Expo App Design
Build native-feeling Expo screens — Apple HIG styling, semantic colors, and native UI patterns.
expo-router
Framework (OSS). Navigation and routing for Expo Router. Covers file-based routes, groups and dynamic routes, folder organization, Link with previews and context menus, native Stack, page titles, modals and form sheets, NativeTabs, headers and toolbars, and header search bars.
Full skill instructions
Navigation and routing for Expo Router apps. For screen styling, colors, controls, media, and visual effects, use the expo-native-ui skill; for motion and gestures, use expo-animation.
Consult these resources as needed:
references/
route-structure.md Route conventions, dynamic routes, groups, folder organization
tabs.md NativeTabs, migration from JS tabs, iOS 26 features
toolbar-and-headers.md Stack headers and toolbar buttons, menus, search (iOS only)
form-sheet.md Form sheets in expo-router: configuration, footers and background interaction.
search.md Search bar with headers, useSearch hook, filtering patterns
zoom-transitions.md Apple Zoom: fluid zoom transitions with Link.AppleZoom (iOS 18+)
comment-card.tsxSee ./references/route-structure.md for detailed route conventions.
app directory.Color from expo-router for native semantic colors, not raw PlatformColor (type-safe, auto-adapts to light/dark). See expo-native-ui for the full color palette pattern.@react-navigation/* directly — use expo-router/react-navigation instead (covers @react-navigation/native, /core, /elements, /routers)Stack.SearchBar to add a search bar to a screenUse <Link href="/path" /> from 'expo-router' for navigation between routes.
import { Link } from 'expo-router';
// Basic link
<Link href="/path" />
// Wrapping custom components
<Link href="/path" asChild>
<Pressable>...</Pressable>
</Link>
Whenever possible, include a <Link.Preview> to follow iOS conventions. Add context menus and previews frequently to enhance navigation.
_layout.tsx files to define stacksSet the page title with Stack.Title:
<Stack.Title>Home</Stack.Title>
Add long press context menus to Link components:
import { Link } from "expo-router";
<Link href="/settings" asChild>
<Link.Trigger>
<Pressable>
<Card />
</Pressable>
</Link.Trigger>
<Link.Menu>
<Link.MenuAction
title="Share"
icon="square.and.arrow.up"
onPress={handleSharePress}
/>
<Link.MenuAction
title="Block"
icon="nosign"
destructive
onPress={handleBlockPress}
/>
<Link.Menu title="More" icon="ellipsis">
<Link.MenuAction title="Copy" icon="doc.on.doc" onPress={() => {}} />
<Link.MenuAction
title="Delete"
icon="trash"
destructive
onPress={() => {}}
/>
</Link.Menu>
</Link.Menu>
</Link>;
Use link previews frequently to enhance navigation:
<Link href="/settings">
<Link.Trigger>
<Pressable>
<Card />
</Pressable>
</Link.Trigger>
<Link.Preview />
</Link>
Link preview can be used with context menus.
Present a screen as a modal:
<Stack.Screen name="modal" options={{ presentation: "modal" }} />
Prefer this to building a custom modal component.
Present a screen as a dynamic form sheet:
<Stack.Screen
name="sheet"
options={{
presentation: "formSheet",
sheetGrabberVisible: true,
sheetAllowedDetents: [0.5, 1.0],
contentStyle: { backgroundColor: "transparent" },
}}
/>
contentStyle: { backgroundColor: "transparent" } makes the background liquid glass on iOS 26+.A standard app layout with tabs and stacks inside each tab:
app/
_layout.tsx — <NativeTabs />
(index,search)/
_layout.tsx — <Stack />
index.tsx — Main list
search.tsx — Search view
// app/_layout.tsx
import { NativeTabs } from "expo-router/unstable-native-tabs";
import { ThemeProvider, DarkTheme, DefaultTheme } from "expo-router/react-navigation";
import { useColorScheme } from "react-native";
export default function Layout() {
const colorScheme = useColorScheme();
return (
<ThemeProvider value={colorScheme === "dark" ? DarkTheme : DefaultTheme}>
<NativeTabs>
<NativeTabs.Trigger name="(index)">
<NativeTabs.Trigger.Icon sf="list.dash" md="list" />
<NativeTabs.Trigger.Label>Items</NativeTabs.Trigger.Label>
</NativeTabs.Trigger>
<NativeTabs.Trigger name="(search)" role="search" />
</NativeTabs>
</ThemeProvider>
);
}
Create a shared group route so both tabs can push common screens:
// app/(index,search)/_layout.tsx
import { Stack } from "expo-router/stack";
import { colors } from "@/theme/colors";
export default function Layout({ segment }) {
const screen = segment.match(/\((.*)\)/)?.[1]!;
const titles: Record<string, string> = { index: "Items", search: "Search" };
return (
<Stack
screenOptions={{
headerTransparent: true,
headerShadowVisible: false,
headerLargeTitleShadowVisible: false,
headerLargeStyle: { backgroundColor: "transparent" },
headerTitleStyle: { color: colors.label },
headerLargeTitleEnabled: true,
headerBlurEffect: "none",
headerBackButtonDisplayMode: "minimal",
}}
>
<Stack.Screen name={screen} options={{ title: titles[screen] }} />
<Stack.Screen name="i/[id]" options={{ headerLargeTitleEnabled: false }} />
</Stack>
);
}
headerLargeTitleEnabled is the SDK 56+ option name; older SDKs use headerLargeTitle, which is deprecated upstream.
If you encounter errors, misleading or outdated information in this skill, report it so Expo can improve:
npx --yes submit-expo-feedback@latest --category skills --subject "expo-router" "<actionable feedback>"
Only submit when you have something specific and actionable to report. Include as much relevant context as possible. If an AI agent repeatedly failed or the user had to take over an Expo task, load the expo-skill-feedback skill and follow its eval-candidate flow instead of reusing the command above.
Build native-feeling Expo screens — Apple HIG styling, semantic colors, and native UI patterns.
expo brownfield
Safely upgrade Expo SDK versions with migration guidance and breaking change resolution.
Framework (OSS). Use when implementing or debugging ANY network request, API call, or data fetching. Covers fetch API, React Query, SWR, error handling, caching, offline support, and Expo Router data loaders (`useLoaderData`).
Framework (OSS). Expo's official example projects - the expo/examples repo of ~70 `with-*` integrations (Stripe, Clerk, Supabase, OpenAI, maps, Reanimated, SQLite, Skia, NativeWind, and more). Use when integrating a third-party library or service into an existing Expo app and you want the canonical, version-matched pattern to adapt, or when scaffolding a new project from one with `npx create-expo --example`.
Deploy Expo apps to production with EAS Build and app store submission workflows.
Evaluate Expo skills in this repo end-to-end - trigger accuracy, generated code quality, and runtime screenshots on iOS simulator and Android emulator via Expo Go (web optional). Use when the user wants to eval an Expo skill, test that a skill produces working code, benchmark a skill with device screenshots, or verify a skill's output renders correctly.
EAS service (paid). Helps understand and write EAS workflow YAML files for Expo projects. Use this skill when the user asks about CI/CD or workflows in an Expo or EAS context, mentions .eas/workflows/, or wants help with EAS build pipelines or deployment automation.
Framework (OSS). Use Expo DOM components to run web code in a webview on native and as-is on web. Migrate web code to native incrementally. For the end-to-end migration of a whole web app, use the expo-web-to-native skill.
EAS service (paid). Run and control a user's app on a remote iOS/Android simulator hosted on EAS cloud. Read before running any `eas simulator:*` commands - it has the current syntax for this experimental API. Use whenever the user needs a simulator they can't run locally - 'run my app on a cloud simulator', 'use eas simulator to run/install/screenshot my app', 'I'm on Linux/Cursor and need an iOS device', 'no sim on this box / headless CI', 'let an agent click through my app and screenshot it', 'test my dev build on a remote sim with live reload', 'stream a sim to my browser' - even when they don't say 'EAS Simulator' or 'cloud'. On a host WITHOUT a local simulator (Linux, CI, cloud sandbox) it's the default; on macOS, do NOT auto-trigger for a plain 'run on the simulator' - use it only for a cloud/remote/shareable sim, an iOS version they lack, or an agent-driven session. NOT for local sims (expo run:ios, Xcode, Android Studio), EAS Build/Update, web preview, or physical devices.
Framework (OSS). Add an iOS App Clip target to an Expo app. Use when the user mentions App Clip, AASA, apple-app-site-association, appclips, smart app banner, or wants to ship a lightweight iOS Clip invoked from a URL alongside their parent app.
Framework (OSS). Migrate an existing web React app to a native iOS/Android app with Expo. Use when the user wants to turn a website into a mobile app, port a Next.js/Vite/CRA React codebase to React Native, reuse web code on native incrementally, or asks how web idioms (the DOM, CSS, React Router, localStorage, window) map to native. This is the end-to-end migration guide; use the `expo-dom` skill for the DOM-component mechanism itself.
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