diff --git a/apps.json b/apps.json
index 7073c3f81..e1766d311 100644
--- a/apps.json
+++ b/apps.json
@@ -3074,5 +3074,20 @@
     {"name":"waypoints.json","url":"waypoints.json","evaluate":false},
     {"name":"kitchen.img","url":"kitchen.icon.js","evaluate":true}
   ]
-}  
+},
+{
+  "id": "hourstrike",
+  "name": "Hour Strike",
+  "shortName": "Hour Strike",
+  "icon": "app-icon.png",
+  "version": "0.07",
+  "description": "Strike the clock on the hour. A great tool to remind you an hour has passed!",
+  "tags": "tool,alarm",
+  "readme": "README.md",
+  "storage": [
+    {"name":"hourstrike.app.js","url":"app.js"},
+    {"name":"hourstrike.boot.js","url":"boot.js"},
+    {"name":"hourstrike.img","url":"app-icon.js","evaluate":true}
+  ]
+}
 ]
diff --git a/apps/hourstrike/ChangeLog b/apps/hourstrike/ChangeLog
new file mode 100644
index 000000000..73b8cb168
--- /dev/null
+++ b/apps/hourstrike/ChangeLog
@@ -0,0 +1,7 @@
+0.01: New App
+0.02: Add different strike intervals and support for quiet time
+0.03: Bug fixes for setting attributes
+0.04: Add more time to strike and the strength
+0.05: Add display for the next strike time
+0.06: Move the next strike time to the first row of display
+0.07: Change the boot function to avoid reloading the entire watch
diff --git a/apps/hourstrike/README.md b/apps/hourstrike/README.md
new file mode 100644
index 000000000..67a131f8a
--- /dev/null
+++ b/apps/hourstrike/README.md
@@ -0,0 +1,25 @@
+# Hour Strike
+
+![icon](app-icon.png)
+
+Time passes too fast!
+
+This app configures your `Bangle.js` so that it buzzes on the hour or on the half hour.
+
+This app is slightly different from [Hour Chime](https://github.com/espruino/BangleApps/tree/master/apps/widchime). `Hour Chimee` runs as a widget but `Hour Strike` runs as a background task, without showing a widget.
+
+## Features
+
+- Strike the hour, the half hour, the quarter hour, and more
+- Set up a range of hours that clock will strike
+- Set up the strength of the strike
+- Preview when the next strike will happen
+
+## Known Issues
+
+- This app does not know or check whether your clock already chimes on the hour.
+
+## Creator
+
+[Weiming Hu](https://weiming-hu.github.io/), using coding from the [Default Alarm](https://github.com/espruino/BangleApps/tree/master/apps/alarm).
+
diff --git a/apps/hourstrike/app-icon.js b/apps/hourstrike/app-icon.js
new file mode 100644
index 000000000..7f2040745
--- /dev/null
+++ b/apps/hourstrike/app-icon.js
@@ -0,0 +1 @@
+require("heatshrink").decompress(atob("mEwwkGswAHogAEBxAAHsgXFowXPCwowQFwwwQCIUjn/zmQwPFwUj/4ACDAQwMBwNDCgPwh4DBmgwMFwU/C4vzGBgMBoRECC4f/kgwLIwgXFJBgLBl4XH+QXNLwQXFMAQXPmEDC6K8DiEBAoYXSgA1DI6MxgETL6gYBgIGBC5ynDCYMQAwKnOa4YABmTXQoQXEAAUkC5dkMAx2EowXJJBBGNAAMUBwMjMAgHBoIXLiIPBDAM/+YWCokRC5gwCAAtBC5owDAAgJBC5dBiAwGoMBigXLokQgIXFA4QXMoEAAANNqAECggXR7oXXAYQXSgvUC6sEC60N6oXW6AXUinu8IXTgPuAAMQC6UEC4SsDC58OC4XgC9RHXO66nCoLXVAAoXmABQX1A"))
diff --git a/apps/hourstrike/app-icon.png b/apps/hourstrike/app-icon.png
new file mode 100644
index 000000000..f7ca232cf
Binary files /dev/null and b/apps/hourstrike/app-icon.png differ
diff --git a/apps/hourstrike/app.js b/apps/hourstrike/app.js
new file mode 100644
index 000000000..c70fa2d41
--- /dev/null
+++ b/apps/hourstrike/app.js
@@ -0,0 +1,48 @@
+const storage = require('Storage');
+let settings;
+
+function updateSettings() {
+  storage.write('hourstrike.json', settings);
+}
+
+function resetSettings() {
+  settings = {
+    interval: 3600,
+    start: 9,
+    end: 21,
+    vlevel: 0.5,
+    next_hour: -1,
+    next_minute: -1,
+  };
+  updateSettings();
+}
+
+settings = storage.readJSON('hourstrike.json', 1);
+if (!settings) resetSettings();
+
+function showMainMenu() {
+  var mode_txt = ['Off','1 min','5 min','10 min','1/4 h','1/2 h','1 h'];
+  var mode_interval = [-1,60,300,600,900,1800,3600];
+  const mainmenu = {'': { 'title': 'Hour Strike' }};
+  mainmenu['Next strike '+settings.next_hour+':'+settings.next_minute] = function(){};
+  mainmenu['Notify every'] = {
+    value: mode_interval.indexOf(settings.interval),
+    min: 0, max: 6, format: v => mode_txt[v],
+    onchange: v => {
+      settings.interval = mode_interval[v];
+      if (v===0) {settings.next_hour = -1; settings.next_minute = -1;}
+      updateSettings();}};
+  mainmenu.Start = {
+    value: settings.start, min: 0, max: 23, format: v=>v+':00',
+    onchange: v=> {settings.start = v; updateSettings();}};
+  mainmenu.End = {
+    value: settings.end, min: 0, max: 23, format: v=>v+':59',
+    onchange: v=> {settings.end = v; updateSettings();}};
+  mainmenu.Strength = {
+    value: settings.vlevel*10, min: 1, max: 10, format: v=>v/10,
+    onchange: v=> {settings.vlevel = v/10; updateSettings();}};
+  mainmenu['< Back'] = ()=>load();
+  return E.showMenu(mainmenu);
+}
+
+showMainMenu();
diff --git a/apps/hourstrike/boot.js b/apps/hourstrike/boot.js
new file mode 100644
index 000000000..8ddad31af
--- /dev/null
+++ b/apps/hourstrike/boot.js
@@ -0,0 +1,39 @@
+(function() {
+  function setup () {
+    var settings = require('Storage').readJSON('hourstrike.json',1)||[];
+    var t = new Date();
+    var t_min_sec = t.getMinutes()*60+t.getSeconds();
+    var wait_msec = settings.interval>0?(settings.interval-t_min_sec%settings.interval)*1000:-1;
+    if (wait_msec>0) {
+      t.setMilliseconds(t.getMilliseconds()+wait_msec);
+      var t_hour = t.getHours();
+      if (t_hour<settings.start||t_hour>settings.end) {
+        var strike = new Date(t.getTime());
+        strike.setHours(settings.start);
+        strike.setMinutes(0);
+        if (t_hour>settings.end) {
+          strike.setDate(strike.getDate()+1);
+        }
+        wait_msec += strike-t;
+        settings.next_hour = strike.getHours();
+        settings.next_minute = strike.getMinutes();
+      } else {
+        settings.next_hour = t_hour;
+        settings.next_minute = t.getMinutes();
+      }
+      setTimeout(strike_func, wait_msec);
+    } else {
+      settings.next_hour = -1;
+      settings.next_minute = -1;
+    }
+    require('Storage').write('hourstrike.json', settings);
+  }
+  function strike_func () {
+    var setting = require('Storage').readJSON('hourstrike.json',1)||[];
+    Bangle.buzz(200, setting.vlevel||0.5)
+      .then(() => new Promise(resolve => setTimeout(resolve,200)))
+      .then(() => Bangle.buzz(200, setting.vlevel||0.5));
+    setup();
+  }
+  setup();
+})();