diff --git a/webassets/manifest.webmanifest b/webassets/manifest.webmanifest
new file mode 100644
index 0000000..4fa3434
--- /dev/null
+++ b/webassets/manifest.webmanifest
@@ -0,0 +1,27 @@
+{
+    "dir": "ltr",
+    "lang": "English",
+    "name": "Spothole",
+    "short_name": "Spothole",
+    "scope": "/",
+    "display": "standalone",
+    "start_url": "https://spothole.m0trt.radio/",
+    "background_color": "white",
+    "theme_color": "white",
+    "description": "An Amateur Radio spotting tool bringing together DX clusters and outdoor programmes, providing a universal JSON API and web interface.",
+    "related_applications": [],
+    "prefer_related_applications": false,
+    "icons": [
+    {
+      "src": "/img/icon-192.png",
+      "type": "image/png",
+      "sizes": "192x192"
+    },
+    {
+      "src": "/img/icon-512.png",
+      "type": "image/png",
+      "sizes": "512x512"
+    }
+  ],
+  "url": "https://spothole.m0trt.radio"
+}
diff --git a/webassets/service-worker.js b/webassets/service-worker.js
new file mode 100644
index 0000000..520f8c2
--- /dev/null
+++ b/webassets/service-worker.js
@@ -0,0 +1,42 @@
+const CACHE_NAME = 'Spothole';
+const CACHE_URLS = [
+  'index.html',
+  './',
+  'apidocs',
+  'apidocs/openapi.yml',
+  'about',
+  'css/style.css',
+  'js/code.js',
+  'img/logo.png',
+  'img/favicon.ico',
+  'img/icon-32.png',
+  'img/icon-192.png',
+  'img/icon-512.png',
+  'fa/css/fontawesome.min.css',
+  'fa/css/solid.min.css',
+  'fa/webfonts/fa-solid-900.ttf',
+  'fa/webfonts/fa-solid-900.woff2'
+];
+
+self.addEventListener('fetch', (event) => {
+  // Is this an asset we can cache?
+  const url = new URL(event.request.url);
+  const isCacheableRequest = CACHE_URLS.includes(url.pathname);
+
+  if (isCacheableRequest) {
+    // Open the cache
+    event.respondWith(caches.open(CACHE_NAME).then((cache) => {
+      // Go to the network first, cacheing the response
+      return fetch(event.request.url).then((fetchedResponse) => {
+        cache.put(event.request, fetchedResponse.clone());
+
+        return fetchedResponse;
+      }).catch(() => {
+        // If the network is unavailable, get from cache.
+        return cache.match(event.request.url);
+      });
+    }));
+  } else {
+    // Not a cacheable request, must be a call to the API, so no cache involved just go to the network
+  }
+});