TypeScript library and local‑first platform
Standard library
A tree-shakable TypeScript library that fits in your head.
Type
Runtime types, typed errors and formatters. All branded.
Task
Structured concurrency built on JavaScript Promises.
Lightweight
Runtime types, structured concurrency, logging: 5.1 kB.
Batteries included
Helpers for Array, Object, etc. Eq, Order, Time, and more.
Result
Typed errors. No try/catch. Exhaustive error handling.
Universal
Web, React Native, Electron, Solid, Vue, Svelte, and more.
Idiomatic JavaScript
Minimal abstractions, native stack traces, debug-friendly.
Private by design
E2E encrypted sync and backup. Post-quantum safe.
Automatic cleanup
Resource management with the new JS using keyword.
Reactive SQLite
Local-first with reactive queries and React Suspense.
Developer experience
Readable source code, tests, DX-first API.
Real-time
WebSocket by default, other transports possible.
Type-safe SQL
Typed database schema and SQL with Kysely.
CRDT
Merging changes without conflicts. History preserved.
Free
MIT License, self-hostable Relay server.
Own your apps and data.
Work offline, sync online.
No vendor lock‑in.*
*Of course, SQLite and Evolu are kind of lock‑in, but replaceable because SQL is standard, and Evolu is just a thin layer on standard APIs.