diff --git a/client/src/App.css b/client/src/App.css
index 3421dd9..2868e45 100644
--- a/client/src/App.css
+++ b/client/src/App.css
@@ -63,6 +63,16 @@ body {
   margin-bottom: 15px;
 }
 
+.auth-brand-title-row {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  justify-content: center;
+  gap: 10px;
+  margin-bottom: 14px;
+}
+
+.auth-brand-title-row h1,
 .auth-brand h1 {
   font-size: 32px;
   font-weight: 700;
@@ -71,7 +81,7 @@ body {
   -webkit-background-clip: text;
   background-clip: text;
   -webkit-text-fill-color: transparent;
-  margin: 0 0 14px 0;
+  margin: 0;
   line-height: 1.25;
   letter-spacing: -0.5px;
 }
@@ -3191,6 +3201,28 @@ html.theme-cupertino .events-scroll-container {
   border: 1px solid rgba(251, 191, 36, 0.25);
 }
 
+.beta-badge {
+  display: inline-flex;
+  align-items: center;
+  padding: 2px 8px;
+  border-radius: 999px;
+  font-size: 11px;
+  font-weight: 600;
+  letter-spacing: 0.04em;
+  text-transform: uppercase;
+  color: var(--app-accent-light);
+  background: var(--app-accent-bg);
+  border: 1px solid var(--app-accent-focus-ring);
+  flex-shrink: 0;
+}
+
+.header-brand-title-row {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: 10px;
+}
+
 .role-badge {
   display: inline-flex;
   align-items: center;
diff --git a/client/src/App.tsx b/client/src/App.tsx
index 58e2a02..5d1e7ee 100644
--- a/client/src/App.tsx
+++ b/client/src/App.tsx
@@ -28,6 +28,7 @@ import PwaInstallPrompt from './components/PwaInstallPrompt.tsx'
 import PwaUpdatePrompt from './components/PwaUpdatePrompt.tsx'
 import AppFooter from './components/AppFooter.tsx'
 import LogbookRoleBadge from './components/LogbookRoleBadge.tsx'
+import BetaBadge from './components/BetaBadge.tsx'
 import { db } from './services/db.js'
 import { getLogbookAccess } from './services/logbookAccess.js'
 import type { LogbookAccessRole } from './services/logbook.js'
@@ -452,6 +453,7 @@ function App() {
             <div className="app-title-area">
               <div className="app-title-row">
                 <h2>{activeLogbookTitle}</h2>
+                <BetaBadge />
                 {activeAccessRole && activeAccessRole !== 'OWNER' && (
                   <LogbookRoleBadge role={activeAccessRole} />
                 )}
diff --git a/client/src/components/AuthOnboarding.tsx b/client/src/components/AuthOnboarding.tsx
index d614c05..8e02d43 100644
--- a/client/src/components/AuthOnboarding.tsx
+++ b/client/src/components/AuthOnboarding.tsx
@@ -13,6 +13,7 @@ import {
 } from '../services/auth.js'
 import { KeyRound, ShieldAlert, Languages, HelpCircle, UserRound, X } from 'lucide-react'
 import RegistrationDisclaimer from './RegistrationDisclaimer.tsx'
+import BetaBadge from './BetaBadge.tsx'
 
 interface AuthOnboardingProps {
   onAuthenticated: () => void
@@ -408,7 +409,10 @@ export default function AuthOnboarding({ onAuthenticated, onOpenDemo }: AuthOnbo
     <div className="auth-card glass">
       <div className="auth-brand">
         <img src="/logo.png" alt="Kapteins Daagbok" className="auth-logo-img" />
-        <h1>{t('app.name')}</h1>
+        <div className="auth-brand-title-row">
+          <h1>{t('app.name')}</h1>
+          <BetaBadge />
+        </div>
         <p className="tagline">{t('auth.tagline')}</p>
       </div>
 
diff --git a/client/src/components/BetaBadge.tsx b/client/src/components/BetaBadge.tsx
new file mode 100644
index 0000000..a67fabd
--- /dev/null
+++ b/client/src/components/BetaBadge.tsx
@@ -0,0 +1,19 @@
+import { useTranslation } from 'react-i18next'
+
+interface BetaBadgeProps {
+  className?: string
+}
+
+export default function BetaBadge({ className = '' }: BetaBadgeProps) {
+  const { t } = useTranslation()
+
+  return (
+    <span
+      className={`beta-badge ${className}`.trim()}
+      title={t('app.beta_hint')}
+      aria-label={t('app.beta_hint')}
+    >
+      {t('app.beta')}
+    </span>
+  )
+}
diff --git a/client/src/components/LogbookDashboard.tsx b/client/src/components/LogbookDashboard.tsx
index 1cf44cb..e2fb9ef 100644
--- a/client/src/components/LogbookDashboard.tsx
+++ b/client/src/components/LogbookDashboard.tsx
@@ -4,6 +4,7 @@ import { useLiveQuery } from 'dexie-react-hooks'
 import { db } from '../services/db.js'
 import { fetchLogbooks, createLogbook, deleteLogbook, type DecryptedLogbook } from '../services/logbook.js'
 import LogbookRoleBadge from './LogbookRoleBadge.tsx'
+import BetaBadge from './BetaBadge.tsx'
 import { PlausibleEvents, trackPlausibleEvent } from '../services/analytics.js'
 import { logoutUser } from '../services/auth.js'
 import { useDialog } from './ModalDialog.tsx'
@@ -177,7 +178,10 @@ export default function LogbookDashboard({ onSelectLogbook, onLogout }: LogbookD
         <div className="header-brand">
           <Ship className="header-logo" size={32} />
           <div>
-            <h1>{t('app.name')}</h1>
+            <div className="header-brand-title-row">
+              <h1>{t('app.name')}</h1>
+              <BetaBadge />
+            </div>
             <p className="subtitle">{t('app.tagline')}</p>
           </div>
         </div>
diff --git a/client/src/i18n/locales/de.json b/client/src/i18n/locales/de.json
index c360709..fc7ffb9 100644
--- a/client/src/i18n/locales/de.json
+++ b/client/src/i18n/locales/de.json
@@ -2,7 +2,9 @@
   "translation": {
     "app": {
       "name": "Kapteins Daagbok",
-      "tagline": "Privates Yacht-Logbuch"
+      "tagline": "Privates Yacht-Logbuch",
+      "beta": "Beta",
+      "beta_hint": "Beta-Version — Funktionen können sich noch ändern"
     },
     "nav": {
       "dashboard": "Dashboard",
diff --git a/client/src/i18n/locales/en.json b/client/src/i18n/locales/en.json
index a813db7..60ea864 100644
--- a/client/src/i18n/locales/en.json
+++ b/client/src/i18n/locales/en.json
@@ -2,7 +2,9 @@
   "translation": {
     "app": {
       "name": "Kapteins Daagbok",
-      "tagline": "Private Yacht Logbook"
+      "tagline": "Private Yacht Logbook",
+      "beta": "Beta",
+      "beta_hint": "Beta release — features may still change"
     },
     "nav": {
       "dashboard": "Dashboard",