A free, open-source React component library built on Base UI, styled with Tailwind, animated with Motion — 70+ polished components for humans and AI agents.
ReactTailwindDesign Systems+3
appica.dev
21St
21st.dev
12,000+ hand-crafted React and Tailwind CSS components, templates, and shadcn themes you can preview live and install with one command.
What is 21St?
21st.dev is a living library of interfaces built by real design engineers: 2,000+ marketing blocks (animated heroes, shaders, gradients, footers) alongside 2,100+ UI components like AI chats, cards, galleries, and sign-in widgets. Preview any piece live, then copy the prompt or install with a single command. The workflows are designed for human developers and AI coding agents alike, with usage from indie makers up to large product teams.
Best for
- React and Tailwind components with one-command install
- Marketing blocks from animated heroes to gradient backgrounds
- shadcn themes for AI-assisted product development
Key features
- 12,000+ crafted React and Tailwind components
- 2,000+ marketing blocks: heroes, shaders, footers
- 2,100+ UI components including AI chats and 3D galleries
- Live preview with copy-prompt or one-command install
- Prompt-ready workflows for AI coding agents
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HeroUI v3 (formerly NextUI) — accessible React and React Native components built on React Aria and Tailwind CSS v4, with 27.7k GitHub stars.
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