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RxDB
rxdb.info
What it is
RxDB is a NoSQL database for JavaScript that runs inside an application and keeps data locally on the client. It supports offline operation, including applications that run entirely without a backend. When synchronization is needed, its Sync Engine connects to backends including RxServer, GraphQL, Firebase, Supabase, MongoDB, NATS, HTTP, CouchDB, WebRTC, Appwrite, Google Drive, and Microsoft OneDrive. Observable queries update as stored data changes. RxDB runs in browsers, mobile apps, desktop applications, and servers, with storage options including LocalStorage, IndexedDB, OPFS, SQLite, Node.js Filesystem, Expo Filesystem, MongoDB, and FoundationDB, among others. Collections use JSON Schema with validation and migration support. An encryption plugin protects locally stored documents with a password in browsers, React Native, and Node.js. The free tier is under Apache 2.0 and allows up to 13 open collections in parallel. Free users get community support through GitHub and Discord; Enterprise includes an SLA with a 24-hour first response. Pro costs $99 a month billed annually, and Pro Plus costs $239 a month billed annually.
Spec sheet
- Product
- RxDB is a NoSQL database for JavaScript that runs directly in an app.Read 2 Oct 2026 · rxdb.info
- Support
- Free users receive community support through GitHub and Discord, while Enterprise includes a support SLA with a 24-hour first response.Read 2 Oct 2026 · rxdb.info
- License
- The free tier is under the Apache 2.0 license.Read 2 Oct 2026 · rxdb.info
- Headquarters
- Stuttgart, GermanyRead 28 Sep 2026 · rxdb.info
- Encryption
- The encryption plugin encrypts locally stored documents with a password and works in browsers, React Native, and Node.js.Read 2 Oct 2026 · rxdb.info
- Free limit
- The Free tier allows up to 13 open collections in parallel.Read 2 Oct 2026 · rxdb.info
- Offline-first
- RxDB stores data locally on the client, supports offline operation, and can run entirely without a backend.Read 2 Oct 2026 · rxdb.info
- Production privacy
- Deployed applications do not make requests from users to an RxDB server, and the premium plugins contain no tracking code.Read 2 Oct 2026 · rxdb.info
- Reactivity
- RxDB provides observable realtime queries that update when stored data changes.Read 2 Oct 2026 · rxdb.info
- Runtimes
- RxDB runs in browsers, mobile apps, desktop applications, and servers.Read 2 Oct 2026 · rxdb.info
- Schema
- RxDB uses JSON Schema for collections, with schema validation and migration support.Read 2 Oct 2026 · rxdb.info
- Small datasets
- The LocalStorage storage is intended for simple browser setups and very small datasets and is not optimized for large data or heavy writes.Read 2 Oct 2026 · rxdb.info
- Storage
- Documented storage options include LocalStorage, IndexedDB, OPFS, Memory, Node.js Filesystem, SQLite, Expo Filesystem, Dexie.js, MongoDB, DenoKV, and FoundationDB.Read 2 Oct 2026 · rxdb.info
- Synchronization
- Its Sync Engine supports realtime synchronization with backends including RxServer, GraphQL, Firebase, Supabase, MongoDB, NATS, HTTP, CouchDB, WebRTC, Appwrite, Google Drive, and Microsoft OneDrive.Read 2 Oct 2026 · rxdb.info
Plans and prices
Free Free forever RxDB core · replication and realtime sync · default storages · up to 13 open collections · community support Read 2 Oct 2026 · rxdb.info
Pro $99 a month annually, unlimited developers OPFS · IndexedDB · SQLite · Filesystem · WebCrypto Encryption · Fulltext Search Read 2 Oct 2026 · rxdb.info
Pro Plus $239 a month annually, unlimited developers Worker and Shared Worker storage · Sharding · Memory-Mapped · optimizers · Fastify/Koa adapters · Sentry-compatible logger Read 2 Oct 2026 · rxdb.info
Enterprise Priced on request custom commercial license · named engineer · 24-hour first-response SLA · architecture review · priority fixes · source-code access Read 2 Oct 2026 · rxdb.info
Strong points and limits
Strong points
- Supports offline use without a backend
- Syncs with a range of backends
- Schema validation and migrations are supported
- Local document encryption is available
Limits
- Free tier is limited to 13 open collections
- LocalStorage is intended for very small datasets
- Free users receive community support
Who it suits
RxDB suits JavaScript developers building offline-capable applications across browsers, mobile, desktop, or server environments. Its local-first approach can also suit apps that need to operate without a backend.
Verdict
RxDB combines local data storage with offline use, realtime queries, and optional synchronization. The free tier has a collection limit, while paid plans have listed annual-billing prices.
Where Specifiction places it
- Mobile Databases#9 of 268.1
- Embedded Databases#12 of 308.0
