(data.stepsDate) == "string")
+        data.stepsDate = new Date(data.stepsDate);
+    if(typeof(data.okDate) == "string")
+        data.okDate = new Date(data.okDate);
+    if(typeof(data.dismissDate) == "string")
+        data.dismissDate = new Date(data.dismissDate);
+    if(typeof(data.pauseDate) == "string")
+        data.pauseDate = new Date(data.pauseDate);
+
+    return data;
+};
+
+exports.mustAlert = function(activityreminder_data, activityreminder_settings) {
+    let now = new Date();
+    if ((now - activityreminder_data.stepsDate) / 60000 > activityreminder_settings.maxInnactivityMin) { // inactivity detected
+        if ((now - activityreminder_data.okDate) / 60000 > 3 && // last alert anwsered with ok was more than 3 min ago
+            (now - activityreminder_data.dismissDate) / 60000 > activityreminder_settings.dismissDelayMin && // last alert was more than dismissDelayMin ago
+            (now - activityreminder_data.pauseDate) / 60000 > activityreminder_settings.pauseDelayMin) { // last alert was more than pauseDelayMin ago
+            return true;
+        }
+    }
+    return false;
+}
\ No newline at end of file
diff --git a/apps/activityreminder/metadata.json b/apps/activityreminder/metadata.json
index 89b0fbc0b..15f10f2ed 100644
--- a/apps/activityreminder/metadata.json
+++ b/apps/activityreminder/metadata.json
@@ -3,7 +3,7 @@
   "name": "Activity Reminder",
   "shortName":"Activity Reminder",
   "description": "A reminder to take short walks for the ones with a sedentary lifestyle",
-  "version":"0.04",
+  "version":"0.05",
   "icon": "app.png",
   "type": "app",
   "tags": "tool,activity",
@@ -18,6 +18,6 @@
   ],
   "data": [
     {"name": "activityreminder.s.json"},
-    {"name":  "activityreminder.sa.json"}
+    {"name": "activityreminder.data.json"}
   ]
 }
diff --git a/apps/activityreminder/settings.js b/apps/activityreminder/settings.js
index e4f44efc6..9dff61f48 100644
--- a/apps/activityreminder/settings.js
+++ b/apps/activityreminder/settings.js
@@ -1,64 +1,76 @@
-(function(back) {
+(function (back) {
   // Load settings
-  var settings = require("activityreminder").loadSettings();
+  const activityreminder = require("activityreminder");
+  const settings = activityreminder.loadSettings();
 
   // Show the menu
   E.showMenu({
-      "" : { "title" : "Activity Reminder" },
-      "< Back" : () => back(),
-      'Enable': {
-        value: settings.enabled,
-        format: v => v?"Yes":"No",
-        onchange: v => {
-          settings.enabled = v;
-          require("activityreminder").writeSettings(settings);
-        }
+    "": { "title": "Activity Reminder" },
+    "< Back": () => back(),
+    'Enable': {
+      value: settings.enabled,
+      format: v => v ? "Yes" : "No",
+      onchange: v => {
+        settings.enabled = v;
+        activityreminder.writeSettings(settings);
+      }
+    },
+    'Start hour': {
+      value: settings.startHour,
+      min: 0, max: 24,
+      onchange: v => {
+        settings.startHour = v;
+        activityreminder.writeSettings(settings);
+      }
+    },
+    'End hour': {
+      value: settings.endHour,
+      min: 0, max: 24,
+      onchange: v => {
+        settings.endHour = v;
+        activityreminder.writeSettings(settings);
+      }
+    },
+    'Max inactivity': {
+      value: settings.maxInnactivityMin,
+      min: 15, max: 120,
+      onchange: v => {
+        settings.maxInnactivityMin = v;
+        activityreminder.writeSettings(settings);
       },
-      'Start hour': {
-        value: settings.startHour,
-        min: 0, max: 24,
-        onchange: v => {
-          settings.startHour = v;
-          require("activityreminder").writeSettings(settings);
-        }
-     },
-     'End hour': {
-        value: settings.endHour,
-        min: 0, max: 24,
-        onchange: v => {
-          settings.endHour = v;
-          require("activityreminder").writeSettings(settings);
-        }
-     },
-     'Max inactivity': {
-        value: settings.maxInnactivityMin,
-        min: 15, max: 120,
-        onchange: v => {
-          settings.maxInnactivityMin = v;
-          require("activityreminder").writeSettings(settings);
-        },
-        format: x => {
-          return x + " min";
-        }
-     },
-     'Dismiss delay': {
-        value: settings.dismissDelayMin,
-        min: 5, max: 60,
-        onchange: v => {
-          settings.dismissDelayMin = v;
-          require("activityreminder").writeSettings(settings);
-        },
-        format: x => {
-          return x + " min";
-        }
-     },
-     'Min steps': {
-        value: settings.minSteps,
-        min: 10, max: 500,
-        onchange: v => {
-          settings.minSteps = v;
-          require("activityreminder").writeSettings(settings);
-        }
-     }
+      format: x => {
+        return x + " min";
+      }
+    },
+    'Dismiss delay': {
+      value: settings.dismissDelayMin,
+      min: 5, max: 60,
+      onchange: v => {
+        settings.dismissDelayMin = v;
+        activityreminder.writeSettings(settings);
+      },
+      format: x => {
+        return x + " min";
+      }
+    },
+    'Pause delay': {
+      value: settings.pauseDelayMin,
+      min: 30, max: 240,
+      onchange: v => {
+        settings.pauseDelayMin = v;
+        activityreminder.writeSettings(settings);
+      },
+      format: x => {
+        return x + " min";
+      }
+    },
+    'Min steps': {
+      value: settings.minSteps,
+      min: 10, max: 500,
+      onchange: v => {
+        settings.minSteps = v;
+        activityreminder.writeSettings(settings);
+      }
+    }
   });
 })
diff --git a/apps/calibration/README.md b/apps/calibration/README.md
new file mode 100644
index 000000000..37f637d21
--- /dev/null
+++ b/apps/calibration/README.md
@@ -0,0 +1,11 @@
+# Banglejs - Touchscreen calibration
+A simple calibration app for the touchscreen
+
+## Usage
+
+Once lauched touch the cross that appear on the screen to make
+another spawn elsewhere.
+
+each new touch on the screen will help to calibrate the offset
+of your finger on the screen. After five or more input, press
+the button to save the calibration and close the application.
\ No newline at end of file
diff --git a/apps/calibration/app-icon.js b/apps/calibration/app-icon.js
new file mode 100644
index 000000000..af66c3f68
--- /dev/null
+++ b/apps/calibration/app-icon.js
@@ -0,0 +1 @@
+require("heatshrink").decompress(atob("mEwwkB/4AJ+EPBhQXg+BBDCyJaGGR5zIDBoQEL4QYOLYR3GBIouJR5AYBGBILBU5QMGFwgiFX4wwIEI4XGGBAgHd44+HD44XHNw4XWM5IIHCIoXWV5IXICQgXvLxAAKCYYXh5nMC6n8C4PPC5MAAA8PC4ZxBACAXOI653hU5zvJABASEC5PwHI4XcMBIXICIoXXJBAXHCAwXXJBAXHB5AfGC4ygJEAwXGQ5BoIQxoiDBYgXECwIuIBgb5ECIQJFGBQmCC4QHEDBwAFCxoYICx5ZELZoZJFiIXpA="))
\ No newline at end of file
diff --git a/apps/calibration/app.js b/apps/calibration/app.js
new file mode 100644
index 000000000..d3823de63
--- /dev/null
+++ b/apps/calibration/app.js
@@ -0,0 +1,85 @@
+class BanglejsApp {
+  constructor() {
+    this.x = 0;
+    this.y = 0;
+    this.settings = {
+      xoffset: 0,
+      yoffset: 0,
+      };
+  }
+
+  load_settings() {
+    let settings = require('Storage').readJSON('calibration.json', true) || {active: false};
+
+    // do nothing if the calibration is deactivated
+    if (settings.active === true) {
+      // cancel the calibration offset 
+      Bangle.on('touch', function(button, xy) {
+        xy.x += settings.xoffset;
+        xy.y += settings.yoffset;
+      });
+    }
+    if (!settings.xoffset) settings.xoffset = 0;
+    if (!settings.yoffset) settings.yoffset = 0;
+
+    console.log('loaded settings:');
+    console.log(settings);
+
+    return settings;
+  }
+
+  save_settings() {
+    this.settings.active = true;
+    this.settings.reload = false;
+    require('Storage').writeJSON('calibration.json', this.settings);
+
+    console.log('saved settings:');
+    console.log(this.settings);
+  }
+
+  explain() {
+    /*
+    * TODO:
+    * Present how to use the application
+    *
+    */
+  }
+
+  drawTarget() {
+    this.x = 16 + Math.floor(Math.random() * (g.getWidth() - 32));
+    this.y = 40 + Math.floor(Math.random() * (g.getHeight() - 80));
+
+    g.clearRect(0, 24, g.getWidth(), g.getHeight() - 24);
+    g.drawLine(this.x, this.y - 5, this.x, this.y + 5);
+    g.drawLine(this.x - 5, this.y, this.x + 5, this.y);
+    g.setFont('Vector', 10);
+    g.drawString('current offset: ' + this.settings.xoffset + ', ' + this.settings.yoffset, 0, 24);
+  }
+
+  setOffset(xy) {
+    this.settings.xoffset = Math.round((this.settings.xoffset + (this.x - Math.floor((this.x + xy.x)/2)))/2);
+    this.settings.yoffset = Math.round((this.settings.yoffset + (this.y - Math.floor((this.y + xy.y)/2)))/2);
+  }
+}
+
+
+E.srand(Date.now());
+Bangle.loadWidgets();
+Bangle.drawWidgets();
+
+calibration = new BanglejsApp();
+calibration.load_settings();
+
+let modes = {
+  mode  : 'custom',
+  btn   : function(n) {
+    calibration.save_settings(this.settings);
+    load();
+  },
+  touch : function(btn, xy) {
+    calibration.setOffset(xy);
+    calibration.drawTarget();
+  },
+};
+Bangle.setUI(modes);
+calibration.drawTarget();
diff --git a/apps/calibration/boot.js b/apps/calibration/boot.js
new file mode 100644
index 000000000..237fb2e0d
--- /dev/null
+++ b/apps/calibration/boot.js
@@ -0,0 +1,14 @@
+let cal_settings = require('Storage').readJSON("calibration.json", true) || {active: false};
+Bangle.on('touch', function(button, xy) {
+  // do nothing if the calibration is deactivated
+  if (cal_settings.active === false) return;
+
+  // reload the calibration offset at each touch event /!\ bad for the flash memory
+  if (cal_settings.reload === true) {
+    cal_settings = require('Storage').readJSON("calibration.json", true);
+  }
+
+  // apply the calibration offset
+  xy.x += cal_settings.xoffset;
+  xy.y += cal_settings.yoffset;
+});
diff --git a/apps/calibration/calibration.png b/apps/calibration/calibration.png
new file mode 100644
index 000000000..3fb44beee
Binary files /dev/null and b/apps/calibration/calibration.png differ
diff --git a/apps/calibration/metadata.json b/apps/calibration/metadata.json
new file mode 100644
index 000000000..122a2c175
--- /dev/null
+++ b/apps/calibration/metadata.json
@@ -0,0 +1,17 @@
+{ "id": "calibration",
+  "name": "Touchscreen Calibration",
+  "shortName":"Calibration",
+  "icon": "calibration.png",
+  "version":"1.00",
+  "description": "A simple calibration app for the touchscreen",
+  "supports": ["BANGLEJS","BANGLEJS2"],
+  "readme": "README.md",
+  "tags": "tool",
+  "storage": [
+    {"name":"calibration.app.js","url":"app.js"},
+    {"name":"calibration.boot.js","url":"boot.js"},
+    {"name":"calibration.settings.js","url":"settings.js"},
+    {"name":"calibration.img","url":"app-icon.js","evaluate":true}
+  ],
+  "data": [{"name":"calibration.json"}]
+}
diff --git a/apps/calibration/settings.js b/apps/calibration/settings.js
new file mode 100644
index 000000000..6db8dd3bb
--- /dev/null
+++ b/apps/calibration/settings.js
@@ -0,0 +1,23 @@
+(function(back) {
+  var FILE = "calibration.json";
+  var settings = Object.assign({
+    active: true,
+  }, require('Storage').readJSON(FILE, true) || {});
+
+  function writeSettings() {
+    require('Storage').writeJSON(FILE, settings);
+  }
+
+  E.showMenu({
+    "" : { "title" : "Calibration" },
+    "< Back" : () => back(),
+    'Active': {
+      value: !!settings.active,
+      format: v => v? "On":"Off",
+      onchange: v => {
+        settings.active = v;
+        writeSettings();
+      }
+    },
+  });
+})
\ No newline at end of file