diff --git a/apps/marginalia/web/src/App.tsx b/apps/marginalia/web/src/App.tsx
index 526ac6a9..63be23b1 100644
--- a/apps/marginalia/web/src/App.tsx
+++ b/apps/marginalia/web/src/App.tsx
@@ -7,7 +7,7 @@ import { IconSpritesheet } from '@a-type/ui/components/icon';
 import { ErrorBoundary } from '@a-type/ui/components/errorBoundary';
 import { TooltipProvider } from '@a-type/ui/components/tooltip';
 import { ParticleLayer } from '@a-type/ui/components/particles';
-import { ReloadButton } from '@biscuits/client';
+import { PrereleaseWarning, ReloadButton } from '@biscuits/client';
 import { H1, P } from '@a-type/ui/components/typography';
 import {
   useCanSync,
@@ -50,6 +50,7 @@ export function App({}: AppProps) {
               <QueryClientProvider client={queryClient}>
                 <ParticleLayer>
                   <AppPreviewNotice />
+                  <PrereleaseWarning />
                   <Pages />
                   <Toaster
                     position="bottom-center"
diff --git a/apps/shopping/web/src/App.tsx b/apps/shopping/web/src/App.tsx
index 7a973767..d01d98e9 100644
--- a/apps/shopping/web/src/App.tsx
+++ b/apps/shopping/web/src/App.tsx
@@ -7,7 +7,7 @@ import { IconSpritesheet } from '@a-type/ui/components/icon';
 import { ErrorBoundary } from '@a-type/ui/components/errorBoundary';
 import { TooltipProvider } from '@a-type/ui/components/tooltip';
 import { ParticleLayer } from '@a-type/ui/components/particles';
-import { ReloadButton } from '@biscuits/client';
+import { PrereleaseWarning, ReloadButton } from '@biscuits/client';
 import { H1, P } from '@a-type/ui/components/typography';
 
 export interface AppProps {}
@@ -21,6 +21,7 @@ export function App({}: AppProps) {
         <Suspense>
           <VerdantProvider>
             <ParticleLayer>
+              <PrereleaseWarning />
               <Pages />
               <Toaster
                 position="bottom-center"
diff --git a/apps/star-chart/web/src/App.tsx b/apps/star-chart/web/src/App.tsx
index 1fb6809c..0ad6f265 100644
--- a/apps/star-chart/web/src/App.tsx
+++ b/apps/star-chart/web/src/App.tsx
@@ -7,7 +7,7 @@ import { IconSpritesheet } from '@a-type/ui/components/icon';
 import { ErrorBoundary } from '@a-type/ui/components/errorBoundary';
 import { TooltipProvider } from '@a-type/ui/components/tooltip';
 import { ParticleLayer } from '@a-type/ui/components/particles';
-import { ReloadButton } from '@biscuits/client';
+import { PrereleaseWarning, ReloadButton } from '@biscuits/client';
 import { H1, P } from '@a-type/ui/components/typography';
 import {
   useCanSync,
@@ -41,6 +41,7 @@ export function App({}: AppProps) {
             <VerdantProvider>
               <ParticleLayer>
                 <AppPreviewNotice />
+                <PrereleaseWarning />
                 <Pages />
                 <Toaster
                   position="bottom-center"
diff --git a/packages/client/src/components/PrereleaseWarning.tsx b/packages/client/src/components/PrereleaseWarning.tsx
new file mode 100644
index 00000000..737a2e55
--- /dev/null
+++ b/packages/client/src/components/PrereleaseWarning.tsx
@@ -0,0 +1,32 @@
+import { useAppInfo } from '../react.js';
+import { Icon } from '@a-type/ui/components/icon';
+
+export interface PrereleaseWarningProps {}
+
+export function PrereleaseWarning({}: PrereleaseWarningProps) {
+  const app = useAppInfo();
+
+  if (!app.prerelease) {
+    return null;
+  }
+
+  if (import.meta.env.DEV) return null;
+
+  return (
+    <div className="bg-attention-light text-black row p-1 text-xxs items-center justify-center">
+      <Icon name="warning" />
+      <span>
+        {app.name} is an unreleased{' '}
+        <a
+          target="_blank"
+          rel="noreferrer"
+          href="https://biscuits.club"
+          className="underline"
+        >
+          Biscuits
+        </a>{' '}
+        app. It may be unstable or incomplete, and your data might be lost.
+      </span>
+    </div>
+  );
+}
diff --git a/packages/client/src/components/index.ts b/packages/client/src/components/index.ts
index f1bf523b..67556765 100644
--- a/packages/client/src/components/index.ts
+++ b/packages/client/src/components/index.ts
@@ -24,3 +24,4 @@ export * from './TosPrompt.js';
 export * from './Essentials.js';
 export * from './ReloadButton.js';
 export * from './Explainer.js';
+export * from './PrereleaseWarning.js';
diff --git a/scripts/create-app/template/web/src/App.tsx b/scripts/create-app/template/web/src/App.tsx
index 7685805d..c031931b 100644
--- a/scripts/create-app/template/web/src/App.tsx
+++ b/scripts/create-app/template/web/src/App.tsx
@@ -14,6 +14,7 @@ import {
   Provider,
   createGraphQLClient,
   AppPreviewNotice,
+  PrereleaseWarning,
 } from '@biscuits/client';
 
 export interface AppProps {}
@@ -41,6 +42,7 @@ export function App({}: AppProps) {
             <VerdantProvider>
               <ParticleLayer>
                 <AppPreviewNotice />
+                <PrereleaseWarning />
                 <Pages />
                 <Toaster
                   position="bottom-center"