RxDB

RxDB is ranked #3 of 30 in embedded databases on Freedom251. It runs on Android, API, iOS, Linux, macOS, Self-hosted, Web, Windows. There is a free plan. Paid plans start at $99/mo.

RxDB plans and pricing

All plans

Free Free forever RxDB core · replication and realtime sync · default storages · up to 13 open collections · community support rxdb.info · 2 Oct 2026

Pro $99/mo annually, unlimited developers OPFS · IndexedDB · SQLite · Filesystem · WebCrypto Encryption · Fulltext Search rxdb.info · 2 Oct 2026

Pro Plus $239/mo annually, unlimited developers Worker and Shared Worker storage · Sharding · Memory-Mapped · optimizers · Fastify/Koa adapters · Sentry-compatible logger rxdb.info · 2 Oct 2026

Enterprise Not published custom commercial license · named engineer · 24-hour first-response SLA · architecture review · priority fixes · source-code access rxdb.info · 2 Oct 2026

Compared on embedded databases

Free plan: Yes
Paid from: $99/mo

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Free6.7

RxDB

Product: RxDB is a NoSQL database for JavaScript that runs directly in an app.
Offline-first: RxDB stores data locally on the client, supports offline operation, and can run entirely without a backend.
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.
Reactivity: RxDB provides observable realtime queries that update when stored data changes.
Runtimes: RxDB runs in browsers, mobile apps, desktop applications, and servers.
Storage: Documented storage options include LocalStorage, IndexedDB, OPFS, Memory, Node.js Filesystem, SQLite, Expo Filesystem, Dexie.js, MongoDB, DenoKV, and FoundationDB.
Schema: RxDB uses JSON Schema for collections, with schema validation and migration support.
Encryption: The encryption plugin encrypts locally stored documents with a password and works in browsers, React Native, and Node.js.
License: The free tier is under the Apache 2.0 license.
Free limit: The Free tier allows up to 13 open collections in parallel.
Support: Free users receive community support through GitHub and Discord, while Enterprise includes a support SLA with a 24-hour first response.
Production privacy: Deployed applications do not make requests from users to an RxDB server, and the premium plugins contain no tracking code.
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.
Headquarters: Stuttgart, Germany
Price from: $99/mo

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Where it ranks on Freedom251

Best Embedded Databases in 2026#3 of 30
Best Mobile Databases in 2026#4 of 26

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Sources

rxdb.info· checked 2 Oct 2026
rxdb.info/quickstart.html· checked 2 Oct 2026
rxdb.info/overview.html· checked 2 Oct 2026
rxdb.info/encryption.html· checked 2 Oct 2026
rxdb.info/premium/· checked 2 Oct 2026