SignalDBReactive Local-First JavaScript Database

Signals for instant UI updates, plus real-time sync when you need it.

Signal-Based Reactivity

SignalDB is a reactive JavaScript database powered by signals for instant UI updates. Works with any framework, with adapters for Angular, Solid.js, React, Vue, and more.

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Local-First

A local-first database that keeps apps fast and usable offline. Data syncs automatically when you’re back online for a smooth offline-first experience.

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Real-Time Synchronization

Built-in real-time sync keeps data consistent across clients and servers. Includes conflict handling for reliable collaborative and multi-device apps.

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Developer Friendly

Full TypeScript support with a familiar MongoDB-like query API. Model relationships easily with the built-in ORM.

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Optimistic UI

Ship snappy apps with optimistic UI—updates render instantly while sync runs in the background.

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Developer Tools

Use devtools to inspect queries, changes, and performance in real time. Debug faster and spot bottlenecks early.

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Backend Agnostic

Sync works with REST, GraphQL, or custom APIs. Plug into your existing server without rewrites.

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Storage Adapters

Persist data anywhere with flexible storage adapters. Includes support for IndexedDB, OPFS, and more.

Local-first Sync, Visualized

Two clients keep a shared list in sync automatically. Toggle offline to pause push/pull, create edits on either side, and watch field-level conflicts resolve while the server view updates below.

OfflinePending: 0

Server

Sketch offline edits
order: 1.00
Resolve field conflicts
order: 2.00
~~Reorder with drag & drop~~
order: 3.00

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