What it does
Preact is a JavaScript UI library for building web interfaces from components and a virtual DOM. Its guide describes a React-compatible API and offers a project initializer, a Vite-based path, and a no-build-tools route. It is useful for applications that want component-based rendering while evaluating a smaller alternative to React, though existing React integrations should be checked rather than assumed to work unchanged.
Preact's current v11 guide starts a new project with npm init preact. The initializer offers choices such as TypeScript, routing through preact-iso, and ESLint support; the guide also recommends Vite for developers new to Preact. A simple first task is to render a small page from a function component, then add one interaction before choosing the project's final tooling. Preact components can be functions that receive props and return JSX. If you are evaluating it for an existing React application, check the compatibility section before switching: the guide documents React aliasing and integration paths, but it does not promise that every React-specific dependency can be swapped without changes. That is the main practical choice between starting fresh and migrating an existing application.
The project is MIT-licensed. Preact is a separate UI library from React, not a React edition or hosting service; its React-compatible API is an interoperability feature, not proof that every React ecosystem package behaves identically.
Strengths
- The current guide provides a project initializer with choices for TypeScript, routing, and linting.
- Function components and JSX provide a familiar component-based workflow.
- The guide documents both Vite-based setup and a no-build-tools route.
Watch out for
- React compatibility does not guarantee every React-specific integration will work without checking its requirements.
- A new project still needs a chosen build and deployment path when the no-build-tools route is not a fit.
Best for
- Web applications built from reusable JavaScript components.
- Teams evaluating a compact alternative to React while keeping familiar component concepts.
- Projects that want to choose between a starter workflow and a more customized build pipeline.
Sources
- Preact (Oct 25, 2026)
- Getting Started - Preact Guide v11 (Oct 25, 2026)
- Components - Preact Guide v11 (Oct 25, 2026)
- preactjs/preact (Oct 25, 2026)
- MIT License (Oct 25, 2026)