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RxDB

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The easiest way to store and sync data inside your JavaScript application.

Data & DatabasesDeveloper Tools
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Tracked since2026
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The Bottom Line

Entry price

Free, no paid tier

Biggest pro

Enables applications to work offline seamlessly

Biggest con

Requires JavaScript knowledge

TL;DR - RxDB

  • A local-first NoSQL database for JavaScript applications.
  • Enables offline functionality and zero-latency queries.
  • Provides real-time data synchronization with various backends.
Pricing: Free forever
Best for: Individuals & startups

What is RxDB?

Editorial review
RxDB is a NoSQL database designed for JavaScript applications, operating directly within the client-side environment. It champions a local-first architecture, enabling applications to function seamlessly offline with zero-latency queries. This design significantly enhances user experience by ensuring data availability and responsiveness regardless of network connectivity. The database includes a powerful Sync Engine that facilitates real-time synchronization between client applications and various backend systems. It offers pre-built replication plugins for popular services like GraphQL, Firebase, Supabase, MongoDB, and CouchDB, as well as the flexibility to integrate with custom servers through simple API endpoints. RxDB is ideal for developers building robust, offline-capable applications that require real-time data updates and efficient data management across multiple platforms and environments.

Available on: Web, iOS, Android, Windows, macOS, Linux

how we evaluateSourcerxdb.info ↗

Pros & Cons

Pros

  • Enables applications to work offline seamlessly
  • Provides zero-latency local queries
  • Reduces backend load and improves scalability
  • Simplifies and speeds up development of real-time applications
  • Offers robust features for data management like replication and conflict resolution

Cons

  • Requires JavaScript knowledge
  • May have a learning curve for new users unfamiliar with local-first databases

Preview

Key Features

Local-first design for offline functionalityReal-time synchronization with various backends (e.g., GraphQL, Firebase, MongoDB)Observable queries for instant UI updatesSupports all JavaScript runtimesSchema validationConflict handlingData migrationEncryption

Pricing

Free

RxDB is completely free to use with no hidden costs.

View pricing

Is RxDB worth the price?

100/100

RxDB offers a completely free pricing model, which is exceptionally generous compared to most commercial database solutions.

This makes it an incredibly fair and accessible option for all users, as there are no hidden costs or tiered features to worry about. It's best for developers and projects of all sizes looking for a robust, client-side database without any financial commitment.

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RxDB FAQ

Which specific backend technologies can RxDB directly synchronize with using prebuilt replication plugins?

RxDB offers prebuilt replication plugins for synchronization with various backend technologies, including RxServer, GraphQL, Firebase, Supabase, MongoDB, NATS, HTTP, CouchDB, WebRTC (P2P), Appwrite, and Google Drive.

How does RxDB facilitate synchronization with a custom server if prebuilt plugins are not used?

When not using prebuilt plugins, RxDB allows synchronization with a custom server by implementing only three simple endpoints. This provides flexibility for integrating with bespoke backend solutions.

What are the benefits of RxDB's local-first approach for application development?

The local-first approach enables applications to run offline, perform local queries with zero latency, and simplifies development. It also reduces backend load and improves scalability by handling data locally.

Can RxDB handle large datasets, such as tens of thousands of documents, while maintaining performance?

Yes, RxDB is designed to handle large datasets efficiently. For example, Readwise utilizes RxDB for users with tens of thousands of documents, citing its cross-platform, offline-first capabilities and performance as key factors.

What advanced features does RxDB offer beyond basic data storage and synchronization?

RxDB provides a comprehensive set of advanced features including Logging, Replication, ORM, Conflict Handling, Backup, Encryption, Middleware, Server, Compression, Signals, Storages, Local Documents, Schema Validation, Attachments, State Migration, CRDT, Population, and WebMCP.

Source: rxdb.info

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