Realm is a mobile database that runs directly inside phones, tablets, wearables, and Node.js environments as an alternative to SQLite and key-value stores.
Realm addresses the need for persistent data storage on mobile and edge devices by embedding a database engine directly into applications rather than requiring network calls to a backend. The tool exposes data as queryable objects, eliminating the abstraction layer of traditional ORMs. It supports relationships, generics, and vectorization, and performs faster than raw SQLite on common operations while offering a richer feature set.
Developers building React Native applications on iOS and Android, Node.js services, or Electron desktop applications should consider Realm when they need local data persistence with strong query capabilities. The tool suits projects where offline-first functionality or edge device data storage is important. The README does not compare Realm to alternative databases beyond mentioning SQLite and key-value stores as categories it replaces.
The project carries a significant caveat: the README announces the deprecation of Atlas Device Sync and the Realm SDKs, with a community-maintained version available as an alternative on npm. This deprecation status is central to evaluating adoption, as it signals that the official SDK will no longer receive updates, though a community branch continues development without sync features.
