frejs/fre

Health v2 · maintenance only

Adoption not part of the score

3765 stars · 348 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Fre is a tiny (~1KB brotli) concurrent UI library for JavaScript built on a Fiber architecture with a coroutine scheduler enabling time slicing. It offers a React-like API including hooks, Suspense, Fragments, memo, ErrorBoundary, and keyed reconciliation with SSR hydration.

Use cases

• build a lightweight react-like ui with hooks
• tiny frontend library under 2kb for a web app
• concurrent rendering with time slicing in javascript
• learn how a fiber reconciler works
• ssr hydration with a minimal vdom library
• replace react in a small bundle-size-sensitive project

When to choose

• bundle size is critical and you want react-like hooks and jsx
• you want to study or hack on a minimal fiber implementation
• you need concurrent rendering, suspense, and keyed diffing in a tiny package

When to avoid

• you need a mature ecosystem with large component libraries and tooling
• enterprise projects requiring long-term vendor support
• you rely on advanced react features like concurrent transitions APIs or react server components

Facets

library · maturity active

frontend-framework ui-components ssr state-management web-development frontend developer-tools browser cross-platform react-like fiber-architecture concurrent-rendering hooks virtual-dom jsx tiny-bundle time-slicing keyed-reconciliation suspense nodejs web-server

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