diff --git a/app/routes.py b/app/routes.py
index e37856d..cbaca4f 100644
--- a/app/routes.py
+++ b/app/routes.py
@@ -1,12 +1,32 @@
 import json
 
-from flask import render_template, jsonify
+from flask import render_template, jsonify, send_from_directory
 
 from app import app
 from app.config import SCOREBOARD_DATA_FILE
 from app.games import parse_games
 
 
+@app.route("/manifest.json")
+def manifest():
+    return send_from_directory(app.static_folder, "manifest.json")
+
+
+@app.route("/sw.js")
+def service_worker():
+    response = send_from_directory(app.static_folder, "sw.js")
+    response.headers["Service-Worker-Allowed"] = "/"
+    response.headers["Cache-Control"] = "no-cache"
+    return response
+
+
+@app.route("/favicon.ico")
+def favicon():
+    return send_from_directory(
+        app.static_folder, "icon-32x32.png", mimetype="image/png"
+    )
+
+
 @app.route("/")
 def index():
     return render_template("index.html")
diff --git a/app/static/icon-180x180.png b/app/static/icon-180x180.png
new file mode 100644
index 0000000..2510949
Binary files /dev/null and b/app/static/icon-180x180.png differ
diff --git a/app/static/icon-192x192.png b/app/static/icon-192x192.png
new file mode 100644
index 0000000..412217b
Binary files /dev/null and b/app/static/icon-192x192.png differ
diff --git a/app/static/icon-32x32.png b/app/static/icon-32x32.png
new file mode 100644
index 0000000..4772f8d
Binary files /dev/null and b/app/static/icon-32x32.png differ
diff --git a/app/static/icon-512x512.png b/app/static/icon-512x512.png
new file mode 100644
index 0000000..72cff75
Binary files /dev/null and b/app/static/icon-512x512.png differ
diff --git a/app/static/manifest.json b/app/static/manifest.json
new file mode 100644
index 0000000..dfe5dcb
--- /dev/null
+++ b/app/static/manifest.json
@@ -0,0 +1,24 @@
+{
+  "name": "NHL Scoreboard",
+  "short_name": "NHL Scores",
+  "description": "Live NHL game scores ranked by hype",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#0f172a",
+  "theme_color": "#0f172a",
+  "orientation": "portrait-primary",
+  "icons": [
+    {
+      "src": "/static/icon-192x192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "any maskable"
+    },
+    {
+      "src": "/static/icon-512x512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "any maskable"
+    }
+  ]
+}
diff --git a/app/static/script.js b/app/static/script.js
index 9d48ecf..2204992 100644
--- a/app/static/script.js
+++ b/app/static/script.js
@@ -240,4 +240,9 @@ function autoRefresh() {
 window.addEventListener('load', () => {
     autoRefresh();
     setInterval(tickClocks, 1000);
+    if ('serviceWorker' in navigator) {
+        navigator.serviceWorker.register('/sw.js').catch(err => {
+            console.warn('Service worker registration failed:', err);
+        });
+    }
 });
diff --git a/app/static/sw.js b/app/static/sw.js
new file mode 100644
index 0000000..9b4034a
--- /dev/null
+++ b/app/static/sw.js
@@ -0,0 +1,49 @@
+const CACHE = 'nhl-scoreboard-v1';
+const PRECACHE = [
+    '/',
+    '/static/styles.css',
+    '/static/script.js',
+    '/static/icon-192x192.png',
+    '/static/icon-512x512.png',
+    '/manifest.json',
+];
+
+self.addEventListener('install', event => {
+    event.waitUntil(caches.open(CACHE).then(c => c.addAll(PRECACHE)));
+    self.skipWaiting();
+});
+
+self.addEventListener('activate', event => {
+    event.waitUntil(
+        caches.keys().then(keys =>
+            Promise.all(keys.filter(k => k !== CACHE).map(k => caches.delete(k)))
+        )
+    );
+    self.clients.claim();
+});
+
+self.addEventListener('fetch', event => {
+    const { pathname } = new URL(event.request.url);
+
+    // Network-first for the live scoreboard API — stale data is useless
+    if (pathname === '/scoreboard') {
+        event.respondWith(
+            fetch(event.request).catch(() => caches.match(event.request))
+        );
+        return;
+    }
+
+    // Cache-first for everything else (static assets, shell)
+    event.respondWith(
+        caches.match(event.request).then(cached => {
+            if (cached) return cached;
+            return fetch(event.request).then(response => {
+                if (response.ok) {
+                    const clone = response.clone();
+                    caches.open(CACHE).then(c => c.put(event.request, clone));
+                }
+                return response;
+            });
+        })
+    );
+});
diff --git a/app/templates/index.html b/app/templates/index.html
index 815a3e3..9d31530 100644
--- a/app/templates/index.html
+++ b/app/templates/index.html
@@ -3,6 +3,13 @@
 <head>
     <title>NHL Scoreboard</title>
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <meta name="theme-color" content="#0f172a">
+    <meta name="apple-mobile-web-app-capable" content="yes">
+    <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
+    <meta name="apple-mobile-web-app-title" content="NHL Scores">
+    <link rel="manifest" href="/manifest.json">
+    <link rel="icon" type="image/png" href="/static/icon-32x32.png">
+    <link rel="apple-touch-icon" href="/static/icon-180x180.png">
     <link rel="stylesheet" type="text/css" href="/static/styles.css">
 </head>
 <body>