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21st

Community registry of 10,000+ hand-crafted React and Tailwind CSS components and templates. Preview live, install with one command — for you and your AI agent.

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About 21st

21st.dev is the largest React component registry for AI applications, used by 2M developers (370K 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.

Products

  • 21st.dev

    Developer Tools & PlatformsFrom $6/month

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    Community registry for browsing, copying, and installing 10,000+ React and Tailwind CSS components and templates via AI-ready prompts or shadcn CLI.

  • 21st AI

    Developer Tools & PlatformsFrom $15/month

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    Multi-model AI generation and refinement tool for UI, including Sketch (multi-model comparison), Code mode (React + live sandbox), and refine & iterate on a take.

Security and compliance

As reported by 21st. Ask for audit reports before you buy.

  • SOC 2In progress
  • Encryption in transit (TLS 1.2 or higher)
  • Encryption at rest on supported subprocessors
  • Multi-factor authentication on internal accounts with production access
  • Role-based access controls with regular access reviews
  • Background checks for personnel handling production data
  • Continuous vulnerability monitoring of codebase and dependencies

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