What is shadcn/ui?
A collection of copy-paste React components built on Radix primitives and styled with Tailwind CSS.
shadcn/ui is not a traditional npm package — you copy component source code into your project and own it completely. Components are accessible (built on Radix UI primitives), styled with Tailwind CSS, and fully customizable. It's the default component library for the AI app builder ecosystem because its systematic class names produce reliable AI-generated output.