The open source
application stack
for the web

Headless, type-safe, composable tools for building modern web applications that work naturally for developers and reliably for agents

18.4BTotal Downloads176,697,797Weekly Downloads128,220GitHub Stars

Principles

Our libraries are built around real products and the developers shipping them.

Portable core
Framework Agnostic
Our library cores are provider-agnostic and logic-driven, meaning you can use the same logic in React, Vue, Svelte, Solid, and more.
Compile-time contracts
Type-Safe by Design
Built with TypeScript from the ground up, providing incredible autocomplete and safety across your entire data-fetching and state management stack.
params.postIdstring
query.dataProject[]
form.emailField<string>
Real workloads
Production-Grade
Battle-tested in the world's largest apps. We build for scale, handling complex concurrency, caching, and state synchronization with ease.
npm downloads18,383,011,464
per week176,697,797
github stars128,220
Independent tools
No Vendor Lock-in
Open source and independent. We aren't beholden to any single cloud provider or framework team, ensuring the best tools for the community.
license
MIT
hosting
self-host anywhere
governance
community-driven
paid tiers
none