diff --git a/client/README.MD b/client/README.MD
index 4b27fbd26..855fd6c27 100644
--- a/client/README.MD
+++ b/client/README.MD
@@ -1,3 +1,7 @@
 # Spoolman UI
 
 A simple [refine](https://github.com/refinedev/refine) based UI for manipulating the data in the Spoolman database.
+
+## Local Review Cache Reset
+
+Set `VITE_BYPASS_LOOPBACK_PWA_CACHE=true` when you want loopback URLs such as `localhost`, `127.0.0.1`, or `::1` to clear existing service workers and browser caches before the app boots. This is intended for local review and debugging when stale PWA assets are masking the current frontend bundle.
diff --git a/client/src/index.tsx b/client/src/index.tsx
index 75e4dcd06..056aade8e 100644
--- a/client/src/index.tsx
+++ b/client/src/index.tsx
@@ -5,6 +5,32 @@ import { createRoot } from "react-dom/client";
 import App from "./App";
 import "./i18n";
 
+const shouldBypassLoopbackPwaCache = import.meta.env["VITE_BYPASS_LOOPBACK_PWA_CACHE"] === "true";
+const normalizedHostname = window.location.hostname.replace(/^\[|\]$/g, "");
+const isLoopbackHost =
+  normalizedHostname === "localhost" ||
+  normalizedHostname === "::1" ||
+  /^127(?:\.\d{1,3}){3}$/.test(normalizedHostname);
+
+if (shouldBypassLoopbackPwaCache && isLoopbackHost) {
+  // Opt-in local review builds can clear loopback-host PWA state before boot so stale assets
+  // from earlier test runs do not mask the current bundle.
+  if ("serviceWorker" in navigator) {
+    void navigator.serviceWorker.getRegistrations().then((registrations) => {
+      registrations.forEach((registration) => {
+        void registration.unregister();
+      });
+    });
+  }
+  if ("caches" in window) {
+    void caches.keys().then((keys) => {
+      keys.forEach((key) => {
+        void caches.delete(key);
+      });
+    });
+  }
+}
+
 const container = document.getElementById("root") as HTMLElement;
 const root = createRoot(container);