keychain-synced-storage

A secure, encrypted, Keychain/Keystore-backed storage adapter for Expo and React Native (version 0.9.0). It maintains an in-memory Map for synchronous reads/writes while automatically encrypting data with a device-keychain-protected key and persisting the encrypted blob to AsyncStorage asynchronously. Supports isolated custom data namespaces for sensitive app data, biometric/passcode protection, and transparent integration with existing storage APIs. Alternative to react-native-encrypted-storage and expo-secure-store with a focus on session persistence and minimal API overhead. Active development; release cadence is irregular.