shadcn/ui is a free, open-source React component collection built on Radix primitives and Tailwind CSS: distributed as copy-paste source code you own outright, not an installed npm package you update from a registry.
The copy-paste-not-installed model is the real differentiator: the components land directly in your own codebase as editable source, so customizing deeply doesn't mean fighting an external library's abstraction layer.
Excellent for teams building a custom Tailwind + React product who want a real accessible foundation (via Radix) without adopting a heavier, more opinionated component library like MUI.
Because you own the code directly, you also own keeping it updated: there's no single "upgrade" command the way a normal npm dependency would have.
Beautifully designed components you can customize and extend.
