# Expo

An open-source framework for making universal native apps with React. Expo runs on Android, iOS, and the web.

Repository: https://github.com/expo/expo
Canonical: https://ross.abutalabs.com/products/expo
Homepage: https://docs.expo.dev
Language: TypeScript
License: MIT
License Family: permissive
Topics: mobile, expo, native, web, universal, react, android, ios, app-framework, web-framework, native-apps, javascript, framework, frontend, react-native, typescript
Last push: 2026-08-26T23:27:55+00:00

## Health v2 (maintenance only)
Score: 67/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 8, longevity 100
- inputs: {"age_days": 3670, "days_push": 7, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 51842, forks 13657 (observed 2026-08-28T04:12:11.937114+00:00)

## What it is
Expo is an open-source framework and toolchain for building universal native apps with React and React Native, targeting Android, iOS, and the web from a single codebase. It includes SDK libraries, a file-based router, the EAS build/deploy CLI, and managed workflows for development, testing, and release.

## Use cases
- build a react native app for ios and android from one codebase
- create a cross-platform mobile app that also runs on the web
- set up over-the-air updates and app store builds without managing xcode and android studio
- scaffold a new react native project quickly
- add file-based routing and navigation to a react native app
- build and submit mobile apps to app stores from ci

## When to choose
- you want a single TypeScript/React codebase for Android, iOS, and web
- you prefer managed tooling for builds, updates, and deployment
- your team is new to native mobile development
- you need rapid iteration with hot reload and cloud builds

## When to avoid
- you need deep custom native code or niche native modules not supported by the SDK
- you are building a non-React app or a pure native Swift/Kotlin project
- you require minimal app size and cannot tolerate the Expo runtime
- you need fine-grained control over every native build configuration

## Facets
- artifact type: framework
- maturity: stable
- function: mobile-framework, frontend-framework, build-tool, cli, developer-tools
- domain: mobile-development, web-development, cross-platform, frontend, developer-tools
- platform: cross-platform
- tags: react-native, expo, universal-apps, app-framework, eas, over-the-air-updates, android, ios, web, nodejs, typescript

## Member repositories
- expo/expo (main) score 67
- expo/create-react-native-app (plugin) score 32
- expo/examples (examples) score 76
- expo/expo-cli (plugin) score 10
- expo/router (mirror) score 10
- expo/eas-cli (plugin) score 95
- expo/expo-server-sdk-node (sdk) score 95
- expo/expo-github-action (plugin) score 77

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:12:11.937114+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T16:19:41.032541+00:00, confidence not recorded.
  - readme: https://github.com/expo/expo (fetched 2026-08-28T04:12:11.937114+00:00, sha 63b46e484c04)
- Data as of 2026-08-30T08:39:29.467469+00:00.