diff --git a/apps/web/src/components/layout/app/shell/app-shell.tsx b/apps/web/src/components/layout/app/shell/app-shell.tsx
index 26c05cd..a4d97fd 100644
--- a/apps/web/src/components/layout/app/shell/app-shell.tsx
+++ b/apps/web/src/components/layout/app/shell/app-shell.tsx
@@ -1,6 +1,7 @@
 import { Outlet, useRouterState } from "@tanstack/react-router"
 import { AuthProvider } from "@tripwire/auth/components"
 import { TopNav } from "#/components/layout/app/shell/top-nav"
+import { BetaBanner } from "#/components/layout/app/shell/beta-banner"
 import { WorkspaceRedirect } from "#/components/layout/app/shell/workspace-redirect"
 import { InstallGitHubPrompt } from "#/components/layout/app/shell/install-github-prompt"
 import { AskSidePanel } from "#/components/layout/app/chat/ask-side-panel"
@@ -55,8 +56,11 @@ function AppShellInner() {
             isChatRoute ? undefined : { boxShadow: "#00000008 0px 1px 4px" }
           }
         >
-          <div className="absolute inset-0 overflow-auto">
-            {needsInstall ? <InstallGitHubPrompt /> : <Outlet />}
+          <div className="absolute inset-0 flex flex-col">
+            <BetaBanner />
+            <div className="min-h-0 flex-1 overflow-auto">
+              {needsInstall ? <InstallGitHubPrompt /> : <Outlet />}
+            </div>
           </div>
         </div>
 
diff --git a/apps/web/src/components/layout/app/shell/beta-banner.tsx b/apps/web/src/components/layout/app/shell/beta-banner.tsx
new file mode 100644
index 0000000..8fc9f7a
--- /dev/null
+++ b/apps/web/src/components/layout/app/shell/beta-banner.tsx
@@ -0,0 +1,78 @@
+import { useState, useSyncExternalStore } from "react"
+import { Button } from "@tripwire/ui/button"
+import { CloseIcon } from "@tripwire/ui/icons/close-icon"
+import { cn } from "@tripwire/ui/utils"
+
+const STORAGE_KEY = "tripwire:beta-banner:dismissed"
+const EVENT_NAME = "tripwire:beta-banner-dismissed"
+
+function subscribe(callback: () => void): () => void {
+  window.addEventListener(EVENT_NAME, callback)
+  return () => window.removeEventListener(EVENT_NAME, callback)
+}
+
+function getSnapshot(): boolean {
+  return window.localStorage.getItem(STORAGE_KEY) === "true"
+}
+
+function getServerSnapshot(): boolean {
+  return true
+}
+
+function dismiss(): void {
+  window.localStorage.setItem(STORAGE_KEY, "true")
+  window.dispatchEvent(new Event(EVENT_NAME))
+}
+
+export function BetaBanner() {
+  const dismissed = useSyncExternalStore(
+    subscribe,
+    getSnapshot,
+    getServerSnapshot
+  )
+  const [closing, setClosing] = useState(false)
+
+  if (dismissed) return null
+
+  return (
+    <div
+      className={cn(
+        "grid shrink-0 transition-[grid-template-rows] duration-[360ms]",
+        closing ? "grid-rows-[0fr]" : "grid-rows-[1fr]"
+      )}
+      style={{ transitionTimingFunction: "cubic-bezier(0.19, 1, 0.22, 1)" }}
+      onTransitionEnd={(e) => {
+        if (e.target === e.currentTarget) dismiss()
+      }}
+    >
+      <div className="overflow-hidden">
+        <div
+          className={cn(
+            "relative flex items-center justify-center bg-tw-card px-10 py-2 transition-opacity duration-200",
+            closing && "opacity-0"
+          )}
+        >
+          <p className="text-[13px] leading-tight font-medium text-white">
+            Tripwire is in closed beta. Please raise any issues via DM on X{" "}
+            <a
+              href="https://x.com/tripwiredotsh"
+              target="_blank"
+              rel="noreferrer"
+              className="underline underline-offset-2"
+            >
+              @tripwiredotsh
+            </a>
+          </p>
+          <Button
+            variant="ghost"
+            aria-label="Dismiss beta banner"
+            className="absolute right-2 h-6 w-6 p-0 text-white hover:bg-transparent hover:opacity-70"
+            onClick={() => setClosing(true)}
+          >
+            <CloseIcon className="size-3.5" />
+          </Button>
+        </div>
+      </div>
+    </div>
+  )
+}