React Native MMKV

React Native MMKV works in React Native apps on Android and iOS. Category: Database & Storage. Pricing: open source.

React Native MMKV is the fastest key-value storage library for React Native, leveraging the MMKV storage framework originally built by WeChat — delivering read and write speeds approximately 30x faster than AsyncStorage.

With synchronous reads, AES encryption support, and a simple key-value API, MMKV is the go-to replacement for AsyncStorage in performance-critical React Native apps — handling user preferences, session tokens, and cached data without the async overhead that causes UI jank.

When to use React Native MMKV in a React Native app

1. Eliminate UI stutter caused by slow storage reads. MMKV's synchronous API means you read user preferences and session tokens instantly on the JS thread — no await, no loading states, no flickering UI while your app waits for AsyncStorage to return a value.
2. Secure sensitive data with built-in AES encryption. MMKV supports transparent encryption with a single encryptionKey parameter — store auth tokens, API keys, and user data with encryption-at-rest without integrating a separate keychain library.
3. Drop in as an AsyncStorage replacement in minutes. MMKV's API mirrors AsyncStorage closely, and community wrappers make migration trivial — so you get a 30x storage performance improvement with a minimal diff to your existing code.