The Expo SDK provides access to device and system functionality such as contacts, camera, and GPS location. You install modules from the Expo SDK using expo-cli with the expo install command:

You can import modules from it in your JavaScript code as follows:

import { Camera } from 'expo-camera';
import * as Contacts from 'expo-contacts';
import { Gyroscope } from 'expo-sensors';

This allows you to write Contacts.getContactsAsync() and read the contacts from the device, read the gyroscope sensor to detect device movement, or render a Camera view and take photos.

The easiest way to create a bare React Native app with support for the Expo SDK is npx create-react-native-app myapp. If you have an existing app that you would like to add Expo SDK packages to, read about integrating into existing apps.

Every quarter there is a new Expo SDK release that typically updates to the latest stable version of React Native and includes a variety of bugfixes, features and improvements to the Expo SDK. It's often useful to know what version of React Native your Expo project is running on, so the following table maps Expo SDK versions to their included React Native version.