diff --git a/MC1/MC1App.swift b/MC1/MC1App.swift
index b5adbc687..3c70f65a1 100644
--- a/MC1/MC1App.swift
+++ b/MC1/MC1App.swift
@@ -91,6 +91,8 @@ struct MC1App: App {
         .environment(\.appTheme, appState.themeService.current)
         .tint(appState.themeService.current.chromeTint)
         .preferredColorScheme(appState.themeService.effectiveColorScheme)
+        .uiScale(appState.themeService.uiTextSizePreference.uiScale)
+        .environment(\.dynamicTypeSize, appState.themeService.uiTextSizePreference.dynamicTypeSize ?? .large)
       #if !SIDELOAD
         .task(id: ObjectIdentifier(appState)) { await appState.storeState.service.load() }
       #endif
diff --git a/MC1/Resources/Generated/L10n.swift b/MC1/Resources/Generated/L10n.swift
index 034a7fae7..eca03b76e 100644
--- a/MC1/Resources/Generated/L10n.swift
+++ b/MC1/Resources/Generated/L10n.swift
@@ -3848,6 +3848,18 @@ public enum L10n {
         /// System
         public static let system = L10n.tr("Settings", "Appearance.Scheme.System", fallback: "System")
       }
+      public enum TextSize {
+        /// Text Size
+        public static let header = L10n.tr("Settings", "Appearance.TextSize.Header", fallback: "Text Size")
+        /// Large
+        public static let large = L10n.tr("Settings", "Appearance.TextSize.Large", fallback: "Large")
+        /// Default
+        public static let system = L10n.tr("Settings", "Appearance.TextSize.System", fallback: "Default")
+        /// Extra Large
+        public static let xLarge = L10n.tr("Settings", "Appearance.TextSize.XLarge", fallback: "Extra Large")
+        /// Extra Extra Large
+        public static let xxLarge = L10n.tr("Settings", "Appearance.TextSize.XXLarge", fallback: "Extra Extra Large")
+      }
       public enum Themes {
         /// Choose a theme
         public static let header = L10n.tr("Settings", "Appearance.Themes.Header", fallback: "Choose a theme")
diff --git a/MC1/Resources/Localization/de.lproj/Settings.strings b/MC1/Resources/Localization/de.lproj/Settings.strings
index 0f3f99085..deb43d45b 100644
--- a/MC1/Resources/Localization/de.lproj/Settings.strings
+++ b/MC1/Resources/Localization/de.lproj/Settings.strings
@@ -1720,6 +1720,11 @@
 "Appearance.Scheme.System" = "System";
 "Appearance.Scheme.Light" = "Hell";
 "Appearance.Scheme.Dark" = "Dunkel";
+"Appearance.TextSize.Header" = "Textgröße";
+"Appearance.TextSize.System" = "Standard";
+"Appearance.TextSize.Large" = "Groß";
+"Appearance.TextSize.XLarge" = "Sehr groß";
+"Appearance.TextSize.XXLarge" = "Extra groß";
 "Appearance.Themes.Header" = "Design auswählen";
 "Appearance.Themes.Selected" = "Ausgewählt";
 "Appearance.MoreThemes.Link" = "Weitere Designs kaufen";
diff --git a/MC1/Resources/Localization/en.lproj/Settings.strings b/MC1/Resources/Localization/en.lproj/Settings.strings
index ab661642c..2cfa66b58 100644
--- a/MC1/Resources/Localization/en.lproj/Settings.strings
+++ b/MC1/Resources/Localization/en.lproj/Settings.strings
@@ -1717,6 +1717,11 @@
 "Appearance.Scheme.System" = "System";
 "Appearance.Scheme.Light" = "Light";
 "Appearance.Scheme.Dark" = "Dark";
+"Appearance.TextSize.Header" = "Text Size";
+"Appearance.TextSize.System" = "Default";
+"Appearance.TextSize.Large" = "Large";
+"Appearance.TextSize.XLarge" = "Extra Large";
+"Appearance.TextSize.XXLarge" = "Extra Extra Large";
 "Appearance.Themes.Header" = "Choose a theme";
 "Appearance.Themes.Selected" = "Selected";
 "Appearance.MoreThemes.Link" = "Purchase More Themes";
diff --git a/MC1/Resources/Localization/es.lproj/Settings.strings b/MC1/Resources/Localization/es.lproj/Settings.strings
index 44f79d5a6..01fb94010 100644
--- a/MC1/Resources/Localization/es.lproj/Settings.strings
+++ b/MC1/Resources/Localization/es.lproj/Settings.strings
@@ -1720,6 +1720,11 @@
 "Appearance.Scheme.System" = "Sistema";
 "Appearance.Scheme.Light" = "Claro";
 "Appearance.Scheme.Dark" = "Oscuro";
+"Appearance.TextSize.Header" = "Tamaño de texto";
+"Appearance.TextSize.System" = "Predeterminado";
+"Appearance.TextSize.Large" = "Grande";
+"Appearance.TextSize.XLarge" = "Muy grande";
+"Appearance.TextSize.XXLarge" = "Extra grande";
 "Appearance.Themes.Header" = "Elige un tema";
 "Appearance.Themes.Selected" = "Seleccionado";
 "Appearance.MoreThemes.Link" = "Comprar más temas";
diff --git a/MC1/Resources/Localization/fr.lproj/Settings.strings b/MC1/Resources/Localization/fr.lproj/Settings.strings
index 9c8d4a592..31a068b4a 100644
--- a/MC1/Resources/Localization/fr.lproj/Settings.strings
+++ b/MC1/Resources/Localization/fr.lproj/Settings.strings
@@ -1720,6 +1720,11 @@
 "Appearance.Scheme.System" = "Système";
 "Appearance.Scheme.Light" = "Clair";
 "Appearance.Scheme.Dark" = "Sombre";
+"Appearance.TextSize.Header" = "Taille du texte";
+"Appearance.TextSize.System" = "Par défaut";
+"Appearance.TextSize.Large" = "Grande";
+"Appearance.TextSize.XLarge" = "Très grande";
+"Appearance.TextSize.XXLarge" = "Extra grande";
 "Appearance.Themes.Header" = "Choisir un thème";
 "Appearance.Themes.Selected" = "Sélectionné";
 "Appearance.MoreThemes.Link" = "Acheter d'autres thèmes";
diff --git a/MC1/Resources/Localization/it.lproj/Settings.strings b/MC1/Resources/Localization/it.lproj/Settings.strings
index f6a7579bc..ba4c1fc5c 100644
--- a/MC1/Resources/Localization/it.lproj/Settings.strings
+++ b/MC1/Resources/Localization/it.lproj/Settings.strings
@@ -1718,6 +1718,11 @@
 "Appearance.Scheme.System" = "Sistema";
 "Appearance.Scheme.Light" = "Chiara";
 "Appearance.Scheme.Dark" = "Scura";
+"Appearance.TextSize.Header" = "Dimensione testo";
+"Appearance.TextSize.System" = "Predefinita";
+"Appearance.TextSize.Large" = "Grande";
+"Appearance.TextSize.XLarge" = "Molto grande";
+"Appearance.TextSize.XXLarge" = "Extra grande";
 "Appearance.Themes.Header" = "Scegli un tema";
 "Appearance.Themes.Selected" = "Selezionato";
 "Appearance.MoreThemes.Link" = "Acquista altri temi";
diff --git a/MC1/Resources/Localization/nl.lproj/Settings.strings b/MC1/Resources/Localization/nl.lproj/Settings.strings
index 6a660cf15..30a286503 100644
--- a/MC1/Resources/Localization/nl.lproj/Settings.strings
+++ b/MC1/Resources/Localization/nl.lproj/Settings.strings
@@ -1720,6 +1720,11 @@
 "Appearance.Scheme.System" = "Systeem";
 "Appearance.Scheme.Light" = "Licht";
 "Appearance.Scheme.Dark" = "Donker";
+"Appearance.TextSize.Header" = "Tekengrootte";
+"Appearance.TextSize.System" = "Standaard";
+"Appearance.TextSize.Large" = "Groot";
+"Appearance.TextSize.XLarge" = "Extra groot";
+"Appearance.TextSize.XXLarge" = "Extra extra groot";
 "Appearance.Themes.Header" = "Kies een thema";
 "Appearance.Themes.Selected" = "Geselecteerd";
 "Appearance.MoreThemes.Link" = "Meer thema's kopen";
diff --git a/MC1/Resources/Localization/pl.lproj/Settings.strings b/MC1/Resources/Localization/pl.lproj/Settings.strings
index 3c90f1a53..04b2b1083 100644
--- a/MC1/Resources/Localization/pl.lproj/Settings.strings
+++ b/MC1/Resources/Localization/pl.lproj/Settings.strings
@@ -1720,6 +1720,11 @@
 "Appearance.Scheme.System" = "Systemowy";
 "Appearance.Scheme.Light" = "Jasny";
 "Appearance.Scheme.Dark" = "Ciemny";
+"Appearance.TextSize.Header" = "Rozmiar tekstu";
+"Appearance.TextSize.System" = "Domyślny";
+"Appearance.TextSize.Large" = "Duży";
+"Appearance.TextSize.XLarge" = "Bardzo duży";
+"Appearance.TextSize.XXLarge" = "Ekstra duży";
 "Appearance.Themes.Header" = "Wybierz motyw";
 "Appearance.Themes.Selected" = "Wybrany";
 "Appearance.MoreThemes.Link" = "Kup więcej motywów";
diff --git a/MC1/Resources/Localization/ru.lproj/Settings.strings b/MC1/Resources/Localization/ru.lproj/Settings.strings
index 89501b69e..24a973745 100644
--- a/MC1/Resources/Localization/ru.lproj/Settings.strings
+++ b/MC1/Resources/Localization/ru.lproj/Settings.strings
@@ -1720,6 +1720,11 @@
 "Appearance.Scheme.System" = "Системная";
 "Appearance.Scheme.Light" = "Светлая";
 "Appearance.Scheme.Dark" = "Тёмная";
+"Appearance.TextSize.Header" = "Размер текста";
+"Appearance.TextSize.System" = "По умолчанию";
+"Appearance.TextSize.Large" = "Крупный";
+"Appearance.TextSize.XLarge" = "Очень крупный";
+"Appearance.TextSize.XXLarge" = "Экстра крупный";
 "Appearance.Themes.Header" = "Выберите тему";
 "Appearance.Themes.Selected" = "Выбрана";
 "Appearance.MoreThemes.Link" = "Купить другие темы";
diff --git a/MC1/Resources/Localization/uk.lproj/Settings.strings b/MC1/Resources/Localization/uk.lproj/Settings.strings
index 9a2165105..d0f123383 100644
--- a/MC1/Resources/Localization/uk.lproj/Settings.strings
+++ b/MC1/Resources/Localization/uk.lproj/Settings.strings
@@ -1720,6 +1720,11 @@
 "Appearance.Scheme.System" = "Системна";
 "Appearance.Scheme.Light" = "Світла";
 "Appearance.Scheme.Dark" = "Темна";
+"Appearance.TextSize.Header" = "Розмір тексту";
+"Appearance.TextSize.System" = "За замовчуванням";
+"Appearance.TextSize.Large" = "Великий";
+"Appearance.TextSize.XLarge" = "Дуже великий";
+"Appearance.TextSize.XXLarge" = "Екстра великий";
 "Appearance.Themes.Header" = "Виберіть тему";
 "Appearance.Themes.Selected" = "Вибрано";
 "Appearance.MoreThemes.Link" = "Придбати інші теми";
diff --git a/MC1/Resources/Localization/zh-Hans.lproj/Settings.strings b/MC1/Resources/Localization/zh-Hans.lproj/Settings.strings
index c4aca78e1..bd1b3cff2 100644
--- a/MC1/Resources/Localization/zh-Hans.lproj/Settings.strings
+++ b/MC1/Resources/Localization/zh-Hans.lproj/Settings.strings
@@ -1720,6 +1720,11 @@
 "Appearance.Scheme.System" = "跟随系统";
 "Appearance.Scheme.Light" = "浅色";
 "Appearance.Scheme.Dark" = "深色";
+"Appearance.TextSize.Header" = "文本大小";
+"Appearance.TextSize.System" = "默认";
+"Appearance.TextSize.Large" = "大";
+"Appearance.TextSize.XLarge" = "特大";
+"Appearance.TextSize.XXLarge" = "超大";
 "Appearance.Themes.Header" = "选择主题";
 "Appearance.Themes.Selected" = "已选择";
 "Appearance.MoreThemes.Link" = "购买更多主题";
diff --git a/MC1/Theme/AppUITextSizePreference.swift b/MC1/Theme/AppUITextSizePreference.swift
new file mode 100644
index 000000000..fed92e235
--- /dev/null
+++ b/MC1/Theme/AppUITextSizePreference.swift
@@ -0,0 +1,38 @@
+import SwiftUI
+
+/// Global app text-size preference, independent of which theme is selected.
+/// Raw values are pinned (persisted + backed up); a rename must not change the on-disk format.
+enum AppUITextSizePreference: String, CaseIterable, Identifiable {
+  case system
+  case large
+  case xLarge
+  case xxLarge
+
+  var id: String {
+    rawValue
+  }
+
+  /// `nil` means "defer to the system" — the value passed to `.dynamicTypeSize(_:)`.
+  /// `.system` maps to `nil` so the app keeps its current appearance: the root
+  /// override falls back to the `.large` preset, which `dynamicTypeSize(_:)`
+  /// treats as "no override" (no visual change for existing users).
+  var dynamicTypeSize: DynamicTypeSize? {
+    switch self {
+    case .system: nil
+    case .large: .xLarge
+    case .xLarge: .xxLarge
+    case .xxLarge: .accessibility1
+    }
+  }
+
+  /// Render-scale factor applied on Mac ("Designed for iPad"), where Dynamic Type
+  /// is disabled by the platform and no text/trait override works.
+  var uiScale: CGFloat {
+    switch self {
+    case .system: 1.0
+    case .large: 1.2
+    case .xLarge: 1.35
+    case .xxLarge: 1.5
+    }
+  }
+}
diff --git a/MC1/Theme/ThemeService.swift b/MC1/Theme/ThemeService.swift
index c7f0744fe..900805c59 100644
--- a/MC1/Theme/ThemeService.swift
+++ b/MC1/Theme/ThemeService.swift
@@ -10,6 +10,7 @@ import SwiftUI
 final class ThemeService {
   private(set) var current: Theme
   private(set) var colorSchemePreference: AppColorSchemePreference
+  private(set) var uiTextSizePreference: AppUITextSizePreference
   private let store: StoreService
   private let defaults: UserDefaults
 
@@ -42,6 +43,17 @@ final class ThemeService {
                    forKey: PersistenceKeys.appColorSchemePreference)
     }
 
+    let storedTextSize = defaults.string(forKey: PersistenceKeys.appUITextSizePreference)
+    if let raw = storedTextSize, let preference = AppUITextSizePreference(rawValue: raw) {
+      uiTextSizePreference = preference
+    } else if storedTextSize == nil {
+      uiTextSizePreference = .system // missing key: no write-back
+    } else {
+      uiTextSizePreference = .system // unknown raw value: fall back and overwrite
+      defaults.set(AppUITextSizePreference.system.rawValue,
+                   forKey: PersistenceKeys.appUITextSizePreference)
+    }
+
     // StoreService is constructed before ThemeService, so this callback is wired before
     // any Transaction.updates emission.
     store.onEntitlementsChanged = { [weak self] in
@@ -62,6 +74,11 @@ final class ThemeService {
     defaults.set(preference.rawValue, forKey: PersistenceKeys.appColorSchemePreference)
   }
 
+  func setUITextSizePreference(_ preference: AppUITextSizePreference) {
+    uiTextSizePreference = preference
+    defaults.set(preference.rawValue, forKey: PersistenceKeys.appUITextSizePreference)
+  }
+
   /// Theme-forced override wins; otherwise the user's global preference applies.
   var effectiveColorScheme: ColorScheme? {
     current.preferredColorScheme ?? colorSchemePreference.colorScheme
@@ -89,6 +106,9 @@ final class ThemeService {
 
     let resolvedScheme = resolveSchemePreferenceFromDefaults()
     if resolvedScheme != colorSchemePreference { colorSchemePreference = resolvedScheme }
+
+    let resolvedTextSize = resolveTextSizePreferenceFromDefaults()
+    if resolvedTextSize != uiTextSizePreference { uiTextSizePreference = resolvedTextSize }
   }
 
   private func resolveThemeFromDefaults() -> Theme {
@@ -123,6 +143,18 @@ final class ThemeService {
     return .system
   }
 
+  private func resolveTextSizePreferenceFromDefaults() -> AppUITextSizePreference {
+    let storedTextSize = defaults.string(forKey: PersistenceKeys.appUITextSizePreference)
+    if let raw = storedTextSize, let preference = AppUITextSizePreference(rawValue: raw) {
+      return preference
+    }
+    if storedTextSize == nil { return .system } // missing key: no write-back
+    // Unknown raw value (e.g., a future-build case via backup): fall back + corrective overwrite.
+    defaults.set(AppUITextSizePreference.system.rawValue,
+                 forKey: PersistenceKeys.appUITextSizePreference)
+    return .system
+  }
+
   /// Idempotent: invoked from `StoreService.onEntitlementsChanged`. If the current theme is no
   /// longer accessible (e.g. a refund), revert to default, persist, and announce for VoiceOver.
   ///
diff --git a/MC1/Views/Appearance/AppearanceView.swift b/MC1/Views/Appearance/AppearanceView.swift
index cf2af6ab4..0c1eee159 100644
--- a/MC1/Views/Appearance/AppearanceView.swift
+++ b/MC1/Views/Appearance/AppearanceView.swift
@@ -8,6 +8,10 @@ struct AppearanceView: View {
 
   @State private var schemeTrigger = 0
   @State private var selectionTrigger = 0
+  @State private var textSizeTrigger = 0
+
+  @ScaledMetric(relativeTo: .body) private var gridItemMinimum = ThemeCardMetrics.gridItemMinimum
+  @ScaledMetric(relativeTo: .body) private var gridSpacing = ThemeCardMetrics.gridSpacing
 
   private var themeService: ThemeService {
     appState.themeService
@@ -20,7 +24,7 @@ struct AppearanceView: View {
   private var columns: [GridItem] {
     dynamicTypeSize.isAccessibilitySize
       ? [GridItem(.flexible())]
-      : [GridItem(.adaptive(minimum: ThemeCardMetrics.gridItemMinimum), spacing: ThemeCardMetrics.gridSpacing)]
+      : [GridItem(.adaptive(minimum: gridItemMinimum), spacing: gridSpacing)]
   }
 
   /// "Purchase More Themes" is shown only when at least one registry theme is unavailable.
@@ -30,6 +34,7 @@ struct AppearanceView: View {
 
   var body: some View {
     List {
+      textSizeSection
       schemeSection
       themesSection
       if Self.shouldShowBrowseMore(available: availableThemes) {
@@ -46,6 +51,19 @@ struct AppearanceView: View {
     .navigationBarTitleDisplayMode(.inline)
     .sensoryFeedback(.selection, trigger: schemeTrigger)
     .sensoryFeedback(.selection, trigger: selectionTrigger)
+    .sensoryFeedback(.selection, trigger: textSizeTrigger)
+  }
+
+  private var textSizeSection: some View {
+    Section {
+      Picker(L10n.Settings.Appearance.TextSize.header, selection: textSizeBinding) {
+        ForEach(AppUITextSizePreference.allCases) { preference in
+          Text(textSizeLabel(preference)).tag(preference)
+        }
+      }
+      .pickerStyle(.menu)
+    }
+    .themedRowBackground(activeTheme)
   }
 
   private var schemeSection: some View {
@@ -62,7 +80,7 @@ struct AppearanceView: View {
 
   private var themesSection: some View {
     Section {
-      LazyVGrid(columns: columns, spacing: ThemeCardMetrics.gridSpacing) {
+      LazyVGrid(columns: columns, spacing: gridSpacing) {
         ForEach(availableThemes) { theme in
           ThemeSelectionCard(
             theme: theme,
@@ -88,6 +106,16 @@ struct AppearanceView: View {
     )
   }
 
+  private var textSizeBinding: Binding<AppUITextSizePreference> {
+    Binding(
+      get: { themeService.uiTextSizePreference },
+      set: {
+        themeService.setUITextSizePreference($0)
+        textSizeTrigger += 1
+      }
+    )
+  }
+
   private func schemeLabel(_ preference: AppColorSchemePreference) -> String {
     switch preference {
     case .system: L10n.Settings.Appearance.Scheme.system
@@ -96,6 +124,15 @@ struct AppearanceView: View {
     }
   }
 
+  private func textSizeLabel(_ preference: AppUITextSizePreference) -> String {
+    switch preference {
+    case .system: L10n.Settings.Appearance.TextSize.system
+    case .large: L10n.Settings.Appearance.TextSize.large
+    case .xLarge: L10n.Settings.Appearance.TextSize.xLarge
+    case .xxLarge: L10n.Settings.Appearance.TextSize.xxLarge
+    }
+  }
+
   private func select(_ theme: Theme) {
     // The list is already filtered to accessible themes; the throw path is a defensive
     // guard against a refund-driven revert landing mid-tap.
diff --git a/MC1/Views/Appearance/Components/ThemeSelectionCard.swift b/MC1/Views/Appearance/Components/ThemeSelectionCard.swift
index be471b898..6b5bdb628 100644
--- a/MC1/Views/Appearance/Components/ThemeSelectionCard.swift
+++ b/MC1/Views/Appearance/Components/ThemeSelectionCard.swift
@@ -6,6 +6,11 @@ struct ThemeSelectionCard: View {
   let isSelected: Bool
   let onSelect: () -> Void
 
+  @ScaledMetric(relativeTo: .body) private var badgeIconSpacing = ThemeCardMetrics.badgeIconSpacing
+  @ScaledMetric(relativeTo: .body) private var contentPadding = ThemeCardMetrics.contentPadding
+  @ScaledMetric(relativeTo: .body) private var cornerRadius = ThemeCardMetrics.cornerRadius
+  @ScaledMetric(relativeTo: .body) private var selectionStrokeWidth = ThemeCardMetrics.selectionStrokeWidth
+
   var body: some View {
     Button(action: onSelect) {
       VStack(spacing: 8) {
@@ -14,7 +19,7 @@ struct ThemeSelectionCard: View {
           .font(.subheadline.weight(.medium))
           .lineLimit(1)
         if isSelected {
-          HStack(spacing: ThemeCardMetrics.badgeIconSpacing) {
+          HStack(spacing: badgeIconSpacing) {
             Image(systemName: "checkmark")
             Text(L10n.Settings.Appearance.Themes.selected)
           }
@@ -24,11 +29,11 @@ struct ThemeSelectionCard: View {
           Color.clear.frame(height: 1)
         }
       }
-      .padding(ThemeCardMetrics.contentPadding)
+      .padding(contentPadding)
       .frame(maxWidth: .infinity)
       .overlay(
-        RoundedRectangle(cornerRadius: ThemeCardMetrics.cornerRadius)
-          .strokeBorder(isSelected ? Color.accentColor : .clear, lineWidth: ThemeCardMetrics.selectionStrokeWidth)
+        RoundedRectangle(cornerRadius: cornerRadius)
+          .strokeBorder(isSelected ? Color.accentColor : .clear, lineWidth: selectionStrokeWidth)
       )
     }
     .buttonStyle(.plain)
diff --git a/MC1/Views/Chats/Components/ChatInputBar.swift b/MC1/Views/Chats/Components/ChatInputBar.swift
index 99be680b6..984c75a26 100644
--- a/MC1/Views/Chats/Components/ChatInputBar.swift
+++ b/MC1/Views/Chats/Components/ChatInputBar.swift
@@ -170,6 +170,10 @@ private struct ChatInputTextField: View {
   let onFocus: () -> Void
   let glassNamespace: Namespace.ID
 
+  @ScaledMetric(relativeTo: .body) private var controlHeight = ChatInputMetrics.controlHeight
+  @ScaledMetric(relativeTo: .body) private var fieldCornerRadius = ChatInputMetrics.fieldCornerRadius
+  @ScaledMetric(relativeTo: .body) private var fieldBorderWidth = ChatInputMetrics.fieldBorderWidth
+
   var body: some View {
     ChatComposerTextView(
       text: $text,
@@ -179,7 +183,7 @@ private struct ChatInputTextField: View {
       onSend: onSend,
       onFocus: onFocus
     )
-    .frame(maxWidth: .infinity, minHeight: ChatInputMetrics.controlHeight)
+    .frame(maxWidth: .infinity, minHeight: controlHeight)
     .overlay(alignment: .topLeading) {
       if text.isEmpty {
         Text(placeholder)
@@ -199,7 +203,7 @@ private struct ChatInputTextField: View {
         .padding(.trailing, 10)
         .accessibilityHidden(true)
     }
-    .textFieldBackground()
+    .textFieldBackground(cornerRadius: fieldCornerRadius, borderWidth: fieldBorderWidth)
     .liquidGlassID("chatComposer", in: glassNamespace)
   }
 }
@@ -264,12 +268,14 @@ private struct ChatSendButton: View {
   let sendAccessibilityHint: String
   let onSend: () -> Void
 
+  @ScaledMetric(relativeTo: .body) private var controlHeight = ChatInputMetrics.controlHeight
+
   var body: some View {
     Button(action: onSend) {
       Image(systemName: "arrow.up")
-        .font(.system(size: 18, weight: .semibold))
+        .font(.body.bold())
         .foregroundStyle(.white)
-        .frame(width: ChatInputMetrics.controlHeight, height: ChatInputMetrics.controlHeight)
+        .frame(width: controlHeight, height: controlHeight)
         .sendButtonBackground()
         .contentShape(Circle())
     }
@@ -292,15 +298,15 @@ private extension View {
   }
 
   @ViewBuilder
-  func textFieldBackground() -> some View {
+  func textFieldBackground(cornerRadius: CGFloat, borderWidth: CGFloat) -> some View {
     if #available(iOS 26.0, *) {
-      glassEffect(.regular.interactive(), in: .rect(cornerRadius: ChatInputMetrics.fieldCornerRadius))
+      glassEffect(.regular.interactive(), in: .rect(cornerRadius: cornerRadius))
     } else {
       // Without the glass capsule the field would read as one fill on the bar's fill, so its edge
       // carries the affordance. A clear centre keeps it legible against any theme canvas.
       overlay {
-        RoundedRectangle(cornerRadius: ChatInputMetrics.fieldCornerRadius)
-          .strokeBorder(Color(.separator), lineWidth: ChatInputMetrics.fieldBorderWidth)
+        RoundedRectangle(cornerRadius: cornerRadius)
+          .strokeBorder(Color(.separator), lineWidth: borderWidth)
       }
     }
   }
diff --git a/MC1/Views/Chats/Components/ChatShareMenu.swift b/MC1/Views/Chats/Components/ChatShareMenu.swift
index 8c56ff474..d41fba15b 100644
--- a/MC1/Views/Chats/Components/ChatShareMenu.swift
+++ b/MC1/Views/Chats/Components/ChatShareMenu.swift
@@ -13,6 +13,8 @@ struct ChatShareMenu: View {
 
   @Environment(\.appState) private var appState
 
+  @ScaledMetric(relativeTo: .body) private var controlHeight = ChatInputMetrics.controlHeight
+
   @State private var isShowingContactPicker = false
   @State private var locationTask: Task<Void, Never>?
 
@@ -98,9 +100,9 @@ struct ChatShareMenu: View {
       .disabled(!canShareMyInfo)
     } label: {
       Image(systemName: "plus")
-        .font(.system(size: 18, weight: .semibold))
+        .font(.body.weight(.semibold))
         .foregroundStyle(plusIconColor)
-        .frame(width: ChatInputMetrics.controlHeight, height: ChatInputMetrics.controlHeight)
+        .frame(width: controlHeight, height: controlHeight)
         .plusButtonBackground()
     }
     .buttonStyle(.plain)
diff --git a/MC1/Views/Components/UIScaleContainer.swift b/MC1/Views/Components/UIScaleContainer.swift
new file mode 100644
index 000000000..16b75733e
--- /dev/null
+++ b/MC1/Views/Components/UIScaleContainer.swift
@@ -0,0 +1,58 @@
+import SwiftUI
+import UIKit
+
+/// Render-time zoom for the whole app UI.
+///
+/// On "Designed for iPad" (iOS apps running on Apple Silicon Macs) Apple disables
+/// Dynamic Type entirely: neither the SwiftUI `\.dynamicTypeSize` nor the low-level
+/// `\.sizeCategory` environment values scale `Text`/`List` fonts on that runtime.
+/// The only way to make the whole UI bigger there is to scale the rendered output.
+///
+/// The naive `scaleEffect` clips content because the view still lays out at 1.0×
+/// while rendering at `scale` — scroll views measure layout space, not render
+/// space. The fix is the classic "scale with compensating frame" trick: lay the
+/// content out in a frame of `windowSize / scale`, then scale it up by `scale` so
+/// the rendered output exactly fills the window. Layout sees the pre-scale size,
+/// so scroll metrics and hit targets stay consistent with what is on screen.
+///
+/// Only active when actually running on a Mac (`isiOSAppOnMac`) with a scale > 1;
+/// on iOS the standard Dynamic Type path (`.environment(\.dynamicTypeSize, ...)`)
+/// already scales text and `@ScaledMetric` values proportionally, so the view is
+/// passed through untouched with no `GeometryReader` layout overhead.
+struct UIScaleContainer<Content: View>: View {
+  let scale: CGFloat
+  @ViewBuilder let content: Content
+
+  private var shouldZoom: Bool {
+    ProcessInfo.processInfo.isiOSAppOnMac && scale > 1.001
+  }
+
+  var body: some View {
+    if shouldZoom {
+      GeometryReader { proxy in
+        content
+          .frame(
+            width: proxy.size.width / scale,
+            height: proxy.size.height / scale,
+            alignment: .topLeading
+          )
+          .scaleEffect(scale, anchor: .topLeading)
+          .frame(
+            width: proxy.size.width,
+            height: proxy.size.height,
+            alignment: .topLeading
+          )
+          .clipped()
+      }
+    } else {
+      content
+    }
+  }
+}
+
+extension View {
+  /// Scales the whole view by `scale` on Mac ("Designed for iPad"); no-op on iOS.
+  func uiScale(_ scale: CGFloat) -> some View {
+    UIScaleContainer(scale: scale) { self }
+  }
+}
diff --git a/MC1/Views/Onboarding/DeviceScanView.swift b/MC1/Views/Onboarding/DeviceScanView.swift
index 023c6bf65..ff79a0803 100644
--- a/MC1/Views/Onboarding/DeviceScanView.swift
+++ b/MC1/Views/Onboarding/DeviceScanView.swift
@@ -14,13 +14,17 @@ struct DeviceScanView: View {
   @State private var otherAppDeviceID: UUID?
   private var demoModeManager = DemoModeManager.shared
 
+  @ScaledMetric(relativeTo: .body) private var largeSpacing = OnboardingMetrics.largeSpacing
+  @ScaledMetric(relativeTo: .body) private var mediumSpacing = OnboardingMetrics.mediumSpacing
+  @ScaledMetric(relativeTo: .body) private var minHitTarget = OnboardingMetrics.minHitTarget
+
   private var hasConnectedDevice: Bool {
     appState.connectionState == .ready
   }
 
   var body: some View {
-    VStack(spacing: OnboardingMetrics.largeSpacing) {
-      VStack(spacing: OnboardingMetrics.mediumSpacing) {
+    VStack(spacing: largeSpacing) {
+      VStack(spacing: mediumSpacing) {
         PulsingAntenna()
 
         Text(L10n.Onboarding.DeviceScan.title)
@@ -43,7 +47,7 @@ struct DeviceScanView: View {
       Spacer()
 
       if hasConnectedDevice, !didInitiatePairing {
-        VStack(spacing: OnboardingMetrics.mediumSpacing) {
+        VStack(spacing: mediumSpacing) {
           Text(L10n.Onboarding.DeviceScan.alreadyPaired)
             .font(.title2)
             .multilineTextAlignment(.center)
@@ -53,7 +57,7 @@ struct DeviceScanView: View {
 
       Spacer()
 
-      VStack(spacing: OnboardingMetrics.mediumSpacing) {
+      VStack(spacing: mediumSpacing) {
         if hasConnectedDevice {
           Button {
             appState.onboarding.onboardingPath.append(.region)
@@ -68,14 +72,14 @@ struct DeviceScanView: View {
           primaryCTA
 
           ViewThatFits {
-            HStack(spacing: OnboardingMetrics.largeSpacing) {
+            HStack(spacing: largeSpacing) {
               secondaryButtons
             }
-            VStack(spacing: OnboardingMetrics.mediumSpacing) {
+            VStack(spacing: mediumSpacing) {
               secondaryButtons
             }
           }
-          .frame(minHeight: OnboardingMetrics.minHitTarget)
+          .frame(minHeight: minHitTarget)
 
           Button(L10n.Onboarding.DeviceScan.noDeviceYet) {
             showingNoDeviceSheet = true
@@ -83,7 +87,7 @@ struct DeviceScanView: View {
           .font(.subheadline)
           .foregroundStyle(.secondary)
           .padding(.vertical, 8)
-          .frame(minHeight: OnboardingMetrics.minHitTarget)
+          .frame(minHeight: minHitTarget)
         }
       }
       .padding(.horizontal)
diff --git a/MC1/Views/Onboarding/NoDeviceSheet.swift b/MC1/Views/Onboarding/NoDeviceSheet.swift
index 497a00a4a..9f3fd3b1b 100644
--- a/MC1/Views/Onboarding/NoDeviceSheet.swift
+++ b/MC1/Views/Onboarding/NoDeviceSheet.swift
@@ -9,13 +9,18 @@ struct NoDeviceSheet: View {
   @Environment(\.dynamicTypeSize) private var dynamicTypeSize
   @State private var dismissTrigger = false
 
+  @ScaledMetric(relativeTo: .body) private var largeSpacing = OnboardingMetrics.largeSpacing
+  @ScaledMetric(relativeTo: .body) private var mediumSpacing = OnboardingMetrics.mediumSpacing
+  @ScaledMetric(relativeTo: .body) private var sheetTopPadding = OnboardingMetrics.sheetTopPadding
+  @ScaledMetric(relativeTo: .body) private var minHitTarget = OnboardingMetrics.minHitTarget
+
   var body: some View {
-    VStack(spacing: OnboardingMetrics.largeSpacing) {
+    VStack(spacing: largeSpacing) {
       Text(L10n.Onboarding.NoDevice.Sheet.title)
         .font(.title2)
         .bold()
         .accessibilityHeading(.h1)
-        .padding(.top, OnboardingMetrics.sheetTopPadding)
+        .padding(.top, sheetTopPadding)
 
       Text(L10n.Onboarding.NoDevice.Sheet.body)
         .font(.body)
@@ -25,7 +30,7 @@ struct NoDeviceSheet: View {
 
       Spacer()
 
-      VStack(spacing: OnboardingMetrics.mediumSpacing) {
+      VStack(spacing: mediumSpacing) {
         Button {
           dismissTrigger.toggle()
           appState.completeOnboarding()
@@ -37,17 +42,17 @@ struct NoDeviceSheet: View {
             .padding()
         }
         .liquidGlassProminentButtonStyle()
-        .frame(minHeight: OnboardingMetrics.minHitTarget)
+        .frame(minHeight: minHitTarget)
 
         Button(L10n.Onboarding.NoDevice.Sheet.cancel) {
           dismiss()
         }
         .buttonStyle(.bordered)
         .tint(.secondary)
-        .frame(minHeight: OnboardingMetrics.minHitTarget)
+        .frame(minHeight: minHitTarget)
       }
       .padding(.horizontal)
-      .padding(.bottom, OnboardingMetrics.largeSpacing)
+      .padding(.bottom, largeSpacing)
     }
     .sensoryFeedback(.selection, trigger: dismissTrigger)
     .presentationDetents(dynamicTypeSize.isAccessibilitySize ? [.large] : [.medium])
diff --git a/MC1/Views/Onboarding/PermissionsView.swift b/MC1/Views/Onboarding/PermissionsView.swift
index 44b8699e9..29ffc5853 100644
--- a/MC1/Views/Onboarding/PermissionsView.swift
+++ b/MC1/Views/Onboarding/PermissionsView.swift
@@ -7,11 +7,18 @@ struct PermissionsView: View {
   @State private var coordinator = PermissionsCoordinator()
   @State private var permissionGrantTrigger = false
 
+  @ScaledMetric(relativeTo: .body) private var sheetTopPadding = OnboardingMetrics.sheetTopPadding
+  @ScaledMetric(relativeTo: .body) private var mediumSpacing = OnboardingMetrics.mediumSpacing
+  @ScaledMetric(relativeTo: .body) private var iconSize = OnboardingMetrics.iconSize
+  @ScaledMetric(relativeTo: .body) private var headerTopPadding = OnboardingMetrics.headerTopPadding
+  @ScaledMetric(relativeTo: .body) private var contentPadding = OnboardingMetrics.contentPadding
+  @ScaledMetric(relativeTo: .body) private var cardSpacing = OnboardingMetrics.cardSpacing
+
   var body: some View {
-    VStack(spacing: OnboardingMetrics.sheetTopPadding) {
-      VStack(spacing: OnboardingMetrics.mediumSpacing) {
+    VStack(spacing: sheetTopPadding) {
+      VStack(spacing: mediumSpacing) {
         Image(systemName: "checkmark.shield.fill")
-          .font(.system(size: OnboardingMetrics.iconSize))
+          .font(.system(size: iconSize))
           .foregroundStyle(.tint)
 
         Text(L10n.Onboarding.Permissions.title)
@@ -25,15 +32,15 @@ struct PermissionsView: View {
           .multilineTextAlignment(.center)
           .padding(.horizontal)
       }
-      .padding(.top, OnboardingMetrics.headerTopPadding)
+      .padding(.top, headerTopPadding)
 
       GeometryReader { proxy in
         ScrollView {
           VStack(spacing: 0) {
             Spacer(minLength: 0)
 
-            LiquidGlassContainer(spacing: OnboardingMetrics.contentPadding) {
-              VStack(spacing: OnboardingMetrics.cardSpacing) {
+            LiquidGlassContainer(spacing: contentPadding) {
+              VStack(spacing: cardSpacing) {
                 PermissionCard(
                   icon: "bell.fill",
                   title: L10n.Onboarding.Permissions.Notifications.title,
diff --git a/MC1/Views/Onboarding/PresetStepView.swift b/MC1/Views/Onboarding/PresetStepView.swift
index c80638427..fdbc75d49 100644
--- a/MC1/Views/Onboarding/PresetStepView.swift
+++ b/MC1/Views/Onboarding/PresetStepView.swift
@@ -13,6 +13,14 @@ struct PresetStepView: View {
   @State private var commitTrigger = false
   @State private var forceShowPicker = false
 
+  @ScaledMetric(relativeTo: .body) private var cardSpacing = OnboardingMetrics.cardSpacing
+  @ScaledMetric(relativeTo: .body) private var iconSize = OnboardingMetrics.iconSize
+  @ScaledMetric(relativeTo: .body) private var mediumSpacing = OnboardingMetrics.mediumSpacing
+  @ScaledMetric(relativeTo: .body) private var minHitTarget = OnboardingMetrics.minHitTarget
+  @ScaledMetric(relativeTo: .body) private var titleStackSpacing = OnboardingMetrics.titleStackSpacing
+  @ScaledMetric(relativeTo: .body) private var headerTopPadding = OnboardingMetrics.headerTopPadding
+  @ScaledMetric(relativeTo: .body) private var compactSpacing = OnboardingMetrics.compactSpacing
+
   private var region: RegionSelection? {
     appState.regionSelection
   }
@@ -76,10 +84,10 @@ struct PresetStepView: View {
   }
 
   private func alreadyConfiguredState(preset: RadioPreset) -> some View {
-    VStack(spacing: OnboardingMetrics.cardSpacing) {
+    VStack(spacing: cardSpacing) {
       Spacer()
       Image(systemName: "checkmark.circle.fill")
-        .font(.system(size: OnboardingMetrics.iconSize))
+        .font(.system(size: iconSize))
         .foregroundStyle(.tint)
       Text(L10n.Onboarding.Preset.AlreadyConfigured.title)
         .font(.largeTitle)
@@ -96,7 +104,7 @@ struct PresetStepView: View {
 
       Spacer()
 
-      VStack(spacing: OnboardingMetrics.mediumSpacing) {
+      VStack(spacing: mediumSpacing) {
         Button {
           commitTrigger.toggle()
           appState.completeOnboarding()
@@ -113,7 +121,7 @@ struct PresetStepView: View {
         }
         .buttonStyle(.bordered)
         .tint(.accentColor)
-        .frame(minHeight: OnboardingMetrics.minHitTarget)
+        .frame(minHeight: minHitTarget)
       }
       .padding(.horizontal)
       .padding(.bottom)
@@ -121,8 +129,8 @@ struct PresetStepView: View {
   }
 
   private var pickerState: some View {
-    VStack(spacing: OnboardingMetrics.cardSpacing) {
-      VStack(spacing: OnboardingMetrics.titleStackSpacing) {
+    VStack(spacing: cardSpacing) {
+      VStack(spacing: titleStackSpacing) {
         Text(L10n.Onboarding.Preset.title)
           .font(.largeTitle)
           .bold()
@@ -137,10 +145,10 @@ struct PresetStepView: View {
             .foregroundStyle(.secondary)
         }
       }
-      .padding(.top, OnboardingMetrics.headerTopPadding)
+      .padding(.top, headerTopPadding)
 
       ScrollView {
-        VStack(spacing: OnboardingMetrics.mediumSpacing) {
+        VStack(spacing: mediumSpacing) {
           ForEach(visiblePresets) { preset in
             rowCard(preset)
           }
@@ -152,7 +160,7 @@ struct PresetStepView: View {
             .font(.footnote)
             .foregroundStyle(.secondary)
             .multilineTextAlignment(.center)
-            .padding(.top, OnboardingMetrics.mediumSpacing)
+            .padding(.top, mediumSpacing)
           }
         }
         .padding(.horizontal)
@@ -189,7 +197,7 @@ struct PresetStepView: View {
       selectedID = preset.id
     } label: {
       HStack {
-        VStack(alignment: .leading, spacing: OnboardingMetrics.compactSpacing) {
+        VStack(alignment: .leading, spacing: compactSpacing) {
           Text(preset.name)
             .font(.body)
           Text("\(preset.frequencyMHz, format: .number.precision(.fractionLength(3)).locale(.posix)) MHz")
@@ -203,7 +211,7 @@ struct PresetStepView: View {
         }
       }
       .padding()
-      .frame(maxWidth: .infinity, minHeight: OnboardingMetrics.minHitTarget)
+      .frame(maxWidth: .infinity, minHeight: minHitTarget)
       .contentShape(.rect)
     }
     .buttonStyle(.plain)
diff --git a/MC1/Views/Onboarding/PulsingAntenna.swift b/MC1/Views/Onboarding/PulsingAntenna.swift
index 2cfba6235..1445dfece 100644
--- a/MC1/Views/Onboarding/PulsingAntenna.swift
+++ b/MC1/Views/Onboarding/PulsingAntenna.swift
@@ -5,11 +5,13 @@ import SwiftUI
 struct PulsingAntenna: View {
   @Environment(\.accessibilityReduceMotion) private var reduceMotion
 
+  @ScaledMetric(relativeTo: .body) private var heroSize = OnboardingMetrics.heroSize
+
   var body: some View {
     Image(systemName: "antenna.radiowaves.left.and.right")
-      .font(.system(size: OnboardingMetrics.heroSize / 2))
+      .font(.system(size: heroSize / 2))
       .foregroundStyle(.tint)
-      .frame(height: OnboardingMetrics.heroSize)
+      .frame(height: heroSize)
       .symbolEffect(.pulse, isActive: !reduceMotion)
       .accessibilityHidden(true)
   }
diff --git a/MC1/Views/Onboarding/RegionStepView.swift b/MC1/Views/Onboarding/RegionStepView.swift
index 6a500ed8f..4ce75c1d1 100644
--- a/MC1/Views/Onboarding/RegionStepView.swift
+++ b/MC1/Views/Onboarding/RegionStepView.swift
@@ -15,6 +15,13 @@ struct RegionStepView: View {
   @State private var pendingUserRetry = false
   @State private var errorMessage: String?
 
+  @ScaledMetric(relativeTo: .body) private var cardSpacing = OnboardingMetrics.cardSpacing
+  @ScaledMetric(relativeTo: .body) private var titleStackSpacing = OnboardingMetrics.titleStackSpacing
+  @ScaledMetric(relativeTo: .body) private var headerTopPadding = OnboardingMetrics.headerTopPadding
+  @ScaledMetric(relativeTo: .body) private var contentPadding = OnboardingMetrics.contentPadding
+  @ScaledMetric(relativeTo: .body) private var cardCornerRadius = OnboardingMetrics.cardCornerRadius
+  @ScaledMetric(relativeTo: .body) private var minHitTarget = OnboardingMetrics.minHitTarget
+
   private var locationGranted: Bool {
     appState.locationService.isAuthorized
   }
@@ -59,7 +66,7 @@ struct RegionStepView: View {
   }
 
   private var resolvingState: some View {
-    VStack(spacing: OnboardingMetrics.cardSpacing) {
+    VStack(spacing: cardSpacing) {
       Spacer()
       ProgressView().controlSize(.large)
       Text(L10n.Onboarding.Region.resolving)
@@ -70,8 +77,8 @@ struct RegionStepView: View {
   }
 
   private func detectedState(region: RegionSelection) -> some View {
-    VStack(spacing: OnboardingMetrics.cardSpacing) {
-      VStack(spacing: OnboardingMetrics.titleStackSpacing) {
+    VStack(spacing: cardSpacing) {
+      VStack(spacing: titleStackSpacing) {
         Text(L10n.Onboarding.Region.title)
           .font(.largeTitle)
           .bold()
@@ -81,11 +88,11 @@ struct RegionStepView: View {
           .foregroundStyle(.secondary)
           .multilineTextAlignment(.center)
       }
-      .padding(.top, OnboardingMetrics.headerTopPadding)
+      .padding(.top, headerTopPadding)
 
       Spacer()
 
-      VStack(spacing: OnboardingMetrics.titleStackSpacing) {
+      VStack(spacing: titleStackSpacing) {
         Text(L10n.Onboarding.Region.Detected.tag)
           .font(.caption.weight(.medium))
           .foregroundStyle(.tint)
@@ -97,9 +104,9 @@ struct RegionStepView: View {
           .font(.caption)
           .foregroundStyle(.secondary)
       }
-      .padding(OnboardingMetrics.contentPadding)
+      .padding(contentPadding)
       .frame(maxWidth: .infinity)
-      .liquidGlass(in: .rect(cornerRadius: OnboardingMetrics.cardCornerRadius))
+      .liquidGlass(in: .rect(cornerRadius: cardCornerRadius))
       .padding(.horizontal)
       .accessibilityElement(children: .combine)
 
@@ -109,7 +116,7 @@ struct RegionStepView: View {
       .font(.subheadline)
       .buttonStyle(.bordered)
       .tint(.accentColor)
-      .frame(minHeight: OnboardingMetrics.minHitTarget)
+      .frame(minHeight: minHitTarget)
 
       Spacer()
 
@@ -130,8 +137,8 @@ struct RegionStepView: View {
   }
 
   private var manualPickerState: some View {
-    VStack(spacing: OnboardingMetrics.cardSpacing) {
-      VStack(spacing: OnboardingMetrics.titleStackSpacing) {
+    VStack(spacing: cardSpacing) {
+      VStack(spacing: titleStackSpacing) {
         Text(L10n.Onboarding.Region.title)
           .font(.largeTitle)
           .bold()
@@ -141,7 +148,7 @@ struct RegionStepView: View {
           .foregroundStyle(.secondary)
           .multilineTextAlignment(.center)
       }
-      .padding(.top, OnboardingMetrics.headerTopPadding)
+      .padding(.top, headerTopPadding)
 
       RegionPickerView(selection: $manualSelection)
 
@@ -157,7 +164,7 @@ struct RegionStepView: View {
         }
         .font(.subheadline)
         .foregroundStyle(.tint)
-        .frame(minHeight: OnboardingMetrics.minHitTarget)
+        .frame(minHeight: minHitTarget)
       }
 
       Button {
diff --git a/MC1/Views/Onboarding/TroubleshootingSheet.swift b/MC1/Views/Onboarding/TroubleshootingSheet.swift
index 02efd0305..093c760b8 100644
--- a/MC1/Views/Onboarding/TroubleshootingSheet.swift
+++ b/MC1/Views/Onboarding/TroubleshootingSheet.swift
@@ -11,6 +11,8 @@ struct TroubleshootingSheet: View {
   @Environment(\.openURL) private var openURL
   @State private var isClearing = false
 
+  @ScaledMetric(relativeTo: .body) private var titleStackSpacing = OnboardingMetrics.titleStackSpacing
+
   var body: some View {
     NavigationStack {
       List {
@@ -24,7 +26,7 @@ struct TroubleshootingSheet: View {
         }
 
         Section {
-          VStack(alignment: .leading, spacing: OnboardingMetrics.titleStackSpacing) {
+          VStack(alignment: .leading, spacing: titleStackSpacing) {
             Text(L10n.Onboarding.Troubleshooting.FactoryReset.explanation)
               .font(.subheadline)
               .foregroundStyle(.secondary)
@@ -59,7 +61,7 @@ struct TroubleshootingSheet: View {
         }
 
         Section {
-          VStack(alignment: .leading, spacing: OnboardingMetrics.titleStackSpacing) {
+          VStack(alignment: .leading, spacing: titleStackSpacing) {
             Text(L10n.Onboarding.Troubleshooting.SystemSettings.manageAccessories)
               .font(.subheadline)
             Text(L10n.Onboarding.Troubleshooting.SystemSettings.path)
diff --git a/MC1/Views/Onboarding/WelcomeView.swift b/MC1/Views/Onboarding/WelcomeView.swift
index a3217e172..1cccd8273 100644
--- a/MC1/Views/Onboarding/WelcomeView.swift
+++ b/MC1/Views/Onboarding/WelcomeView.swift
@@ -3,12 +3,15 @@ import SwiftUI
 struct WelcomeView: View {
   @Environment(\.appState) private var appState
 
+  @ScaledMetric(relativeTo: .body) private var heroSize = OnboardingMetrics.heroSize
+  @ScaledMetric(relativeTo: .body) private var cardSpacing = OnboardingMetrics.cardSpacing
+
   var body: some View {
-    VStack(spacing: OnboardingMetrics.cardSpacing * 2) {
+    VStack(spacing: cardSpacing * 2) {
       Spacer()
 
       MeshAnimationView()
-        .frame(height: OnboardingMetrics.heroSize)
+        .frame(height: heroSize)
         .padding(.horizontal)
 
       VStack(spacing: 12) {
diff --git a/MC1/Views/PathEditing/AddHopPickerView.swift b/MC1/Views/PathEditing/AddHopPickerView.swift
index 5d7eff945..a6060347d 100644
--- a/MC1/Views/PathEditing/AddHopPickerView.swift
+++ b/MC1/Views/PathEditing/AddHopPickerView.swift
@@ -357,13 +357,17 @@ private struct PickerRowView: View {
   @State private var showSuccess = false
   @State private var resetTask: Task<Void, Never>?
 
+  @ScaledMetric(relativeTo: .body) private var rowContentSpacing = PathEditMetrics.rowContentSpacing
+  @ScaledMetric(relativeTo: .body) private var badgeSpacing = PathEditMetrics.badgeSpacing
+  @ScaledMetric(relativeTo: .body) private var tapTarget = PathEditMetrics.tapTarget
+
   private static let successDuration: Duration = .seconds(1.5)
 
   var body: some View {
     Button(action: handleTap) {
-      HStack(spacing: PathEditMetrics.rowContentSpacing) {
+      HStack(spacing: rowContentSpacing) {
         VStack(alignment: .leading, spacing: 2) {
-          HStack(spacing: PathEditMetrics.badgeSpacing) {
+          HStack(spacing: badgeSpacing) {
             Text(node.displayName)
               .font(.body)
             if node.isFavorite {
@@ -394,7 +398,7 @@ private struct PickerRowView: View {
         Spacer()
         trailingIcon
       }
-      .frame(minHeight: PathEditMetrics.tapTarget)
+      .frame(minHeight: tapTarget)
       .contentShape(Rectangle())
     }
     .buttonStyle(.plain)
@@ -441,14 +445,17 @@ private struct PickerRowView: View {
 private struct BulkCodeRow: View {
   let classification: HopCodeClassification
 
+  @ScaledMetric(relativeTo: .body) private var rowContentSpacing = PathEditMetrics.rowContentSpacing
+  @ScaledMetric(relativeTo: .body) private var tapTarget = PathEditMetrics.tapTarget
+
   var body: some View {
-    HStack(spacing: PathEditMetrics.rowContentSpacing) {
+    HStack(spacing: rowContentSpacing) {
       Text(rowText)
         .font(.callout)
       Spacer()
       trailingIcon
     }
-    .frame(minHeight: PathEditMetrics.tapTarget)
+    .frame(minHeight: tapTarget)
     .accessibilityElement(children: .combine)
   }
 
diff --git a/MC1/Views/PathEditing/PathEditCTALabel.swift b/MC1/Views/PathEditing/PathEditCTALabel.swift
index 921f11a17..f0291af29 100644
--- a/MC1/Views/PathEditing/PathEditCTALabel.swift
+++ b/MC1/Views/PathEditing/PathEditCTALabel.swift
@@ -9,12 +9,15 @@ struct PathEditCTALabel: View {
   let title: String
   let systemImage: String
 
+  @ScaledMetric(relativeTo: .body) private var ctaIconSpacing = PathEditMetrics.ctaIconSpacing
+  @ScaledMetric(relativeTo: .body) private var ctaIconSize = PathEditMetrics.ctaIconSize
+
   var body: some View {
-    HStack(spacing: PathEditMetrics.ctaIconSpacing) {
+    HStack(spacing: ctaIconSpacing) {
       Spacer()
       Image(systemName: systemImage)
         .font(.body.weight(.semibold))
-        .frame(width: PathEditMetrics.ctaIconSize, height: PathEditMetrics.ctaIconSize)
+        .frame(width: ctaIconSize, height: ctaIconSize)
       Text(title)
         .font(.body.weight(.semibold))
       Spacer()
diff --git a/MC1/Views/PathEditing/PathEditingSheet.swift b/MC1/Views/PathEditing/PathEditingSheet.swift
index af79cef7d..de0f38295 100644
--- a/MC1/Views/PathEditing/PathEditingSheet.swift
+++ b/MC1/Views/PathEditing/PathEditingSheet.swift
@@ -243,6 +243,8 @@ private struct PathHopRow: View {
   let index: Int
   let totalCount: Int
 
+  @ScaledMetric(relativeTo: .body) private var tapTarget = PathEditMetrics.tapTarget
+
   var body: some View {
     VStack(alignment: .leading, spacing: 2) {
       if let name = hop.resolvedName {
@@ -254,7 +256,7 @@ private struct PathHopRow: View {
         Text(hop.hashHex).font(.body.monospaced())
       }
     }
-    .frame(minHeight: PathEditMetrics.tapTarget)
+    .frame(minHeight: tapTarget)
     .accessibilityElement(children: .combine)
     .accessibilityLabel(accessibilityDescription)
     .accessibilityHint(L10n.Contacts.Contacts.PathEdit.hopHint)
diff --git a/MC1/Views/Support/Components/ThemeBundleCard.swift b/MC1/Views/Support/Components/ThemeBundleCard.swift
index b429b6b6f..3bc5c4a39 100644
--- a/MC1/Views/Support/Components/ThemeBundleCard.swift
+++ b/MC1/Views/Support/Components/ThemeBundleCard.swift
@@ -11,6 +11,8 @@ struct ThemeBundleCard: View {
   @Environment(\.appTheme) private var theme
   @State private var isPurchasing = false
 
+  @ScaledMetric(relativeTo: .body) private var cornerRadius = ThemeCardMetrics.cornerRadius
+
   var body: some View {
     VStack(alignment: .center, spacing: 10) {
       Text(L10n.Settings.Support.Bundle.title)
@@ -23,7 +25,7 @@ struct ThemeBundleCard: View {
     }
     .padding(12)
     .frame(maxWidth: .infinity, alignment: .center)
-    .background(theme.surfaces?.card ?? Color(.secondarySystemGroupedBackground), in: RoundedRectangle(cornerRadius: ThemeCardMetrics.cornerRadius))
+    .background(theme.surfaces?.card ?? Color(.secondarySystemGroupedBackground), in: RoundedRectangle(cornerRadius: cornerRadius))
     .accessibilityElement(children: .ignore)
     .accessibilityLabel(accessibilityLabel)
     .accessibilityHint(isActionable ? L10n.Settings.Support.Accessibility.BundleCard.lockedHint : "")
diff --git a/MC1/Views/Support/Components/ThemePreviewCard.swift b/MC1/Views/Support/Components/ThemePreviewCard.swift
index cf3e1d50b..fbd5246fb 100644
--- a/MC1/Views/Support/Components/ThemePreviewCard.swift
+++ b/MC1/Views/Support/Components/ThemePreviewCard.swift
@@ -7,6 +7,9 @@ struct ThemePreviewCard: View {
   let theme: Theme
   let isOwned: Bool
 
+  @ScaledMetric(relativeTo: .body) private var badgeIconSpacing = ThemeCardMetrics.badgeIconSpacing
+  @ScaledMetric(relativeTo: .body) private var contentPadding = ThemeCardMetrics.contentPadding
+
   var body: some View {
     VStack(spacing: 8) {
       ZStack(alignment: .topTrailing) {
@@ -23,7 +26,7 @@ struct ThemePreviewCard: View {
         .font(.subheadline.weight(.medium))
         .lineLimit(1)
       if isOwned {
-        HStack(spacing: ThemeCardMetrics.badgeIconSpacing) {
+        HStack(spacing: badgeIconSpacing) {
           Image(systemName: "checkmark")
           Text(L10n.Settings.Support.Themes.owned)
         }
@@ -31,7 +34,7 @@ struct ThemePreviewCard: View {
         .foregroundStyle(.secondary)
       }
     }
-    .padding(ThemeCardMetrics.contentPadding)
+    .padding(contentPadding)
     .frame(maxWidth: .infinity)
     .accessibilityElement(children: .ignore)
     .accessibilityLabel(accessibilityLabel)
diff --git a/MC1/Views/Support/Sections/ThemesPurchaseSection.swift b/MC1/Views/Support/Sections/ThemesPurchaseSection.swift
index c8d1db3d1..f904427a9 100644
--- a/MC1/Views/Support/Sections/ThemesPurchaseSection.swift
+++ b/MC1/Views/Support/Sections/ThemesPurchaseSection.swift
@@ -9,6 +9,12 @@ struct ThemesPurchaseSection: View {
   @Environment(\.dynamicTypeSize) private var dynamicTypeSize
   @Environment(\.purchase) private var purchase
 
+  @ScaledMetric(relativeTo: .body) private var gridItemMinimum = ThemeCardMetrics.gridItemMinimum
+  @ScaledMetric(relativeTo: .body) private var gridSpacing = ThemeCardMetrics.gridSpacing
+  @ScaledMetric(relativeTo: .body) private var allUnlockedEmojiSize = ThemeCardMetrics.allUnlockedEmojiSize
+  @ScaledMetric(relativeTo: .body) private var allUnlockedSpacing = ThemeCardMetrics.allUnlockedSpacing
+  @ScaledMetric(relativeTo: .body) private var allUnlockedVerticalPadding = ThemeCardMetrics.allUnlockedVerticalPadding
+
   private var storeState: StoreState {
     appState.storeState
   }
@@ -24,7 +30,7 @@ struct ThemesPurchaseSection: View {
   private var columns: [GridItem] {
     dynamicTypeSize.isAccessibilitySize
       ? [GridItem(.flexible())]
-      : [GridItem(.adaptive(minimum: ThemeCardMetrics.gridItemMinimum), spacing: ThemeCardMetrics.gridSpacing)]
+      : [GridItem(.adaptive(minimum: gridItemMinimum), spacing: gridSpacing)]
   }
 
   var body: some View {
@@ -32,7 +38,7 @@ struct ThemesPurchaseSection: View {
       if ownsEveryTheme {
         allUnlockedCard
       } else {
-        LazyVGrid(columns: columns, spacing: ThemeCardMetrics.gridSpacing) {
+        LazyVGrid(columns: columns, spacing: gridSpacing) {
           ForEach(purchasableThemes) { theme in
             ThemePreviewCard(theme: theme, isOwned: isOwned(theme))
           }
@@ -64,14 +70,14 @@ struct ThemesPurchaseSection: View {
   }
 
   private var allUnlockedCard: some View {
-    VStack(spacing: ThemeCardMetrics.allUnlockedSpacing) {
+    VStack(spacing: allUnlockedSpacing) {
       Text(verbatim: "🎉")
-        .font(.system(size: ThemeCardMetrics.allUnlockedEmojiSize))
+        .font(.system(size: allUnlockedEmojiSize))
       Text(L10n.Settings.Support.Themes.allUnlocked)
         .font(.headline)
     }
     .frame(maxWidth: .infinity)
-    .padding(.vertical, ThemeCardMetrics.allUnlockedVerticalPadding)
+    .padding(.vertical, allUnlockedVerticalPadding)
     .listRowInsets(ThemeCardMetrics.gridRowInsets)
     .listRowBackground(Color.clear)
     .listRowSeparator(.hidden)
diff --git a/MC1Services/Sources/MC1Services/Services/BackupUserDefaults.swift b/MC1Services/Sources/MC1Services/Services/BackupUserDefaults.swift
index eab311b35..cd800a782 100644
--- a/MC1Services/Sources/MC1Services/Services/BackupUserDefaults.swift
+++ b/MC1Services/Sources/MC1Services/Services/BackupUserDefaults.swift
@@ -10,6 +10,7 @@ public struct BackupUserDefaults: Codable, Sendable, Equatable {
   public var mapStyleSelection: String?
   public var selectedThemeID: String?
   public var appColorSchemePreference: String?
+  public var appUITextSizePreference: String?
   public var mapShowLabels: Bool?
   public var mapNorthLocked: Bool?
   public var showDiscoveredNodesOnMap: Bool?
@@ -150,6 +151,7 @@ public struct BackupUserDefaults: Codable, Sendable, Equatable {
     (\.tracePathViewMode, AppStorageKey.tracePathViewMode.rawValue),
     (\.selectedThemeID, PersistenceKeys.selectedThemeID),
     (\.appColorSchemePreference, PersistenceKeys.appColorSchemePreference),
+    (\.appUITextSizePreference, PersistenceKeys.appUITextSizePreference),
   ]
 
   /// Key strings used by `stringMappings`. Internal solely for testability —
diff --git a/MC1Services/Sources/MC1Services/Utilities/PersistenceKeys.swift b/MC1Services/Sources/MC1Services/Utilities/PersistenceKeys.swift
index 6b6086d34..c04ef63a1 100644
--- a/MC1Services/Sources/MC1Services/Utilities/PersistenceKeys.swift
+++ b/MC1Services/Sources/MC1Services/Utilities/PersistenceKeys.swift
@@ -23,4 +23,7 @@ public enum PersistenceKeys {
 
   /// App color-scheme preference raw value (`"system"` | `"light"` | `"dark"`). Bare string.
   public static let appColorSchemePreference = "appColorSchemePreference"
+
+  /// App text-size preference raw value (`"system"` | `"large"` | `"xLarge"` | `"xxLarge"`). Bare string.
+  public static let appUITextSizePreference = "appUITextSizePreference"
 }
diff --git a/MC1Tests/ThemeServiceTests.swift b/MC1Tests/ThemeServiceTests.swift
index b9704b9d1..a172c41db 100644
--- a/MC1Tests/ThemeServiceTests.swift
+++ b/MC1Tests/ThemeServiceTests.swift
@@ -91,6 +91,49 @@ struct ThemeServicePureTests {
     #expect(defaults.string(forKey: PersistenceKeys.appColorSchemePreference) == "dark")
   }
 
+  @Test
+  func `missing appUITextSizePreference uses .system without writing back`() {
+    let defaults = freshDefaults()
+    let service = ThemeService(store: emptyStore(), defaults: defaults)
+    #expect(service.uiTextSizePreference == .system)
+    #expect(defaults.object(forKey: PersistenceKeys.appUITextSizePreference) == nil)
+  }
+
+  @Test
+  func `unknown appUITextSizePreference falls back to .system and overwrites`() {
+    let defaults = freshDefaults()
+    defaults.set("auto", forKey: PersistenceKeys.appUITextSizePreference)
+    let service = ThemeService(store: emptyStore(), defaults: defaults)
+    #expect(service.uiTextSizePreference == .system)
+    #expect(defaults.string(forKey: PersistenceKeys.appUITextSizePreference)
+      == AppUITextSizePreference.system.rawValue)
+  }
+
+  @Test
+  func `setUITextSizePreference persists the raw value and updates state`() {
+    let defaults = freshDefaults()
+    let service = ThemeService(store: emptyStore(), defaults: defaults)
+    service.setUITextSizePreference(.xLarge)
+    #expect(service.uiTextSizePreference == .xLarge)
+    #expect(defaults.string(forKey: PersistenceKeys.appUITextSizePreference) == "xLarge")
+  }
+
+  @Test
+  func `AppUITextSizePreference maps to the expected dynamicTypeSize values`() {
+    #expect(AppUITextSizePreference.system.dynamicTypeSize == nil)
+    #expect(AppUITextSizePreference.large.dynamicTypeSize == .xLarge)
+    #expect(AppUITextSizePreference.xLarge.dynamicTypeSize == .xxLarge)
+    #expect(AppUITextSizePreference.xxLarge.dynamicTypeSize == .accessibility1)
+  }
+
+  @Test
+  func `AppUITextSizePreference maps to the expected uiScale values`() {
+    #expect(AppUITextSizePreference.system.uiScale == 1.0)
+    #expect(AppUITextSizePreference.large.uiScale == 1.2)
+    #expect(AppUITextSizePreference.xLarge.uiScale == 1.35)
+    #expect(AppUITextSizePreference.xxLarge.uiScale == 1.5)
+  }
+
   @Test
   func `effectiveColorScheme: default theme defers to the preference`() {
     let service = ThemeService(store: emptyStore(), defaults: freshDefaults())
@@ -173,6 +216,42 @@ struct ThemeServicePureTests {
       == AppColorSchemePreference.system.rawValue)
   }
 
+  @Test
+  func `refreshFromUserDefaults adopts an externally written text-size preference`() {
+    let defaults = freshDefaults()
+    let service = ThemeService(store: emptyStore(), defaults: defaults)
+    defaults.set("large", forKey: PersistenceKeys.appUITextSizePreference)
+
+    service.refreshFromUserDefaults()
+
+    #expect(service.uiTextSizePreference == .large)
+  }
+
+  @Test
+  func `refreshFromUserDefaults overwrites an unknown text-size preference with .system`() {
+    let defaults = freshDefaults()
+    let service = ThemeService(store: emptyStore(), defaults: defaults)
+    defaults.set("auto", forKey: PersistenceKeys.appUITextSizePreference)
+
+    service.refreshFromUserDefaults()
+
+    #expect(service.uiTextSizePreference == .system)
+    #expect(defaults.string(forKey: PersistenceKeys.appUITextSizePreference)
+      == AppUITextSizePreference.system.rawValue)
+  }
+
+  @Test
+  func `restore-origin downgrade: an unknown backed-up text-size falls back to .system on init`() {
+    let defaults = freshDefaults()
+    var prefs = BackupUserDefaults()
+    prefs.appUITextSizePreference = "auto" // a future raw value this build doesn't know
+    prefs.restore(to: defaults) // write-if-missing writes "auto"
+    let service = ThemeService(store: emptyStore(), defaults: defaults)
+    #expect(service.uiTextSizePreference == .system)
+    #expect(defaults.string(forKey: PersistenceKeys.appUITextSizePreference)
+      == AppUITextSizePreference.system.rawValue)
+  }
+
   @Test
   func `restore-origin downgrade: an unknown backed-up scheme falls back to .system on init`() {
     let defaults = freshDefaults()