---
title: React Native SDK prior to v4
slug: feature-experimentation/docs/javascript-react-native-sdk-prior-to-v4
docTags: 
createdAt: 2026-08-05T20:39:52.000Z
---

## Version

This documentation is for React Native SDK versions 3.x and earlier.

For the latest React Native documentation, see [React Native SDK v4+](docId\:fhmei2bJqtDOo5jrkzYET).

For the current version number of this SDK, see [SDK Compatibility Matrix](docId:2shbZfPCkPAZ0mlZpL1TU).

## Reference

For reference documentation, see the left-hand menu, or start with [installing the React Native SDK](docId\:xQ_8Rfi1K-xtj_8PBK4Li).

## Source files

- [React SDK repo on GitHub](https://github.com/optimizely/react-sdk)
- [Changelog](https://github.com/optimizely/react-sdk/blob/master/CHANGELOG.md)

### Expo React Native sample app

For information on how to install and use the [Optimizely React SDK](https://github.com/optimizely/react-sdk) with [Expo](https://docs.expo.dev/), see the `expo-react-native-sdk-sample` GitHub repository.