diff --git a/apps.json b/apps.json
index 19fa93262..d902a9054 100644
--- a/apps.json
+++ b/apps.json
@@ -3059,5 +3059,20 @@
     {"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.png",
+  "version": "0.01",
+  "description": "Strike the clock on the hour. A great tool to remind you an hour has passed!",
+  "tags": "tool,alarm,widget",
+  "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..5560f00bc
--- /dev/null
+++ b/apps/hourstrike/ChangeLog
@@ -0,0 +1 @@
+0.01: New App!
diff --git a/apps/hourstrike/READMS.md b/apps/hourstrike/READMS.md
new file mode 100644
index 000000000..64423695d
--- /dev/null
+++ b/apps/hourstrike/READMS.md
@@ -0,0 +1,17 @@
+# 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.
+
+## Features
+
+- Strikes the hour or the half hour
+- Set up a quiet time
+
+## 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..4e39d689e
--- /dev/null
+++ b/apps/hourstrike/app.js
@@ -0,0 +1,62 @@
+const storage = require('Storage');
+let settings;
+
+function updateSettings() {
+  storage.write('hourstrike.json', settings);
+}
+
+function resetSettings() {
+  settings = {
+    on_hour: true,
+    on_half_hour: true,
+    start_hour: 9,
+    end_hour: 21,
+  };
+  updateSettings();
+}
+
+settings = storage.readJSON('hourstrike.json', 1);
+if (!settings) resetSettings();
+
+function showMainMenu() {
+  var mode = ['off', 'v', 'b', 'vb', 'bv'];
+  const mainmenu = {
+    '': { 'title': 'Time Passed' },
+    'On hour': {
+      value: settings.on_hour,
+      format: v => v?"ON":"OFF",
+      onchange: v => {
+        settings.on_hour = v;
+        updateSettings();
+      }
+    },
+    'On half hour': {
+      value: settings.on_half_hour,
+      format: v => v?"ON":"OFF",
+      onchange: v => {
+        settings.on_half_hour = v;
+        updateSettings();
+      }
+    },
+    'Start hour': {
+      value: settings.start_hour,
+      min: 0, max: 23,
+      onchange: v=> {
+        settings.start_hour = v;
+        updateSettings();
+      }
+    },
+    'End hour': {
+      value: settings.end_hour,
+      min: 0, max: 23,
+      onchange: v=> {
+        settings.end_hour = v;
+        updateSettings();
+      }
+    },
+    '< Back': ()=>load()
+  };
+  return E.showMenu(mainmenu);
+}
+
+showMainMenu();
\ No newline at end of file
diff --git a/apps/hourstrike/boot.js b/apps/hourstrike/boot.js
new file mode 100644
index 000000000..901784613
--- /dev/null
+++ b/apps/hourstrike/boot.js
@@ -0,0 +1,21 @@
+(function() {
+  var setting = require('Storage').readJSON('hourstrike.json',1)||[];
+  if (setting.on_hour || setting.on_harlf_hour) {
+    var cur = new Date();
+    var cur_hour = cur.getHours();
+    if (setting.start_hour<=cur_hour&&cur_hour<=setting.end_hour) {
+      var cur_sec = cur.getMinutes()*60+cur.getSeconds();
+      var notify_on = [1800, 3600];
+      var t=cur_sec<notify_on[0]?notify_on[0]-cur_sec:notify_on[1]-cur_sec;
+      var notify_func = function() {
+        Bangle.buzz(100, 0.5)
+          .then(() => new Promise(resolve => setTimeout(resolve,200)))
+          .then(() => Bangle.buzz(100, 0.5));
+      };
+      if (t>0) {
+        setTimeout(notify_func, t*1000);
+        setTimeout(load, t*1000 + 600);
+      }
+    }
+  }
+})();
\ No newline at end of file