RxDB is a realtime database for JavaScript applications. It is designed to handle complex data structures, synchronization, and offline-first capabilities.
Free and open-source
Best WatermelonDB Alternatives ranked by AI · updated Aug 2026
WatermelonDB is an open-source reactive database optimized for React Native and other mobile applications. It uses SQLite-backed storage and lazy loading to handle larger local datasets efficiently on mobile devices.
Top 6 WatermelonDB alternatives
PouchDB is an open-source JavaScript database that syncs data across devices.
Electric provides outsourced IT support, endpoint management, onboarding, and employee-facing technology services for growing companies. Its platform combines a service desk with...
Pros
- Strong focus on modern employee IT and onboarding workflows
- Combines human support with a centralized IT operations platform
- Well suited to distributed and growing companies
Cons
- Less focused on traditional on-premises infrastructure than some MSPs
- Custom pricing limits quick budget comparisons
- May not fit organizations needing highly local, hands-on support
Custom pricing
SignalDB is an open-source reactive client-side database for JavaScript applications. It provides MongoDB-like queries and live updates for interfaces built with frameworks...
Pros
- Framework-agnostic reactive API based on signals
- MongoDB-like querying is familiar to JavaScript developers
- Smaller and simpler than full synchronization databases
Cons
- Smaller ecosystem and community than RxDB or Dexie
- Less mature offline synchronization tooling than PouchDB
- Primarily client-side rather than a complete backend database
Free, open source
5
Dexie
David Fahlander
Dexie is a JavaScript wrapper around the browser's IndexedDB storage system. It is aimed at developers who need structured local persistence, indexed...
Pros
- Simpler and lighter than SignalDB for browser-only persistence
- Excellent IndexedDB API with strong TypeScript support
- Dexie Observable provides reactive change notifications
Cons
- Browser-focused rather than broadly cross-platform
- Reactive features require additional APIs or packages
- Less database-like synchronization than RxDB
Free, open source; optional Dexie Cloud paid
6
TinyBase
TinyBase contributors
TinyBase is a small reactive data store for local-first JavaScript applications. It offers tables, relationships, checkpoints, persistence, synchronization utilities, and integrations for...
Pros
- Smaller and more focused than SignalDB for state-centric applications
- Strong framework integrations and reactive updates
- Built-in persistence, checkpoints, and synchronization primitives
Cons
- Less conventional database querying than SignalDB's MongoDB-like API
- Not intended as a full backend or server database
- Smaller ecosystem than Dexie or RxDB
Free, open source
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