RxDB
Stuttgart, Germany
What it is
RxDB is a NoSQL database for JavaScript that runs inside an application. It stores data on the client and supports offline operation, including configurations that work without a backend. When synchronization is needed, its Sync Engine connects with backends such as RxServer, GraphQL, Firebase, Supabase, MongoDB, NATS, HTTP, CouchDB, WebRTC, Appwrite, Google Drive, and Microsoft OneDrive. Observable queries update when stored data changes. RxDB runs in browsers, mobile apps, desktop applications, and servers. Documented storage choices include LocalStorage, IndexedDB, OPFS, Memory, Node.js Filesystem, SQLite, Expo Filesystem, Dexie.js, MongoDB, DenoKV, and FoundationDB. Collections use JSON Schema with validation and migration support. An encryption plugin protects local documents with a password and works in browsers, React Native, and Node.js. The free tier is under the Apache 2.0 license, permits up to 13 open collections in parallel, and includes community support through GitHub and Discord. Pro costs $99/mo billed annually; Pro Plus costs $239/mo billed annually. Enterprise includes a support SLA with a 24-hour first response.
For and against
For
- Can operate offline without a backend.
- Supports synchronization with a range of backends.
- Observable queries update when stored data changes.
- Collections support JSON Schema validation and migrations.
- Encryption plugin works in browsers, React Native, and Node.js.
Against
- Free tier allows up to 13 open collections in parallel.
- Free users receive community support.
- Pro starts at $99/mo billed annually.
- LocalStorage is intended for very small datasets.
The verdict
RxDB provides local-first storage, synchronization, and reactive queries across several JavaScript environments. The free tier has a collection limit, while paid plans add storage and other capabilities.
Who it suits
RxDB suits JavaScript developers building applications that need local data, offline operation, or synchronization with supported backends. Its runtime and storage options span browsers, mobile and desktop apps, and servers.
Plans and prices
Free
RxDB core · replication and realtime sync · default storages · up to 13 open collections
Read 2 Oct 2026 · rxdb.info
Pro
OPFS · IndexedDB · SQLite · Filesystem
Read 2 Oct 2026 · rxdb.info
Pro Plus
Worker and Shared Worker storage · Sharding · Memory-Mapped · optimizers
Read 2 Oct 2026 · rxdb.info
Enterprise
custom commercial license · named engineer · 24-hour first-response SLA · architecture review
Read 2 Oct 2026 · rxdb.info
On the record
- Encryption
- The encryption plugin encrypts locally stored documents with a password and works in browsers, React Native, and Node.js.rxdb.info · read 2 Oct 2026
- Free limit
- The Free tier allows up to 13 open collections in parallel.rxdb.info · read 2 Oct 2026
- License
- The free tier is under the Apache 2.0 license.rxdb.info · read 2 Oct 2026
- Offline-first
- RxDB stores data locally on the client, supports offline operation, and can run entirely without a backend.rxdb.info · read 2 Oct 2026
- Product
- RxDB is a NoSQL database for JavaScript that runs directly in an app.rxdb.info · read 2 Oct 2026
- Production privacy
- Deployed applications do not make requests from users to an RxDB server, and the premium plugins contain no tracking code.rxdb.info · read 2 Oct 2026
- Reactivity
- RxDB provides observable realtime queries that update when stored data changes.rxdb.info · read 2 Oct 2026
- Runtimes
- RxDB runs in browsers, mobile apps, desktop applications, and servers.rxdb.info · read 2 Oct 2026
- Schema
- RxDB uses JSON Schema for collections, with schema validation and migration support.rxdb.info · read 2 Oct 2026
- 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.rxdb.info · read 2 Oct 2026
- Storage
- Documented storage options include LocalStorage, IndexedDB, OPFS, Memory, Node.js Filesystem, SQLite, Expo Filesystem, Dexie.js, MongoDB, DenoKV, and FoundationDB.rxdb.info · read 2 Oct 2026
- Support
- Free users receive community support through GitHub and Discord, while Enterprise includes a support SLA with a 24-hour first response.rxdb.info · read 2 Oct 2026
- 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.rxdb.info · read 2 Oct 2026
