Create, remix and share UI components with AI
21st.dev is the largest React component registry for AI applications, used by 1.4M developers (200K MAU). We provide the building blocks to create AI agents and agent-powered apps: UI components, agent templates, and an SDK with built-in UI, tools, memory, observability, and managed infrastructure.
21st.dev organizes components into 40+ categories (buttons, forms, pricing sections, navigation, etc.) with 1,000+ total components, enabling developers to quickly locate and implement components for specific use cases like pricing displays, hero sections, or AI chat interfaces.
21st.dev combines UI components with Agents SDK, templates, and MCP tools designed for agentic internet applications, enabling developers to ship AI-powered products more quickly by combining pre-built components with AI infrastructure.
21st.dev provides thousands of community-made React components optimized for Tailwind CSS and Next.js, allowing developers to copy and remix components instead of building from scratch, reducing development time and maintaining design consistency.
21st.dev's community platform showcases components from multiple designers and developers, allowing users to explore different design approaches, remix existing components, and contribute their own, fostering knowledge sharing and design pattern discovery.