diff --git a/index.html b/index.html
index be41d4a..ae9b1b4 100644
--- a/index.html
+++ b/index.html
@@ -19,6 +19,7 @@
         });
         </script>
         <title>Interval Timer</title>
+        <link rel="apple-touch-icon" sizes="180x180" href="/img/apple-touch-icon-180x180.png">
         <link rel="apple-touch-icon" sizes="57x57" href="/img/apple-touch-icon-57x57.png">
         <link rel="apple-touch-icon" sizes="60x60" href="/img/apple-touch-icon-60x60.png">
         <link rel="apple-touch-icon" sizes="72x72" href="/img/apple-touch-icon-72x72.png">
@@ -27,14 +28,13 @@
         <link rel="apple-touch-icon" sizes="120x120" href="/img/apple-touch-icon-120x120.png">
         <link rel="apple-touch-icon" sizes="144x144" href="/img/apple-touch-icon-144x144.png">
         <link rel="apple-touch-icon" sizes="152x152" href="/img/apple-touch-icon-152x152.png">
-        <link rel="apple-touch-icon" sizes="180x180" href="/img/apple-touch-icon-180x180.png">
         <link rel="icon" type="image/png" href="/img/favicon-32x32.png" sizes="32x32">
         <link rel="icon" type="image/png" href="/img/favicon-194x194.png" sizes="194x194">
-        <link rel="icon" type="image/png" href="/img/android-chrome-192x192.png" sizes="192x192">
+        <link rel="shortcut icon" type="image/png" href="/img/android-chrome-192x192.png" sizes="192x192">
         <link rel="icon" type="image/png" href="/img/favicon-16x16.png" sizes="16x16">
         <link rel="manifest" href="/img/manifest.json">
         <link rel="mask-icon" href="/img/safari-pinned-tab.svg" color="#ffeb3b">
-        <link rel="shortcut icon" href="/img/favicon.ico">
+        <link rel="icon" href="/img/favicon.ico">
         <meta name="msapplication-TileColor" content="#ffc40d">
         <meta name="msapplication-TileImage" content="/img/mstile-144x144.png">
         <meta name="msapplication-config" content="/img/browserconfig.xml">
@@ -79,5 +79,12 @@
                 <a class="form-button" id="save" ng-click="settingsOpen = false; closeSettings = true; time = warmUpTime; resetTimer(); saveTimer()" href="#"> Save Changes</a>
             </form>
         </div>
+        <script>
+        if('serviceWorker' in navigator) {
+          navigator.serviceWorker
+                   .register('/sw.js')
+                   .then(function() { console.log("Service Worker Registered"); });
+        }
+        </script>
     </body>
 </html>
diff --git a/sw.js b/sw.js
new file mode 100644
index 0000000..9c7c4c9
--- /dev/null
+++ b/sw.js
@@ -0,0 +1,42 @@
+self.addEventListener('install', function(e) {
+ e.waitUntil(
+   caches.open('wbrawner-interval-timer').then(function(cache) {
+     return cache.addAll([
+       '/',
+       '/audio/beep-10.mp3',
+       '/audio/beep-09.mp3',
+       '/audio/button-42(1).mp3',
+       '/css/addtohomescreen.css',
+       '/css/font-awesome.min.css',
+       '/css/styles.css',
+       '/fonts/fontawesome-webfont.woff',
+       '/fonts/FontAwesome.otf',
+       '/fonts/fontawesome-webfont.svg',
+       '/fonts/fontawesome-webfont.woff2',
+       '/fonts/fontawesome-webfont.ttf',
+       '/fonts/fontawesome-webfont.eot',
+       '/index.html',
+       '/js/start.js',
+       '/js/angular-cookies.min.js',
+       '/js/addtohomescreen.min.js',
+       '/js/addtohomescreen.js',
+       '/js/angular.min.js',
+       '/js/app.js',
+       '/sw.js'
+     ]);
+   })
+ );
+});
+
+self.addEventListener('fetch', function(event) {
+ event.respondWith(
+     caches.match(event.request).then(function(response) {
+         caches.open('wbrawner-interval-timer').then(function(cache) {
+             if (event.request.url.match(/^https?/)) {
+                cache.add(event.request.url);
+             }
+         })
+         return response || fetch(event.request);
+     })
+  );
+});