diff --git a/mobile/src/app/(tabs)/capture.tsx b/mobile/src/app/(tabs)/capture.tsx
index 5bfd6f6..d8b695b 100644
--- a/mobile/src/app/(tabs)/capture.tsx
+++ b/mobile/src/app/(tabs)/capture.tsx
@@ -6,6 +6,7 @@ import { useNotesStore, type NotesState } from '../../store/notes-store';
 import { useWorkspaceStore, type WorkspaceState } from '../../store/workspace-store';
 import { useIntakeStore, type IntakeState } from '../../store/intake-store';
 import { submitIntake, type IntakeSubmitResult } from '../../api/intake';
+import { buttonA11y, textInputA11y, dynamicType } from '../../lib/accessibility';
 import { colors } from '../../theme';
 
 type CaptureMode = 'text' | 'photo' | 'voice' | 'url' | 'scan' | 'paste';
@@ -133,7 +134,7 @@ export default function CaptureScreen() {
           const isActive = workspace.id === activeWorkspaceId;
           return (
             <Pressable
-              accessibilityLabel={`Select workspace ${workspace.name}`}
+              {...buttonA11y(`Select workspace ${workspace.name}`, { selected: isActive })}
               key={workspace.id}
               onPress={() => setActiveWorkspace(workspace.id)}
               style={[styles.workspaceChip, isActive ? styles.workspaceChipActive : null]}
@@ -153,7 +154,7 @@ export default function CaptureScreen() {
           return (
             <Pressable
               key={m}
-              accessibilityLabel={`${label} capture mode: ${description}`}
+              {...buttonA11y(`${label} capture mode: ${description}`, { selected: isActive })}
               onPress={() => { setMode(m); resetForm(); }}
               style={[styles.modeCard, isActive ? styles.modeCardActive : null]}
             >
@@ -167,28 +168,28 @@ export default function CaptureScreen() {
       {/* Mode-specific content */}
       {mode === 'text' && (
         <>
-          <TextInput value={title} onChangeText={setTitle} placeholder="Draft title" placeholderTextColor={colors.textTertiary} style={styles.input} />
-          <TextInput value={body} onChangeText={setBody} placeholder="Capture a thought, task, or note" placeholderTextColor={colors.textTertiary} style={[styles.input, styles.bodyInput]} multiline textAlignVertical="top" />
+          <TextInput {...textInputA11y('Draft title')} value={title} onChangeText={setTitle} placeholder="Draft title" placeholderTextColor={colors.textTertiary} style={styles.input} />
+          <TextInput {...textInputA11y('Draft body')} value={body} onChangeText={setBody} placeholder="Capture a thought, task, or note" placeholderTextColor={colors.textTertiary} style={[styles.input, styles.bodyInput]} multiline textAlignVertical="top" />
         </>
       )}
 
       {mode === 'url' && (
         <>
-          <TextInput value={urlInput} onChangeText={(t) => { setUrlInput(t); setIntakeResult(null); }} placeholder="https://example.com/article" placeholderTextColor={colors.textTertiary} style={styles.input} autoCapitalize="none" keyboardType="url" />
+          <TextInput {...textInputA11y('URL to process')} value={urlInput} onChangeText={(t) => { setUrlInput(t); setIntakeResult(null); }} placeholder="https://example.com/article" placeholderTextColor={colors.textTertiary} style={styles.input} autoCapitalize="none" keyboardType="url" />
           {intakeResult ? (
             <View style={styles.card}>
               <Text style={styles.cardTitle}>Processing as {intakeResult.contentType}…</Text>
               <Text style={styles.cardBody}>Job: {intakeResult.jobId}</Text>
             </View>
           ) : (
-            <Pressable accessibilityLabel="Process URL with AI" onPress={() => void handleUrlIntake()} disabled={busy || !urlInput.trim()} style={[styles.button, busy ? styles.buttonDisabled : null]}>
-              <Text style={styles.buttonText}>{busy ? 'Submitting...' : 'Process with AI'}</Text>
+            <Pressable {...buttonA11y('Process URL with AI', { disabled: busy || !urlInput.trim() })} onPress={() => void handleUrlIntake()} disabled={busy || !urlInput.trim()} style={[styles.button, (busy || !urlInput.trim()) ? styles.buttonDisabled : null]}>
+              <Text maxFontSizeMultiplier={dynamicType.control} style={styles.buttonText}>{busy ? 'Submitting...' : 'Process with AI'}</Text>
             </Pressable>
           )}
           {body ? (
             <>
-              <TextInput value={title} onChangeText={setTitle} placeholder="Title" placeholderTextColor={colors.textTertiary} style={styles.input} />
-              <TextInput value={body} onChangeText={setBody} placeholder="Processed content" placeholderTextColor={colors.textTertiary} style={[styles.input, styles.bodyInput]} multiline textAlignVertical="top" />
+              <TextInput {...textInputA11y('Processed note title')} value={title} onChangeText={setTitle} placeholder="Title" placeholderTextColor={colors.textTertiary} style={styles.input} />
+              <TextInput {...textInputA11y('Processed note body')} value={body} onChangeText={setBody} placeholder="Processed content" placeholderTextColor={colors.textTertiary} style={[styles.input, styles.bodyInput]} multiline textAlignVertical="top" />
             </>
           ) : null}
         </>
@@ -196,13 +197,13 @@ export default function CaptureScreen() {
 
       {mode === 'paste' && (
         <>
-          <Pressable accessibilityLabel="Read clipboard and clean text" onPress={handlePasteAndClean} disabled={busy} style={[styles.button, busy ? styles.buttonDisabled : null]}>
-            <Text style={styles.buttonText}>{busy ? 'Reading clipboard...' : 'Paste & Clean'}</Text>
+          <Pressable {...buttonA11y('Read clipboard and clean text', { disabled: busy })} onPress={handlePasteAndClean} disabled={busy} style={[styles.button, busy ? styles.buttonDisabled : null]}>
+            <Text maxFontSizeMultiplier={dynamicType.control} style={styles.buttonText}>{busy ? 'Reading clipboard...' : 'Paste & Clean'}</Text>
           </Pressable>
           {body ? (
             <>
-              <TextInput value={title} onChangeText={setTitle} placeholder="Title" placeholderTextColor={colors.textTertiary} style={styles.input} />
-              <TextInput value={body} onChangeText={setBody} placeholder="Cleaned content" placeholderTextColor={colors.textTertiary} style={[styles.input, styles.bodyInput]} multiline textAlignVertical="top" />
+              <TextInput {...textInputA11y('Pasted note title')} value={title} onChangeText={setTitle} placeholder="Title" placeholderTextColor={colors.textTertiary} style={styles.input} />
+              <TextInput {...textInputA11y('Pasted note body')} value={body} onChangeText={setBody} placeholder="Cleaned content" placeholderTextColor={colors.textTertiary} style={[styles.input, styles.bodyInput]} multiline textAlignVertical="top" />
             </>
           ) : null}
         </>
@@ -212,8 +213,8 @@ export default function CaptureScreen() {
         <View style={styles.card}>
           <Text style={styles.cardTitle}>Voice-to-Note</Text>
           <Text style={styles.cardBody}>Record audio and transcribe to text. Requires expo-av for audio recording.</Text>
-          <Pressable accessibilityLabel="Start voice recording" onPress={handleVoiceCapture} style={styles.button}>
-            <Text style={styles.buttonText}>Start Recording</Text>
+          <Pressable {...buttonA11y('Start voice recording')} onPress={handleVoiceCapture} style={styles.button}>
+            <Text maxFontSizeMultiplier={dynamicType.control} style={styles.buttonText}>Start Recording</Text>
           </Pressable>
         </View>
       )}
@@ -222,8 +223,8 @@ export default function CaptureScreen() {
         <View style={styles.card}>
           <Text style={styles.cardTitle}>Screenshot-to-Note</Text>
           <Text style={styles.cardBody}>Take a photo or select from gallery. Uses vision AI for OCR and text extraction.</Text>
-          <Pressable accessibilityLabel="Open camera for photo capture" onPress={handlePhotoCapture} style={styles.button}>
-            <Text style={styles.buttonText}>Open Camera</Text>
+          <Pressable {...buttonA11y('Open camera for photo capture')} onPress={handlePhotoCapture} style={styles.button}>
+            <Text maxFontSizeMultiplier={dynamicType.control} style={styles.buttonText}>Open Camera</Text>
           </Pressable>
         </View>
       )}
@@ -232,8 +233,8 @@ export default function CaptureScreen() {
         <View style={styles.card}>
           <Text style={styles.cardTitle}>Document Scan</Text>
           <Text style={styles.cardBody}>Photograph multiple pages of a document. Each page is processed with vision AI and combined into a single note.</Text>
-          <Pressable accessibilityLabel="Start document scan" onPress={handleScanCapture} style={styles.button}>
-            <Text style={styles.buttonText}>Start Scanning</Text>
+          <Pressable {...buttonA11y('Start document scan')} onPress={handleScanCapture} style={styles.button}>
+            <Text maxFontSizeMultiplier={dynamicType.control} style={styles.buttonText}>Start Scanning</Text>
           </Pressable>
         </View>
       )}
@@ -244,12 +245,12 @@ export default function CaptureScreen() {
       {/* Save button (shown when we have content to save) */}
       {(mode === 'text' || body) && (
         <Pressable
-          accessibilityLabel={activeWorkspaceId ? 'Save draft note' : 'Select workspace before saving'}
+          {...buttonA11y(activeWorkspaceId ? 'Save draft note' : 'Select workspace before saving', { disabled: !activeWorkspaceId || busy })}
           onPress={handleSave}
           disabled={!activeWorkspaceId || busy}
           style={[styles.button, (!activeWorkspaceId || busy) ? styles.buttonDisabled : null]}
         >
-          <Text style={styles.buttonText}>{busy ? 'Saving...' : activeWorkspaceId ? 'Save draft' : 'Select workspace'}</Text>
+          <Text maxFontSizeMultiplier={dynamicType.control} style={styles.buttonText}>{busy ? 'Saving...' : activeWorkspaceId ? 'Save draft' : 'Select workspace'}</Text>
         </Pressable>
       )}
       {saved ? <Text style={styles.saved}>Draft saved to the product backend.</Text> : null}
diff --git a/mobile/src/app/(tabs)/capture/scan.tsx b/mobile/src/app/(tabs)/capture/scan.tsx
index 186ca28..000e822 100644
--- a/mobile/src/app/(tabs)/capture/scan.tsx
+++ b/mobile/src/app/(tabs)/capture/scan.tsx
@@ -1,6 +1,7 @@
 import { useState } from 'react';
 import { View, Text, TouchableOpacity, StyleSheet } from 'react-native';
 import { useRouter } from 'expo-router';
+import { buttonA11y, dynamicType } from '../../../lib/accessibility';
 import { colors } from '../../../theme';
 
 export default function ScanCaptureScreen() {
@@ -13,9 +14,9 @@ export default function ScanCaptureScreen() {
       <Text style={styles.hint}>Use your camera to scan a multi-page document. Text will be extracted via OCR.</Text>
 
       <TouchableOpacity
+        {...buttonA11y(scanning ? 'Stop scanning' : 'Start scanning', { selected: scanning })}
         style={[styles.scanBtn, scanning && styles.scanBtnActive]}
         onPress={() => setScanning(!scanning)}
-        accessibilityLabel={scanning ? 'Stop scanning' : 'Start scanning'}
       >
         <Text style={styles.scanIcon}>{scanning ? '⏹' : '📄'}</Text>
         <Text style={styles.scanLabel}>{scanning ? 'Stop' : 'Scan Document'}</Text>
@@ -25,8 +26,8 @@ export default function ScanCaptureScreen() {
         Camera-based document scanning will be available in a future release. For now, use the Text or URL capture modes.
       </Text>
 
-      <TouchableOpacity style={styles.backBtn} onPress={() => router.back()}>
-        <Text style={styles.backBtnText}>Go Back</Text>
+      <TouchableOpacity {...buttonA11y('Go back')} style={styles.backBtn} onPress={() => router.back()}>
+        <Text maxFontSizeMultiplier={dynamicType.control} style={styles.backBtnText}>Go Back</Text>
       </TouchableOpacity>
     </View>
   );
diff --git a/mobile/src/app/(tabs)/capture/url.tsx b/mobile/src/app/(tabs)/capture/url.tsx
index ec13e74..b4a43c4 100644
--- a/mobile/src/app/(tabs)/capture/url.tsx
+++ b/mobile/src/app/(tabs)/capture/url.tsx
@@ -4,6 +4,7 @@ import { useRouter } from 'expo-router';
 import { submitIntake, type IntakeSubmitResult } from '../../../api/intake';
 import { useWorkspaceStore, type WorkspaceState } from '../../../store/workspace-store';
 import { useIntakeStore, type IntakeState } from '../../../store/intake-store';
+import { buttonA11y, textInputA11y, dynamicType } from '../../../lib/accessibility';
 import { colors } from '../../../theme';
 
 function classifyUrlLocal(url: string): string {
@@ -63,7 +64,7 @@ export default function UrlCaptureScreen() {
         onChangeText={(text) => { setUrl(text); setResult(null); setError(null); }}
         autoCapitalize="none"
         keyboardType="url"
-        accessibilityLabel="URL input"
+        {...textInputA11y('URL input')}
       />
 
       {detectedType && (
@@ -86,24 +87,24 @@ export default function UrlCaptureScreen() {
       ) : (
         <View style={styles.buttonRow}>
           <Pressable
+            {...buttonA11y('Process URL with AI', { disabled: busy || !url.trim() })}
             style={[styles.btn, (busy || !url.trim()) && styles.btnDisabled]}
             disabled={busy || !url.trim()}
             onPress={() => void handleProcess()}
-            accessibilityLabel="Process URL with AI"
           >
             {busy ? (
               <ActivityIndicator color={colors.textPrimary} size="small" />
             ) : (
-              <Text style={styles.btnText}>Process with AI</Text>
+              <Text maxFontSizeMultiplier={dynamicType.control} style={styles.btnText}>Process with AI</Text>
             )}
           </Pressable>
           <Pressable
+            {...buttonA11y('Advanced intake options', { disabled: !url.trim() })}
             style={styles.secondaryBtn}
             disabled={!url.trim()}
             onPress={handleAdvanced}
-            accessibilityLabel="Advanced intake options"
           >
-            <Text style={styles.secondaryBtnText}>Options…</Text>
+            <Text maxFontSizeMultiplier={dynamicType.control} style={styles.secondaryBtnText}>Options…</Text>
           </Pressable>
         </View>
       )}
diff --git a/mobile/src/app/(tabs)/capture/voice.tsx b/mobile/src/app/(tabs)/capture/voice.tsx
index b31e38f..84dcf07 100644
--- a/mobile/src/app/(tabs)/capture/voice.tsx
+++ b/mobile/src/app/(tabs)/capture/voice.tsx
@@ -1,6 +1,7 @@
 import { useState } from 'react';
 import { View, Text, TouchableOpacity, StyleSheet } from 'react-native';
 import { useRouter } from 'expo-router';
+import { buttonA11y, dynamicType } from '../../../lib/accessibility';
 import { colors } from '../../../theme';
 
 export default function VoiceCaptureScreen() {
@@ -14,9 +15,9 @@ export default function VoiceCaptureScreen() {
       <Text style={styles.hint}>Tap the microphone to start recording. Speech will be transcribed automatically.</Text>
 
       <TouchableOpacity
+        {...buttonA11y(recording ? 'Stop recording' : 'Start recording', { selected: recording })}
         style={[styles.micBtn, recording && styles.micBtnActive]}
         onPress={() => setRecording(!recording)}
-        accessibilityLabel={recording ? 'Stop recording' : 'Start recording'}
       >
         <Text style={styles.micIcon}>{recording ? '⏹' : '🎙'}</Text>
         <Text style={styles.micLabel}>{recording ? 'Stop' : 'Record'}</Text>
@@ -27,8 +28,8 @@ export default function VoiceCaptureScreen() {
           <View style={styles.transcriptBox}>
             <Text style={styles.transcriptText}>{transcript}</Text>
           </View>
-          <TouchableOpacity style={styles.saveBtn} onPress={() => router.back()}>
-            <Text style={styles.saveBtnText}>Save as Note</Text>
+          <TouchableOpacity {...buttonA11y('Save transcript as note')} style={styles.saveBtn} onPress={() => router.back()}>
+            <Text maxFontSizeMultiplier={dynamicType.control} style={styles.saveBtnText}>Save as Note</Text>
           </TouchableOpacity>
         </>
       )}
diff --git a/mobile/src/app/(tabs)/inbox.tsx b/mobile/src/app/(tabs)/inbox.tsx
index 8645e30..590a807 100644
--- a/mobile/src/app/(tabs)/inbox.tsx
+++ b/mobile/src/app/(tabs)/inbox.tsx
@@ -1,6 +1,7 @@
 import { useEffect, useState } from 'react';
 import { Pressable, StyleSheet, Text, TextInput, View } from 'react-native';
 import { useInboxStore, type ActivityItem, type ApprovalItem, type InboxState } from '../../store/inbox-store';
+import { buttonA11y, textInputA11y, dynamicType } from '../../lib/accessibility';
 import { colors } from '../../theme';
 
 export default function InboxScreen() {
@@ -24,6 +25,7 @@ export default function InboxScreen() {
       {isLoading ? <Text style={styles.empty}>Loading approvals…</Text> : null}
       {approvals.length > 0 ? (
         <TextInput
+          {...textInputA11y('Review note')}
           style={styles.reviewNoteInput}
           placeholder="Optional review note…"
           placeholderTextColor={colors.textSecondary}
@@ -40,7 +42,7 @@ export default function InboxScreen() {
           <Text style={styles.status}>Status: {item.status}</Text>
           <View style={styles.actionRow}>
             <Pressable
-              accessibilityLabel={`Approve ${item.title}`}
+              {...buttonA11y(`Approve ${item.title}`, { disabled: pendingApprovalId === item.id || item.status !== 'pending' })}
               style={[
                 styles.approveButton,
                 pendingApprovalId === item.id || item.status !== 'pending' ? styles.buttonDisabled : null,
@@ -57,12 +59,12 @@ export default function InboxScreen() {
                 }
               }}
             >
-              <Text style={styles.approveText}>
+              <Text maxFontSizeMultiplier={dynamicType.control} style={styles.approveText}>
                 {pendingApprovalId === item.id ? 'Approving…' : 'Approve'}
               </Text>
             </Pressable>
             <Pressable
-              accessibilityLabel={`Reject ${item.title}`}
+              {...buttonA11y(`Reject ${item.title}`, { disabled: pendingApprovalId === item.id || item.status !== 'pending' })}
               style={[
                 styles.rejectButton,
                 pendingApprovalId === item.id || item.status !== 'pending' ? styles.buttonDisabled : null,
@@ -79,7 +81,7 @@ export default function InboxScreen() {
                 }
               }}
             >
-              <Text style={styles.rejectText}>
+              <Text maxFontSizeMultiplier={dynamicType.control} style={styles.rejectText}>
                 {pendingApprovalId === item.id ? 'Rejecting…' : 'Reject'}
               </Text>
             </Pressable>
diff --git a/mobile/src/app/(tabs)/index.tsx b/mobile/src/app/(tabs)/index.tsx
index e6d5753..0449f02 100644
--- a/mobile/src/app/(tabs)/index.tsx
+++ b/mobile/src/app/(tabs)/index.tsx
@@ -5,6 +5,7 @@ import type { MobileNote } from '../../api/notes';
 import { useNotesStore, type NotesState } from '../../store/notes-store';
 import { useWorkspaceStore, type WorkspaceState } from '../../store/workspace-store';
 import type { MobileWorkspace } from '../../api/workspaces';
+import { buttonA11y } from '../../lib/accessibility';
 import { colors } from '../../theme';
 
 export default function HomeScreen() {
@@ -41,7 +42,7 @@ export default function HomeScreen() {
       </View>
       <ScrollView horizontal showsHorizontalScrollIndicator={false} contentContainerStyle={styles.workspaceRow}>
         <Pressable
-          accessibilityLabel="Show all workspaces"
+          {...buttonA11y('Show all workspaces', { selected: activeWorkspaceId === null })}
           onPress={() => setActiveWorkspace(null)}
           style={[styles.workspaceChip, activeWorkspaceId === null ? styles.workspaceChipActive : null]}
         >
@@ -54,7 +55,7 @@ export default function HomeScreen() {
 
           return (
             <Pressable
-              accessibilityLabel={`Filter by ${workspace.name}`}
+              {...buttonA11y(`Filter by ${workspace.name}`, { selected: isActive })}
               key={workspace.id}
               onPress={() => setActiveWorkspace(workspace.id)}
               style={[styles.workspaceChip, isActive ? styles.workspaceChipActive : null]}
@@ -69,7 +70,7 @@ export default function HomeScreen() {
 
       {isLoading ? <Text style={styles.empty}>Loading notes…</Text> : null}
       {recentNotes.map((note: (typeof recentNotes)[number]) => (
-        <Pressable accessibilityLabel={`Open note ${note.title}`} key={note.id} onPress={() => router.push(`/note/${note.id}`)} style={styles.card}>
+        <Pressable {...buttonA11y(`Open note ${note.title}`)} key={note.id} onPress={() => router.push(`/note/${note.id}`)} style={styles.card}>
           <View style={styles.badgeRow}>
             <Text style={styles.badge}>{note.workspace}</Text>
           </View>
diff --git a/mobile/src/app/(tabs)/search.tsx b/mobile/src/app/(tabs)/search.tsx
index ea5f1dd..d333fa1 100644
--- a/mobile/src/app/(tabs)/search.tsx
+++ b/mobile/src/app/(tabs)/search.tsx
@@ -5,6 +5,7 @@ import type { MobileNote } from '../../api/notes';
 import type { MobileWorkspace } from '../../api/workspaces';
 import { useNotesStore, type NotesState } from '../../store/notes-store';
 import { useWorkspaceStore, type WorkspaceState } from '../../store/workspace-store';
+import { buttonA11y, textInputA11y } from '../../lib/accessibility';
 import { colors } from '../../theme';
 
 export default function SearchScreen() {
@@ -39,7 +40,7 @@ export default function SearchScreen() {
       <Text style={styles.title}>Search</Text>
       <Text style={styles.scope}>Scope: {activeWorkspaceName ?? 'All workspaces'}</Text>
       <TextInput
-        accessibilityLabel="Search notes"
+        {...textInputA11y('Search notes')}
         value={query}
         onChangeText={setQuery}
         placeholder="Search notes"
@@ -49,7 +50,7 @@ export default function SearchScreen() {
       <View style={styles.list}>
         {isLoading ? <Text style={styles.empty}>Loading searchable notes…</Text> : null}
         {results.map((note: MobileNote) => (
-          <Pressable accessibilityLabel={`Open note ${note.title}`} key={note.id} onPress={() => router.push(`/note/${note.id}`)} style={styles.row}>
+          <Pressable {...buttonA11y(`Open note ${note.title}`)} key={note.id} onPress={() => router.push(`/note/${note.id}`)} style={styles.row}>
             <Text style={styles.rowText}>{note.title}</Text>
           </Pressable>
         ))}
diff --git a/mobile/src/app/(tabs)/settings.tsx b/mobile/src/app/(tabs)/settings.tsx
index 49b8a6f..c764126 100644
--- a/mobile/src/app/(tabs)/settings.tsx
+++ b/mobile/src/app/(tabs)/settings.tsx
@@ -4,6 +4,7 @@ import { router } from 'expo-router';
 import { useAuthStore, type AuthState } from '../../store/auth-store';
 import { getFeedbackClient } from '../../lib/feedback-client';
 import { APP_PLATFORM } from '../../lib/app-metadata';
+import { buttonA11y, textInputA11y, dynamicType } from '../../lib/accessibility';
 import { colors } from '../../theme';
 
 type FeedbackType = 'bug' | 'feature' | 'praise' | 'other';
@@ -50,14 +51,14 @@ export default function SettingsScreen() {
         <Text style={styles.metaLabel}>Signed in as</Text>
         <Text style={styles.metaValue}>{email ?? 'Unknown account'}</Text>
         <Pressable
-          accessibilityLabel="Sign out"
+          {...buttonA11y('Sign out')}
           style={styles.secondaryButton}
           onPress={() => {
             signOut();
             router.replace('/auth');
           }}
         >
-          <Text style={styles.secondaryButtonText}>Sign out</Text>
+          <Text maxFontSizeMultiplier={dynamicType.control} style={styles.secondaryButtonText}>Sign out</Text>
         </Pressable>
       </View>
 
@@ -68,7 +69,7 @@ export default function SettingsScreen() {
             const isActive = type === feedbackType;
             return (
               <Pressable
-                accessibilityLabel={`Select ${type} feedback type`}
+                {...buttonA11y(`Select ${type} feedback type`, { selected: isActive })}
                 key={type}
                 style={[styles.typeChip, isActive ? styles.typeChipActive : null]}
                 onPress={() => setFeedbackType(type)}
@@ -80,6 +81,7 @@ export default function SettingsScreen() {
         </View>
 
         <TextInput
+          {...textInputA11y('Feedback title')}
           value={feedbackTitle}
           onChangeText={setFeedbackTitle}
           placeholder="Feedback title"
@@ -87,6 +89,7 @@ export default function SettingsScreen() {
           style={styles.input}
         />
         <TextInput
+          {...textInputA11y('Feedback details')}
           value={feedbackBody}
           onChangeText={setFeedbackBody}
           placeholder="Details (optional)"
@@ -97,14 +100,14 @@ export default function SettingsScreen() {
         />
 
         <Pressable
-          accessibilityLabel={isSubmitting ? 'Submitting feedback' : 'Submit feedback'}
+          {...buttonA11y(isSubmitting ? 'Submitting feedback' : 'Submit feedback', { disabled: feedbackTitle.trim().length === 0 || isSubmitting })}
           style={[styles.primaryButton, feedbackTitle.trim().length === 0 || isSubmitting ? styles.buttonDisabled : null]}
           disabled={feedbackTitle.trim().length === 0 || isSubmitting}
           onPress={() => {
             void submitFeedback();
           }}
         >
-          <Text style={styles.primaryButtonText}>{isSubmitting ? 'Submitting…' : 'Submit feedback'}</Text>
+          <Text maxFontSizeMultiplier={dynamicType.control} style={styles.primaryButtonText}>{isSubmitting ? 'Submitting…' : 'Submit feedback'}</Text>
         </Pressable>
       </View>
     </ScrollView>
diff --git a/mobile/src/app/_layout.tsx b/mobile/src/app/_layout.tsx
index 7435207..2bebaef 100644
--- a/mobile/src/app/_layout.tsx
+++ b/mobile/src/app/_layout.tsx
@@ -13,6 +13,7 @@ import { getSurveyClient } from '../lib/survey-client';
 import { flushNoteQueue, getNoteQueueSize } from '../lib/offline-queue';
 import type { InAppMessage } from '@bytelyst/broadcast-client';
 import type { ActiveSurvey, Question, QuestionAnswer } from '@bytelyst/survey-client';
+import { buttonA11y, textInputA11y, dynamicType } from '../lib/accessibility';
 import { colors } from '../theme';
 
 export default function RootLayout() {
@@ -268,8 +269,8 @@ export default function RootLayout() {
                 {message.body ? <Text style={styles.bannerBody}>{message.body}</Text> : null}
               </View>
               {message.dismissible !== false ? (
-                <Pressable onPress={() => void dismissBroadcast(message.id)}>
-                  <Text style={styles.bannerDismiss}>×</Text>
+                <Pressable {...buttonA11y(`Dismiss ${message.title}`)} onPress={() => void dismissBroadcast(message.id)}>
+                  <Text maxFontSizeMultiplier={dynamicType.control} style={styles.bannerDismiss}>×</Text>
                 </Pressable>
               ) : null}
             </View>
@@ -289,11 +290,11 @@ export default function RootLayout() {
         <View style={styles.surveyPrompt}>
           <Text style={styles.surveyPromptText}>{activeSurvey.title}</Text>
           <View style={styles.surveyActions}>
-            <Pressable style={styles.primaryButton} onPress={() => void startSurvey()}>
-              <Text style={styles.primaryButtonText}>Start</Text>
+            <Pressable {...buttonA11y(`Start survey ${activeSurvey.title}`)} style={styles.primaryButton} onPress={() => void startSurvey()}>
+              <Text maxFontSizeMultiplier={dynamicType.control} style={styles.primaryButtonText}>Start</Text>
             </Pressable>
-            <Pressable style={styles.secondaryButton} onPress={() => void dismissSurvey()}>
-              <Text style={styles.secondaryButtonText}>Dismiss</Text>
+            <Pressable {...buttonA11y(`Dismiss survey ${activeSurvey.title}`)} style={styles.secondaryButton} onPress={() => void dismissSurvey()}>
+              <Text maxFontSizeMultiplier={dynamicType.control} style={styles.secondaryButtonText}>Dismiss</Text>
             </Pressable>
           </View>
         </View>
@@ -322,10 +323,11 @@ export default function RootLayout() {
                 {currentQuestion.options.map((option) => (
                   <Pressable
                     key={option.id}
+                    {...buttonA11y(`Answer ${option.text}`)}
                     style={styles.optionButton}
                     onPress={() => void submitAnswer(option.id)}
                   >
-                    <Text style={styles.optionText}>{option.emoji ? `${option.emoji} ` : ''}{option.text}</Text>
+                    <Text maxFontSizeMultiplier={dynamicType.control} style={styles.optionText}>{option.emoji ? `${option.emoji} ` : ''}{option.text}</Text>
                   </Pressable>
                 ))}
               </ScrollView>
@@ -335,14 +337,15 @@ export default function RootLayout() {
                   { length: (currentQuestion.maxValue ?? 5) - (currentQuestion.minValue ?? 1) + 1 },
                   (_, index) => (currentQuestion.minValue ?? 1) + index,
                 ).map((value) => (
-                  <Pressable key={value} style={styles.ratingButton} onPress={() => void submitAnswer(String(value))}>
-                    <Text style={styles.ratingText}>{value}</Text>
+                  <Pressable key={value} {...buttonA11y(`Rate ${value}`)} style={styles.ratingButton} onPress={() => void submitAnswer(String(value))}>
+                    <Text maxFontSizeMultiplier={dynamicType.control} style={styles.ratingText}>{value}</Text>
                   </Pressable>
                 ))}
               </View>
             ) : (
               <>
                 <TextInput
+                  {...textInputA11y('Survey answer')}
                   value={textAnswer}
                   onChangeText={setTextAnswer}
                   placeholder="Your answer"
@@ -351,17 +354,18 @@ export default function RootLayout() {
                   multiline={currentQuestion?.type === 'text_long'}
                 />
                 <Pressable
+                  {...buttonA11y('Submit survey answer', { disabled: textAnswer.trim().length === 0 })}
                   style={[styles.primaryButton, textAnswer.trim().length === 0 ? styles.disabledButton : null]}
                   disabled={textAnswer.trim().length === 0}
                   onPress={() => void submitAnswer(textAnswer.trim())}
                 >
-                  <Text style={styles.primaryButtonText}>Next</Text>
+                  <Text maxFontSizeMultiplier={dynamicType.control} style={styles.primaryButtonText}>Next</Text>
                 </Pressable>
               </>
             )}
 
-            <Pressable style={styles.secondaryButton} onPress={() => void dismissSurvey()}>
-              <Text style={styles.secondaryButtonText}>Close</Text>
+            <Pressable {...buttonA11y('Close survey')} style={styles.secondaryButton} onPress={() => void dismissSurvey()}>
+              <Text maxFontSizeMultiplier={dynamicType.control} style={styles.secondaryButtonText}>Close</Text>
             </Pressable>
           </View>
         </View>
diff --git a/mobile/src/app/auth.tsx b/mobile/src/app/auth.tsx
index c8bbb98..9952beb 100644
--- a/mobile/src/app/auth.tsx
+++ b/mobile/src/app/auth.tsx
@@ -2,6 +2,7 @@ import { useEffect, useState } from 'react';
 import { Pressable, StyleSheet, Text, TextInput, View } from 'react-native';
 import { router } from 'expo-router';
 import { useAuthStore, type AuthState } from '../store/auth-store';
+import { buttonA11y, textInputA11y, dynamicType } from '../lib/accessibility';
 import { colors } from '../theme';
 
 export default function AuthScreen() {
@@ -27,6 +28,7 @@ export default function AuthScreen() {
       <Text style={styles.subtitle}>{mode === 'signin' ? 'Sign in to continue' : 'Create your account'}</Text>
       {mode === 'register' ? (
         <TextInput
+          {...textInputA11y('Display name')}
           autoCapitalize="words"
           onChangeText={(value: string) => {
             setErrorMessage(null);
@@ -39,6 +41,7 @@ export default function AuthScreen() {
         />
       ) : null}
       <TextInput
+        {...textInputA11y('Email address')}
         autoCapitalize="none"
         keyboardType="email-address"
         onChangeText={(value: string) => {
@@ -51,6 +54,7 @@ export default function AuthScreen() {
         value={email}
       />
       <TextInput
+        {...textInputA11y('Password')}
         onChangeText={(value: string) => {
           setErrorMessage(null);
           setPassword(value);
@@ -63,7 +67,8 @@ export default function AuthScreen() {
       />
       {errorMessage ? <Text style={styles.errorText}>{errorMessage}</Text> : null}
       <Pressable
-        accessibilityLabel={mode === 'signin' ? 'Sign in' : 'Register account'}
+        {...buttonA11y(mode === 'signin' ? 'Sign in' : 'Register account', { disabled: isLoading })}
+        disabled={isLoading}
         onPress={async () => {
           const didAuthenticate =
             mode === 'signin'
@@ -81,21 +86,21 @@ export default function AuthScreen() {
               : 'Registration failed. Check your details or connection and try again.',
           );
         }}
-        style={styles.button}
+        style={[styles.button, isLoading ? styles.buttonDisabled : null]}
       >
-        <Text style={styles.buttonText}>
+        <Text maxFontSizeMultiplier={dynamicType.control} style={styles.buttonText}>
           {isLoading ? (mode === 'signin' ? 'Signing in…' : 'Creating account…') : mode === 'signin' ? 'Sign in' : 'Register'}
         </Text>
       </Pressable>
       <Pressable
-        accessibilityLabel={mode === 'signin' ? 'Switch to register mode' : 'Switch to sign in mode'}
+        {...buttonA11y(mode === 'signin' ? 'Switch to register mode' : 'Switch to sign in mode')}
         onPress={() => {
           setErrorMessage(null);
           setMode((current) => (current === 'signin' ? 'register' : 'signin'));
         }}
         style={styles.modeSwitch}
       >
-        <Text style={styles.modeSwitchText}>
+        <Text maxFontSizeMultiplier={dynamicType.control} style={styles.modeSwitchText}>
           {mode === 'signin' ? 'Need an account? Register' : 'Already have an account? Sign in'}
         </Text>
       </Pressable>
@@ -137,6 +142,9 @@ const styles = StyleSheet.create({
     paddingVertical: 14,
     alignItems: 'center',
   },
+  buttonDisabled: {
+    opacity: 0.55,
+  },
   buttonText: {
     color: colors.textPrimary,
     fontWeight: '700',
diff --git a/mobile/src/app/intake.tsx b/mobile/src/app/intake.tsx
index ddca6da..ec90951 100644
--- a/mobile/src/app/intake.tsx
+++ b/mobile/src/app/intake.tsx
@@ -6,6 +6,7 @@ import { listPromptTemplates, type MobilePromptTemplate } from '../api/note-prom
 import { useWorkspaceStore, type WorkspaceState } from '../store/workspace-store';
 import { useIntakeStore, type IntakeState } from '../store/intake-store';
 import type { MobileWorkspace } from '../api/workspaces';
+import { buttonA11y, dynamicType } from '../lib/accessibility';
 import { colors } from '../theme';
 
 type ContentTypeBadge = { label: string; color: string };
@@ -157,7 +158,7 @@ export default function IntakeScreen() {
           <Text style={styles.label}>Template</Text>
           <ScrollView horizontal showsHorizontalScrollIndicator={false} contentContainerStyle={styles.chipRow}>
             <Pressable
-              accessibilityLabel="Auto-select template"
+              {...buttonA11y('Auto-select template', { selected: selectedTemplate === null })}
               onPress={() => setSelectedTemplate(null)}
               style={[styles.chip, selectedTemplate === null ? styles.chipActive : null]}
             >
@@ -168,7 +169,7 @@ export default function IntakeScreen() {
             {templates.slice(0, 8).map((t) => (
               <Pressable
                 key={t.id}
-                accessibilityLabel={`Select template ${t.name}`}
+                {...buttonA11y(`Select template ${t.name}`, { selected: selectedTemplate === t.slug })}
                 onPress={() => setSelectedTemplate(t.slug)}
                 style={[styles.chip, selectedTemplate === t.slug ? styles.chipActive : null]}
               >
@@ -198,7 +199,7 @@ export default function IntakeScreen() {
       {/* Process button */}
       {!result && (
         <Pressable
-          accessibilityLabel="Process URL with intake pipeline"
+          {...buttonA11y('Process URL with intake pipeline', { disabled: busy || !incomingUrl.trim() })}
           onPress={() => void handleProcess()}
           disabled={busy || !incomingUrl.trim()}
           style={[styles.button, (busy || !incomingUrl.trim()) ? styles.buttonDisabled : null]}
@@ -206,7 +207,7 @@ export default function IntakeScreen() {
           {busy ? (
             <ActivityIndicator color={colors.textPrimary} size="small" />
           ) : (
-            <Text style={styles.buttonText}>Process</Text>
+            <Text maxFontSizeMultiplier={dynamicType.control} style={styles.buttonText}>Process</Text>
           )}
         </Pressable>
       )}
diff --git a/mobile/src/app/note/[id].tsx b/mobile/src/app/note/[id].tsx
index b693bd4..c2fa980 100644
--- a/mobile/src/app/note/[id].tsx
+++ b/mobile/src/app/note/[id].tsx
@@ -4,6 +4,7 @@ import { ActivityIndicator, Pressable, ScrollView, Share, StyleSheet, Text, Text
 import { useNotesStore, type NotesState } from '../../store/notes-store';
 import { usePromptStore, type PromptState } from '../../store/prompt-store';
 import { getReadingTime, suggestTags } from '../../api/note-prompts';
+import { buttonA11y, textInputA11y, dynamicType } from '../../lib/accessibility';
 import { colors } from '../../theme';
 
 export default function NoteDetailScreen() {
@@ -53,6 +54,7 @@ export default function NoteDetailScreen() {
         {isEditing ? (
           <>
             <TextInput
+              {...textInputA11y('Note title')}
               value={draftTitle}
               onChangeText={setDraftTitle}
               style={styles.input}
@@ -60,6 +62,7 @@ export default function NoteDetailScreen() {
               placeholderTextColor={colors.textTertiary}
             />
             <TextInput
+              {...textInputA11y('Note body')}
               value={draftBody}
               onChangeText={setDraftBody}
               style={[styles.input, styles.bodyInput]}
@@ -70,7 +73,7 @@ export default function NoteDetailScreen() {
             />
             <View style={styles.actionRow}>
               <Pressable
-                accessibilityLabel="Cancel editing"
+                {...buttonA11y('Cancel editing')}
                 style={styles.secondaryButton}
                 onPress={() => {
                   setIsEditing(false);
@@ -78,25 +81,25 @@ export default function NoteDetailScreen() {
                   setDraftBody(selectedNote?.body ?? '');
                 }}
               >
-                <Text style={styles.secondaryButtonText}>Cancel</Text>
+                <Text maxFontSizeMultiplier={dynamicType.control} style={styles.secondaryButtonText}>Cancel</Text>
               </Pressable>
               <Pressable
-                accessibilityLabel="Save note changes"
+                {...buttonA11y('Save note changes')}
                 style={styles.primaryButton}
                 onPress={async () => {
                   await updateNote(noteId, draftTitle, draftBody);
                   setIsEditing(false);
                 }}
               >
-                <Text style={styles.primaryButtonText}>Save</Text>
+                <Text maxFontSizeMultiplier={dynamicType.control} style={styles.primaryButtonText}>Save</Text>
               </Pressable>
             </View>
           </>
         ) : !isLoading ? (
           <>
             <Text style={styles.body}>{selectedNote?.body ?? 'No note body is available yet.'}</Text>
-            <Pressable accessibilityLabel="Edit note" style={styles.primaryButton} onPress={() => setIsEditing(true)}>
-              <Text style={styles.primaryButtonText}>Edit note</Text>
+            <Pressable {...buttonA11y('Edit note')} style={styles.primaryButton} onPress={() => setIsEditing(true)}>
+              <Text maxFontSizeMultiplier={dynamicType.control} style={styles.primaryButtonText}>Edit note</Text>
             </Pressable>
           </>
         ) : null}
@@ -115,7 +118,7 @@ export default function NoteDetailScreen() {
           <Text style={styles.sectionTitle}>Share</Text>
           <View style={styles.actionRow}>
             <Pressable
-              accessibilityLabel="Share note as text"
+              {...buttonA11y('Share note as text')}
               style={styles.secondaryButton}
               onPress={() => {
                 void Share.share({
@@ -124,10 +127,10 @@ export default function NoteDetailScreen() {
                 });
               }}
             >
-              <Text style={styles.secondaryButtonText}>Share as text</Text>
+              <Text maxFontSizeMultiplier={dynamicType.control} style={styles.secondaryButtonText}>Share as text</Text>
             </Pressable>
             <Pressable
-              accessibilityLabel="Share deep link to note"
+              {...buttonA11y('Share deep link to note')}
               style={styles.secondaryButton}
               onPress={() => {
                 void Share.share({
@@ -136,7 +139,7 @@ export default function NoteDetailScreen() {
                 });
               }}
             >
-              <Text style={styles.secondaryButtonText}>Share link</Text>
+              <Text maxFontSizeMultiplier={dynamicType.control} style={styles.secondaryButtonText}>Share link</Text>
             </Pressable>
           </View>
         </View>
@@ -145,7 +148,7 @@ export default function NoteDetailScreen() {
       {/* Smart Actions */}
       <View style={styles.card}>
         <Pressable
-          accessibilityLabel="Toggle Smart Actions"
+          {...buttonA11y('Toggle Smart Actions', { expanded: showSmartActions })}
           style={styles.actionRow}
           onPress={() => {
             setShowSmartActions(!showSmartActions);
@@ -170,7 +173,7 @@ export default function NoteDetailScreen() {
             )}
 
             <Pressable
-              accessibilityLabel="Suggest tags"
+              {...buttonA11y('Suggest tags')}
               style={styles.secondaryButton}
               onPress={() => {
                 if (!selectedNote) return;
@@ -179,7 +182,7 @@ export default function NoteDetailScreen() {
                   .catch(() => {});
               }}
             >
-              <Text style={styles.secondaryButtonText}>Suggest tags</Text>
+              <Text maxFontSizeMultiplier={dynamicType.control} style={styles.secondaryButtonText}>Suggest tags</Text>
             </Pressable>
 
             {suggestedTags.length > 0 && (
@@ -195,7 +198,7 @@ export default function NoteDetailScreen() {
             {templates.slice(0, 6).map((t) => (
               <Pressable
                 key={t.id}
-                accessibilityLabel={`Run: ${t.name}`}
+                {...buttonA11y(`Run: ${t.name}`, { disabled: isRunning || !selectedNote })}
                 style={[styles.secondaryButton, isRunning ? { opacity: 0.5 } : null]}
                 disabled={isRunning || !selectedNote}
                 onPress={() => {
@@ -207,7 +210,7 @@ export default function NoteDetailScreen() {
                   });
                 }}
               >
-                <Text style={styles.secondaryButtonText}>{t.name}</Text>
+                <Text maxFontSizeMultiplier={dynamicType.control} style={styles.secondaryButtonText}>{t.name}</Text>
                 <Text style={[styles.body, { fontSize: 12 }]}>{t.description}</Text>
               </Pressable>
             ))}
@@ -228,8 +231,8 @@ export default function NoteDetailScreen() {
                     {lastResult.model} · {lastResult.usage?.totalTokens ?? 0} tokens
                   </Text>
                 )}
-                <Pressable accessibilityLabel="Dismiss result" style={styles.secondaryButton} onPress={clearResult}>
-                  <Text style={styles.secondaryButtonText}>Dismiss</Text>
+                <Pressable {...buttonA11y('Dismiss result')} style={styles.secondaryButton} onPress={clearResult}>
+                  <Text maxFontSizeMultiplier={dynamicType.control} style={styles.secondaryButtonText}>Dismiss</Text>
                 </Pressable>
               </View>
             )}
diff --git a/mobile/src/app/prompt-result.tsx b/mobile/src/app/prompt-result.tsx
index 11729bc..2f65a23 100644
--- a/mobile/src/app/prompt-result.tsx
+++ b/mobile/src/app/prompt-result.tsx
@@ -1,6 +1,7 @@
 import { View, Text, ScrollView, TouchableOpacity, StyleSheet } from 'react-native';
 import { useRouter, useLocalSearchParams } from 'expo-router';
 import { usePromptStore } from '../store/prompt-store';
+import { buttonA11y, dynamicType } from '../lib/accessibility';
 import { colors } from '../theme';
 
 export default function PromptResultScreen() {
@@ -12,8 +13,8 @@ export default function PromptResultScreen() {
     return (
       <View style={styles.container}>
         <Text style={styles.empty}>No prompt result available.</Text>
-        <TouchableOpacity style={styles.btn} onPress={() => router.back()}>
-          <Text style={styles.btnText}>Go Back</Text>
+        <TouchableOpacity {...buttonA11y('Go back')} style={styles.btn} onPress={() => router.back()}>
+          <Text maxFontSizeMultiplier={dynamicType.control} style={styles.btnText}>Go Back</Text>
         </TouchableOpacity>
       </View>
     );
@@ -45,13 +46,14 @@ export default function PromptResultScreen() {
 
       <View style={styles.actions}>
         <TouchableOpacity
+          {...buttonA11y('Dismiss prompt result')}
           style={styles.btn}
           onPress={() => {
             clearResult();
             router.back();
           }}
         >
-          <Text style={styles.btnText}>Dismiss</Text>
+          <Text maxFontSizeMultiplier={dynamicType.control} style={styles.btnText}>Dismiss</Text>
         </TouchableOpacity>
       </View>
     </ScrollView>
diff --git a/mobile/src/lib/accessibility.ts b/mobile/src/lib/accessibility.ts
new file mode 100644
index 0000000..e5617ee
--- /dev/null
+++ b/mobile/src/lib/accessibility.ts
@@ -0,0 +1,39 @@
+import type { AccessibilityState } from 'react-native';
+
+export const dynamicType = {
+  control: 1.4,
+  body: 1.8,
+  heading: 1.5,
+} as const;
+
+type ButtonA11yOptions = {
+  disabled?: boolean;
+  expanded?: boolean;
+  selected?: boolean;
+};
+
+export function buttonA11y(label: string, options: ButtonA11yOptions = {}) {
+  const accessibilityState: AccessibilityState = {};
+
+  if (options.disabled !== undefined) {
+    accessibilityState.disabled = options.disabled;
+  }
+  if (options.expanded !== undefined) {
+    accessibilityState.expanded = options.expanded;
+  }
+  if (options.selected !== undefined) {
+    accessibilityState.selected = options.selected;
+  }
+
+  return {
+    accessibilityLabel: label,
+    accessibilityRole: 'button' as const,
+    ...(Object.keys(accessibilityState).length > 0 ? { accessibilityState } : {}),
+  };
+}
+
+export function textInputA11y(label: string) {
+  return {
+    accessibilityLabel: label,
+  };
+}