shadcn/ui

This is a collection of beautifully designed, accessible, and customizable UI components built on top of Radix UI primitives and Tailwind CSS, created by shadcn in 2023, that developers copy and paste directly into their projects rather than installing as a npm package, giving full ownership and control over the component source code for unlimited customization, adopted by thousands of projects and companies including Vercel, Cal.com, Dub, and Documenso as the go-to component library for React applications. The copy-and-paste distribution model fundamentally differs from traditional component libraries by giving developers the actual component source code directly in their codebase, eliminating the constraints of a black-box dependency and enabling unlimited modification of structure, styling, and behavior without fighting library abstractions or overriding internal styles through fragile specificity hacks. The Radix UI foundation provides fully accessible, unstyled primitives for common UI patterns including dialogs, dropdowns, popovers, tooltips, accordions, tabs, and more, with proper ARIA attributes, keyboard navigation, focus management, and screen reader support built into the primitives, ensuring that components meet WCAG accessibility standards without additional effort. The Tailwind CSS styling enables rapid customization through utility classes and CSS variables, with a theming system using CSS custom properties for colors, border radius, spacing, and typography that supports light and dark modes, custom brand colors, and design token integration through tools like Figma and Tokens Studio. The component registry includes buttons, cards, dialogs, forms, tables, navigation, data display, overlays, and more. The CLI adds components with one command. The React Server Components compatibility enables usage in Next.js App Router. Designed for React developers, Next.js teams, and design system builders.