diff --git a/src/main.jsx b/src/main.jsx
index a7084818..75435bca 100644
--- a/src/main.jsx
+++ b/src/main.jsx
@@ -48,6 +48,30 @@ setTimeout(() => {
   } catch (e) {}
 }, 5000);
 
+// Service worker cache cleanup
+if ('serviceWorker' in navigator && typeof caches !== 'undefined') {
+  const MAX_SW_CACHE_SIZE = 300;
+  let swInterval = setInterval(() => {
+    if (window.__IDLE__) {
+      clearInterval(swInterval);
+      (async () => {
+        const keys = await caches.keys();
+        for (const key of keys) {
+          const cache = await caches.open(key);
+          const _keys = await cache.keys();
+          if (_keys.length > MAX_SW_CACHE_SIZE) {
+            console.warn('Cleaning cache', key, _keys.length);
+            const deleteKeys = _keys.slice(MAX_SW_CACHE_SIZE);
+            for (const deleteKey of deleteKeys) {
+              await cache.delete(deleteKey);
+            }
+          }
+        }
+      })();
+    }
+  }, 15_000);
+}
+
 window.__CLOAK__ = () => {
   document.body.classList.toggle('cloak');
 };