Welcome to 21st

Canvas: AI-powered prototyping

21st is an AI-powered prototyping tool for frontend development. Build prototypes with AI, explore multiple variations side by side, and copy production-ready code into your project. Your core loop:

Describe what you want in chat — from small tweaks to new features
Let AI generate multiple prototypes to compare
Pick your favorite and copy the code into your project

Community: components for Canvas and AI agents

On top of Canvas, 21st includes a Community library of open-source React/Tailwind components, real app screens, and themes that you can use inside Canvas or with any AI coding assistant (Cursor, Claude Code, Lovable, etc.).

Copy components and drop them into your repo via Canvas or your editor
Use component links and prompts directly in Canvas chat as building blocks
Paste prompts into AI coding assistants like Cursor, Claude Code, Lovable, or others to generate variations in their environments

Who is 21st for?

Frontend engineers — Prototype and iterate on UI faster with an AI coding agent.
Designers — Turn ideas, references, and screenshots into high-fidelity React components.
Product teams & founders — Prototype, compare approaches, and collect feedback before writing production code.

What makes 21st different?

Multiple prototypes at once — Generate several variations and compare them visually.
Works on your real codebase — Optionally connect GitHub to prototype with your components.
Community of real components — Not just screenshots: installable, remixable React code.
AI that understands context — Combines your repo, components library, and inspiration screens.