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21st

Freemium

AI-powered UI builder and community library of React components

21st is an AI-powered UI builder and community library for React and Tailwind CSS. It combines Magic Chat — an AI coding assistant that generates production-ready components from natural language — with a curated community registry of open-source components, real app screens, and themes. With 2 million developers using the platform, 21st also offers an Agents SDK to deploy frontier AI agents with built-in UI, tools, memory, and observability.

react componentstailwind cssai ui buildercomponent librarymagic chatagent sdkfrontendCode GenerationTask ExecutionCode RefactoringgenerationeditingCode AssistantAI Agents

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What is it

21st is an AI-powered UI builder and community library for React and Tailwind CSS, combining Magic Chat for AI component generation with a curated registry of open-source components and an Agents SDK for deploying AI agents.

What it can do

Generate production-ready React/Tailwind components from natural language, browse and copy thousands of community components, recreate websites from URLs, and deploy frontier AI agents with built-in infrastructure.

Who is it for

Frontend developers, product teams, and companies building AI-powered applications who need rapid UI prototyping and component discovery.

Key Features

Magic Chat – AI Component Generation

AI coding assistant that generates production-ready React/Tailwind components from natural language descriptions. Describe what you want, iterate with follow-up messages, and copy the code directly into your project.

Magic MCP – IDE Integration

Use 21st components directly from your IDE via the Model Context Protocol (MCP). Your agent automatically finds relevant UI examples and patterns before writing code.

Community Library – Open-Source Components

Browse and use thousands of production-ready React/Tailwind components, real app screens from companies like Stripe and Linear, and color themes. All components are MIT-licensed and free to use.

Site Clone – Design Replication

Recreate any website's design from a URL. Upload a reference site and get a working React/Tailwind implementation. Pro feature.

Use Cases

Rapid UI Prototyping

Product teams and solo developers use Magic Chat to generate landing pages, dashboards, and interface elements from natural language, cutting design-to-code time from hours to minutes.

AI-Powered Application Development

Teams building AI apps use the Agents SDK to deploy Claude Code, Codex, and other frontier agents inside their products with one command.

Component Discovery and Reuse

Frontend developers browse the community library to find production-ready React components, copy code directly, or install via shadcn CLI for immediate use in projects.