diff --git a/apps/mana/apps/web/src/lib/components/llm/SourceBadge.svelte b/apps/mana/apps/web/src/lib/components/llm/SourceBadge.svelte
new file mode 100644
index 000000000..a394cf40a
--- /dev/null
+++ b/apps/mana/apps/web/src/lib/components/llm/SourceBadge.svelte
@@ -0,0 +1,62 @@
+<script lang="ts">
+	/**
+	 * SourceBadge — small inline label that tells the user which LLM tier
+	 * produced an AI result. Use it next to any displayed LLM output so
+	 * the user can see at a glance whether their data stayed on-device,
+	 * went to our server, or went to Google.
+	 *
+	 * The badge respects `llmSettingsState.showSourceInUi` — if the user
+	 * has explicitly hidden source badges in settings, this component
+	 * renders nothing.
+	 *
+	 * Usage:
+	 *   <SourceBadge tier={result.source} />
+	 *   <SourceBadge tier={result.source} latencyMs={result.latencyMs} />
+	 */
+	import { llmSettingsState, tierLabel, type LlmTier } from '@mana/shared-llm';
+	import { Lightning, Cpu, HardDrive, Cloud } from '@mana/shared-icons';
+
+	interface Props {
+		tier: LlmTier;
+		latencyMs?: number;
+	}
+
+	let { tier, latencyMs }: Props = $props();
+
+	const settings = $derived(llmSettingsState.current);
+
+	// Per-tier visual treatment — color encodes privacy gradient.
+	const tierStyles: Record<LlmTier, { color: string; icon: typeof Lightning }> = {
+		none: {
+			color: 'border-muted-foreground/30 bg-muted/20 text-muted-foreground',
+			icon: Lightning, // "fast" — rules-based is instant
+		},
+		browser: {
+			color: 'border-emerald-500/40 bg-emerald-500/10 text-emerald-600 dark:text-emerald-400',
+			icon: Cpu, // on-device hardware
+		},
+		'mana-server': {
+			color: 'border-blue-500/40 bg-blue-500/10 text-blue-600 dark:text-blue-400',
+			icon: HardDrive, // our infrastructure
+		},
+		cloud: {
+			color: 'border-amber-500/40 bg-amber-500/10 text-amber-600 dark:text-amber-400',
+			icon: Cloud, // remote
+		},
+	};
+
+	const style = $derived(tierStyles[tier]);
+</script>
+
+{#if settings.showSourceInUi}
+	<span
+		class="inline-flex items-center gap-1 rounded-full border px-2 py-0.5 text-[10px] font-medium {style.color}"
+		title="Diese Antwort wurde auf der Schicht '{tierLabel(tier)}' erzeugt"
+	>
+		<style.icon size={10} weight="fill" />
+		<span>{tierLabel(tier)}</span>
+		{#if latencyMs !== undefined}
+			<span class="opacity-60">· {latencyMs}ms</span>
+		{/if}
+	</span>
+{/if}
diff --git a/apps/mana/apps/web/src/lib/components/onboarding/OnboardingWizard.svelte b/apps/mana/apps/web/src/lib/components/onboarding/OnboardingWizard.svelte
index 018c883af..071e7d92b 100644
--- a/apps/mana/apps/web/src/lib/components/onboarding/OnboardingWizard.svelte
+++ b/apps/mana/apps/web/src/lib/components/onboarding/OnboardingWizard.svelte
@@ -5,6 +5,7 @@
 	import WelcomeStep from './steps/WelcomeStep.svelte';
 	import ProfileStep from './steps/ProfileStep.svelte';
 	import AppsStep from './steps/AppsStep.svelte';
+	import AiTierStep from './steps/AiTierStep.svelte';
 	import CreditsStep from './steps/CreditsStep.svelte';
 	import CompleteStep from './steps/CompleteStep.svelte';
 	import { Check } from '@mana/shared-icons';
@@ -22,6 +23,7 @@
 		{ id: 'welcome', label: 'Willkommen', component: WelcomeStep },
 		{ id: 'profile', label: 'Profil', component: ProfileStep },
 		{ id: 'apps', label: 'Apps', component: AppsStep },
+		{ id: 'ai-tier', label: 'KI', component: AiTierStep },
 		{ id: 'credits', label: 'Credits', component: CreditsStep },
 		{ id: 'complete', label: 'Fertig', component: CompleteStep },
 	];
diff --git a/apps/mana/apps/web/src/lib/components/onboarding/steps/AiTierStep.svelte b/apps/mana/apps/web/src/lib/components/onboarding/steps/AiTierStep.svelte
new file mode 100644
index 000000000..4560f5844
--- /dev/null
+++ b/apps/mana/apps/web/src/lib/components/onboarding/steps/AiTierStep.svelte
@@ -0,0 +1,145 @@
+<script lang="ts">
+	/**
+	 * Onboarding step: introduces the four LLM tiers and lets the user
+	 * pick which ones Mana is allowed to use. Same routing semantics as
+	 * the AiSettings card on the main settings page, but compressed into
+	 * a single onboarding screen with a "you can change this anytime"
+	 * note at the bottom.
+	 *
+	 * Default: nothing selected → user explicitly opts in.
+	 */
+	import { llmSettingsState, updateLlmSettings, tierLabel, type LlmTier } from '@mana/shared-llm';
+	import { isLocalLlmSupported } from '@mana/local-llm';
+	import { Robot, Cpu, HardDrive, Cloud, CheckCircle, Info } from '@mana/shared-icons';
+
+	const settings = $derived(llmSettingsState.current);
+	const webgpuSupported = isLocalLlmSupported();
+
+	function toggleTier(tier: LlmTier) {
+		const current = settings.allowedTiers;
+		const next = current.includes(tier) ? current.filter((t) => t !== tier) : [...current, tier];
+		updateLlmSettings({ allowedTiers: next });
+	}
+
+	const cards = [
+		{
+			tier: 'browser' as LlmTier,
+			icon: Cpu,
+			title: 'Auf deinem Gerät',
+			tagline: 'Maximale Privatsphäre',
+			description: 'Gemma 4 läuft direkt im Browser. ~500 MB einmaliger Download.',
+			privacyDot: 'bg-emerald-500',
+			disabled: !webgpuSupported,
+			disabledHint: 'Braucht WebGPU (Chrome 113+, Safari 18+).',
+		},
+		{
+			tier: 'mana-server' as LlmTier,
+			icon: HardDrive,
+			title: 'Mana-Server',
+			tagline: 'Selbst-gehostet',
+			description: 'Anfragen laufen zu unserem Server. Schneller, immer noch privat.',
+			privacyDot: 'bg-blue-500',
+			disabled: false,
+		},
+		{
+			tier: 'cloud' as LlmTier,
+			icon: Cloud,
+			title: 'Google Gemini',
+			tagline: 'Stärkstes Modell',
+			description: 'Beste Qualität für komplexe Aufgaben — Daten gehen zu Google.',
+			privacyDot: 'bg-amber-500',
+			disabled: false,
+		},
+	];
+</script>
+
+<div class="mx-auto max-w-2xl">
+	<div class="mb-6 text-center">
+		<div class="mx-auto mb-3 flex h-14 w-14 items-center justify-center rounded-full bg-primary/10">
+			<Robot size={28} class="text-primary" />
+		</div>
+		<h2 class="mb-2 text-2xl font-bold">Wie soll Mana KI nutzen?</h2>
+		<p class="text-muted-foreground">
+			Mana bietet KI-Funktionen auf vier Ebenen — von "gar keine" bis zu allem. Du entscheidest,
+			welche Schichten dein Vertrauen haben.
+		</p>
+	</div>
+
+	<!-- Always-on tier 0 -->
+	<div class="mb-3 rounded-xl border border-emerald-500/30 bg-emerald-500/5 p-4">
+		<div class="flex items-center gap-3">
+			<CheckCircle size={20} weight="fill" class="text-emerald-500" />
+			<div class="flex-1">
+				<div class="font-semibold">Lokal (ohne KI) — immer aktiv</div>
+				<div class="text-sm text-muted-foreground">
+					Datum-Erkennung, Suche und einfache Klassifikation laufen offline ohne KI. Brauchst du
+					nichts auswählen — das ist immer da.
+				</div>
+			</div>
+		</div>
+	</div>
+
+	<!-- Toggleable tiers -->
+	<div class="space-y-3">
+		{#each cards as card}
+			{@const enabled = settings.allowedTiers.includes(card.tier)}
+			<button
+				type="button"
+				onclick={() => !card.disabled && toggleTier(card.tier)}
+				disabled={card.disabled}
+				class="w-full rounded-xl border p-4 text-left transition-all {enabled
+					? 'border-primary bg-primary/5 ring-1 ring-primary/30'
+					: 'border-border bg-card hover:border-primary/40'} {card.disabled
+					? 'cursor-not-allowed opacity-50'
+					: 'cursor-pointer'}"
+			>
+				<div class="flex items-start gap-3">
+					<div
+						class="flex h-10 w-10 shrink-0 items-center justify-center rounded-lg {enabled
+							? 'bg-primary/20 text-primary'
+							: 'bg-muted text-muted-foreground'}"
+					>
+						<card.icon size={20} />
+					</div>
+					<div class="min-w-0 flex-1">
+						<div class="flex items-center gap-2">
+							<h3 class="font-semibold">{card.title}</h3>
+							<span class="h-1.5 w-1.5 rounded-full {card.privacyDot}"></span>
+							<span class="text-xs text-muted-foreground">{card.tagline}</span>
+							{#if enabled}
+								<span
+									class="ml-auto rounded-full bg-primary px-2 py-0.5 text-[10px] font-medium text-primary-foreground"
+								>
+									aktiv
+								</span>
+							{/if}
+						</div>
+						<p class="mt-1 text-sm text-muted-foreground">{card.description}</p>
+						{#if card.disabled && card.disabledHint}
+							<p class="mt-1 text-xs text-amber-600 dark:text-amber-400">
+								{card.disabledHint}
+							</p>
+						{/if}
+					</div>
+				</div>
+			</button>
+		{/each}
+	</div>
+
+	<!-- Live chain summary -->
+	{#if settings.allowedTiers.length > 0}
+		<div class="mt-4 rounded-lg bg-muted/30 px-3 py-2 text-xs text-muted-foreground">
+			<span class="font-medium text-foreground">Reihenfolge: </span>
+			{settings.allowedTiers.map((t) => tierLabel(t)).join(' → ')} → Lokal (Fallback)
+		</div>
+	{/if}
+
+	<div class="mt-6 flex items-start gap-3 rounded-xl bg-primary/5 p-4">
+		<Info size={20} class="mt-0.5 shrink-0 text-primary" />
+		<div class="text-sm text-muted-foreground">
+			Du kannst diese Auswahl jederzeit in den Einstellungen ändern. Es ist auch komplett okay, hier
+			nichts auszuwählen — KI-Funktionen sind in Mana optional und alle Kern-Features funktionieren
+			ohne sie.
+		</div>
+	</div>
+</div>
diff --git a/apps/mana/apps/web/src/lib/components/settings/AiSettings.svelte b/apps/mana/apps/web/src/lib/components/settings/AiSettings.svelte
new file mode 100644
index 000000000..def9c1042
--- /dev/null
+++ b/apps/mana/apps/web/src/lib/components/settings/AiSettings.svelte
@@ -0,0 +1,324 @@
+<script lang="ts">
+	/**
+	 * AiSettings — Settings-page section for the tiered LLM orchestrator.
+	 *
+	 * Lets the user pick which @mana/shared-llm tiers Mana is allowed to
+	 * use. Each tier is a checkbox with an explanation of what it means
+	 * for privacy + speed + cost. The cloud tier is gated behind an
+	 * additional consent checkbox the first time it's enabled.
+	 *
+	 * Drops into the main settings page (/settings) as a self-contained
+	 * Card section, mirroring the existing PasskeyManager / SessionManager
+	 * pattern.
+	 */
+	import { llmSettingsState, updateLlmSettings, tierLabel, type LlmTier } from '@mana/shared-llm';
+	import {
+		isLocalLlmSupported,
+		getLocalLlmStatus,
+		loadLocalLlm,
+		MODELS,
+		DEFAULT_MODEL,
+	} from '@mana/local-llm';
+	import { Robot, Cpu, HardDrive, Cloud, Warning, CheckCircle } from '@mana/shared-icons';
+
+	const settings = $derived(llmSettingsState.current);
+	const webgpuSupported = isLocalLlmSupported();
+	const localLlmStatus = getLocalLlmStatus();
+	const defaultModelInfo = MODELS[DEFAULT_MODEL];
+
+	let loadingBrowser = $state(false);
+
+	function toggleTier(tier: LlmTier) {
+		if (tier === 'none') return; // 'none' is implicit, not a real toggle
+		const current = settings.allowedTiers;
+		const next = current.includes(tier) ? current.filter((t) => t !== tier) : [...current, tier];
+		updateLlmSettings({ allowedTiers: next });
+	}
+
+	async function loadBrowserModel() {
+		loadingBrowser = true;
+		try {
+			await loadLocalLlm();
+		} finally {
+			loadingBrowser = false;
+		}
+	}
+
+	function setCloudConsent(value: boolean) {
+		updateLlmSettings({ cloudConsentGiven: value });
+	}
+
+	function setFallback(value: boolean) {
+		updateLlmSettings({ fallbackToRulesOnError: value });
+	}
+
+	function setShowSource(value: boolean) {
+		updateLlmSettings({ showSourceInUi: value });
+	}
+
+	// Tier card metadata — defined inline because it's specific to this UI
+	// and changes alongside layout updates.
+	type TierCard = {
+		tier: LlmTier;
+		icon: typeof Robot;
+		title: string;
+		subtitle: string;
+		bullets: string[];
+		warning?: string;
+	};
+
+	const tierCards: TierCard[] = [
+		{
+			tier: 'browser',
+			icon: Cpu,
+			title: 'Auf deinem Gerät',
+			subtitle: 'Gemma 4 E2B (Google) im Browser',
+			bullets: [
+				'100% lokal — Daten verlassen dein Gerät nicht',
+				'~500 MB einmaliger Download',
+				'Braucht WebGPU + 2 GB freien GPU-Speicher',
+			],
+		},
+		{
+			tier: 'mana-server',
+			icon: HardDrive,
+			title: 'Mana-Server',
+			subtitle: 'Selbst-gehostet auf unserem Mac Mini',
+			bullets: [
+				'Schneller und stärker als Browser-LLM',
+				'Daten laufen verschlüsselt zu unserem Server',
+				'Keine Inhalte werden gespeichert',
+			],
+		},
+		{
+			tier: 'cloud',
+			icon: Cloud,
+			title: 'Google Gemini',
+			subtitle: 'Cloud-API über unseren Server-Proxy',
+			bullets: [
+				'Stärkste Qualität für komplexe Aufgaben',
+				'Schnellste Antworten',
+				'Daten werden von Google verarbeitet',
+			],
+			warning: 'Nur empfehlenswert für nicht-sensitive Inhalte',
+		},
+	];
+
+	function isEnabled(tier: LlmTier): boolean {
+		return settings.allowedTiers.includes(tier);
+	}
+
+	const browserCacheReady = $derived(webgpuSupported && localLlmStatus.current.state === 'ready');
+</script>
+
+<div class="p-6">
+	<div class="mb-6 flex items-center gap-3">
+		<div
+			class="flex h-10 w-10 items-center justify-center rounded-full bg-indigo-100 text-indigo-600 dark:bg-indigo-900/20 dark:text-indigo-400"
+		>
+			<Robot size={20} />
+		</div>
+		<div>
+			<h2 class="text-lg font-semibold">KI-Optionen</h2>
+			<p class="text-sm text-muted-foreground">
+				Wähle, welche KI-Schichten Mana verwenden darf — von gar keiner bis zu allen
+			</p>
+		</div>
+	</div>
+
+	<!-- Tier 0 explainer -->
+	<div class="mb-4 rounded-xl border border-border bg-muted/20 p-4">
+		<div class="flex items-start gap-3">
+			<CheckCircle size={20} class="mt-0.5 shrink-0 text-emerald-500" weight="fill" />
+			<div>
+				<p class="font-medium">Lokal (ohne KI) — immer aktiv</p>
+				<p class="mt-1 text-sm text-muted-foreground">
+					Mana funktioniert auch ganz ohne KI: Datum-Erkennung, Suche und einfache Klassifikation
+					laufen über klassische Algorithmen. Manche Funktionen sind dann begrenzt, dafür ist alles
+					100% offline und kostet nichts.
+				</p>
+			</div>
+		</div>
+	</div>
+
+	<!-- Tier 1-3 toggleable cards -->
+	<div class="space-y-3">
+		{#each tierCards as card}
+			{@const enabled = isEnabled(card.tier)}
+			{@const tierBlocked = card.tier === 'browser' && !webgpuSupported}
+			<button
+				type="button"
+				onclick={() => !tierBlocked && toggleTier(card.tier)}
+				disabled={tierBlocked}
+				class="w-full rounded-xl border p-4 text-left transition-all {enabled
+					? 'border-primary bg-primary/5 ring-1 ring-primary/30'
+					: 'border-border bg-card hover:border-primary/40'} {tierBlocked
+					? 'cursor-not-allowed opacity-50'
+					: 'cursor-pointer'}"
+			>
+				<div class="flex items-start gap-3">
+					<div
+						class="flex h-10 w-10 shrink-0 items-center justify-center rounded-lg {enabled
+							? 'bg-primary/20 text-primary'
+							: 'bg-muted text-muted-foreground'}"
+					>
+						<card.icon size={20} />
+					</div>
+					<div class="min-w-0 flex-1">
+						<div class="flex items-center gap-2">
+							<h3 class="font-semibold">{card.title}</h3>
+							{#if enabled}
+								<span
+									class="rounded-full bg-primary px-2 py-0.5 text-[10px] font-medium text-primary-foreground"
+									>aktiv</span
+								>
+							{/if}
+						</div>
+						<p class="mt-0.5 text-sm text-muted-foreground">{card.subtitle}</p>
+						<ul class="mt-2 space-y-1 text-xs text-muted-foreground">
+							{#each card.bullets as bullet}
+								<li class="flex items-start gap-1.5">
+									<span class="mt-0.5 text-primary">•</span>
+									<span>{bullet}</span>
+								</li>
+							{/each}
+						</ul>
+						{#if card.warning}
+							<div
+								class="mt-2 flex items-start gap-1.5 rounded-md bg-amber-500/10 p-2 text-xs text-amber-700 dark:text-amber-400"
+							>
+								<Warning size={12} weight="fill" class="mt-0.5 shrink-0" />
+								<span>{card.warning}</span>
+							</div>
+						{/if}
+
+						<!-- Per-tier extras -->
+						{#if card.tier === 'browser' && enabled && webgpuSupported}
+							<div class="mt-3 flex items-center gap-2 text-xs">
+								{#if browserCacheReady}
+									<span class="text-emerald-500">✓ Modell geladen</span>
+								{:else if localLlmStatus.current.state === 'downloading'}
+									<span class="text-muted-foreground">
+										Lade {defaultModelInfo.displayName} ({(
+											localLlmStatus.current.progress * 100
+										).toFixed(0)}%)…
+									</span>
+								{:else}
+									<button
+										type="button"
+										onclick={(e) => {
+											e.stopPropagation();
+											loadBrowserModel();
+										}}
+										disabled={loadingBrowser}
+										class="rounded-md bg-primary px-3 py-1 text-xs font-medium text-primary-foreground disabled:opacity-50"
+									>
+										{loadingBrowser
+											? 'Lade…'
+											: `Modell laden (~${defaultModelInfo.downloadSizeMb} MB)`}
+									</button>
+								{/if}
+							</div>
+						{/if}
+
+						{#if card.tier === 'browser' && tierBlocked}
+							<p class="mt-2 text-xs text-amber-600 dark:text-amber-400">
+								WebGPU nicht verfügbar in deinem Browser. Funktioniert in Chrome/Edge 113+ oder
+								Safari 18+.
+							</p>
+						{/if}
+
+						{#if card.tier === 'cloud' && enabled && !settings.cloudConsentGiven}
+							<div
+								class="mt-3 rounded-md border border-amber-500/30 bg-amber-500/5 p-3"
+								onclick={(e) => e.stopPropagation()}
+								onkeydown={(e) => e.stopPropagation()}
+								role="presentation"
+							>
+								<p class="text-xs font-medium text-amber-700 dark:text-amber-400">
+									Bestätigung erforderlich
+								</p>
+								<p class="mt-1 text-xs text-muted-foreground">
+									Cloud-Anfragen senden deine Inhalte an Google. Bitte bestätige, dass du das
+									verstanden hast und akzeptierst.
+								</p>
+								<button
+									type="button"
+									onclick={(e) => {
+										e.stopPropagation();
+										setCloudConsent(true);
+									}}
+									class="mt-2 rounded-md bg-amber-600 px-3 py-1 text-xs font-medium text-white hover:bg-amber-700"
+								>
+									Verstanden, Cloud aktivieren
+								</button>
+							</div>
+						{/if}
+
+						{#if card.tier === 'cloud' && enabled && settings.cloudConsentGiven}
+							<div class="mt-3 flex items-center justify-between gap-2 text-xs">
+								<span class="text-emerald-500">✓ Cloud-Zustimmung erteilt</span>
+								<button
+									type="button"
+									onclick={(e) => {
+										e.stopPropagation();
+										setCloudConsent(false);
+									}}
+									class="text-muted-foreground hover:text-foreground"
+								>
+									Zurücknehmen
+								</button>
+							</div>
+						{/if}
+					</div>
+				</div>
+			</button>
+		{/each}
+	</div>
+
+	<!-- Active tier chain summary -->
+	<div class="mt-4 rounded-lg bg-muted/30 px-3 py-2 text-xs text-muted-foreground">
+		<span class="font-medium text-foreground">Aktuelle Reihenfolge: </span>
+		{#if settings.allowedTiers.length === 0}
+			Nur lokal (ohne KI) — die meisten KI-Funktionen sind begrenzt.
+		{:else}
+			{settings.allowedTiers.map((t) => tierLabel(t)).join(' → ')} → Lokal (Fallback)
+		{/if}
+	</div>
+
+	<!-- Behavior toggles -->
+	<div class="mt-6 space-y-3 border-t border-border pt-4">
+		<label class="flex cursor-pointer items-start gap-3">
+			<input
+				type="checkbox"
+				checked={settings.fallbackToRulesOnError}
+				onchange={(e) => setFallback((e.currentTarget as HTMLInputElement).checked)}
+				class="mt-0.5 h-4 w-4 rounded border-border"
+			/>
+			<div>
+				<div class="text-sm font-medium">Bei Fehler auf "Lokal" zurückfallen</div>
+				<div class="text-xs text-muted-foreground">
+					Wenn die gewählte KI-Schicht eine Anfrage nicht beantworten kann, versucht Mana es mit der
+					lokalen Variante (sofern verfügbar). Aus: zeigt stattdessen einen Fehler an.
+				</div>
+			</div>
+		</label>
+
+		<label class="flex cursor-pointer items-start gap-3">
+			<input
+				type="checkbox"
+				checked={settings.showSourceInUi}
+				onchange={(e) => setShowSource((e.currentTarget as HTMLInputElement).checked)}
+				class="mt-0.5 h-4 w-4 rounded border-border"
+			/>
+			<div>
+				<div class="text-sm font-medium">Quelle bei jedem KI-Resultat anzeigen</div>
+				<div class="text-xs text-muted-foreground">
+					Zeigt unter jeder KI-generierten Antwort eine kleine Markierung wie "Auf deinem Gerät"
+					oder "via Google Gemini" — damit du immer siehst, wo deine Daten gerade verarbeitet
+					wurden.
+				</div>
+			</div>
+		</label>
+	</div>
+</div>
diff --git a/apps/mana/apps/web/src/routes/(app)/settings/+page.svelte b/apps/mana/apps/web/src/routes/(app)/settings/+page.svelte
index 8b60acace..0c8ac30ab 100644
--- a/apps/mana/apps/web/src/routes/(app)/settings/+page.svelte
+++ b/apps/mana/apps/web/src/routes/(app)/settings/+page.svelte
@@ -3,6 +3,7 @@
 	import { onMount } from 'svelte';
 	import { Button, Input, Card, PageHeader, GlobalSettingsSection } from '@mana/shared-ui';
 	import { PasskeyManager, TwoFactorSetup, AuditLog, SessionManager } from '@mana/shared-auth-ui';
+	import AiSettings from '$lib/components/settings/AiSettings.svelte';
 	import {
 		User,
 		CurrencyCircleDollar,
@@ -343,6 +344,11 @@
 				</div>
 			</Card>
 
+			<!-- AI Tier Settings -->
+			<Card>
+				<AiSettings />
+			</Card>
+
 			<!-- My Data & Danger Zone -->
 			<Card>
 				<div class="p-6">