21st.dev — Component Marketplace for shadcn/ui-Based React Libraries

Introduction

21st.dev is an open-source marketplace that aggregates shadcn/ui-compatible React components from community authors. It provides a searchable registry where developers discover, preview, and install Tailwind-styled components directly into their projects using the shadcn CLI.

What 21st.dev Does

• Aggregates thousands of shadcn/ui-compatible components from community contributors
• Provides live previews of each component with code inspection
• Generates shadcn CLI-compatible install commands for one-line setup
• Categorizes components by type: buttons, cards, forms, navigation, charts, and more
• Supports component versioning and dependency resolution

Architecture Overview

The platform indexes component registries published by authors following the shadcn/ui component specification. Each component includes metadata, dependencies, and source code served through a compatible registry API. The frontend provides search, filtering, and interactive previews rendered in isolated sandboxes.

Setup & Configuration

• No installation required for browsing; use the web interface to discover components
• Install components via npx shadcn@latest add with the 21st.dev registry URL
• Authors publish components by creating a registry following shadcn/ui conventions
• Configure your project's components.json to accept third-party registries
• Preview components in different themes (light/dark) before installing

Key Features

• Largest open collection of shadcn/ui-compatible components and blocks
• One-command installation that respects your project's Tailwind config
• Interactive preview playground for testing component behavior
• Author profiles with component collections and usage statistics
• Hooks library alongside visual components for shared logic patterns

Comparison with Similar Tools

• shadcn/ui — the official component set; 21st.dev extends it with community contributions
• Aceternity UI — provides animated components; 21st.dev aggregates from multiple such libraries
• Magic UI — single-author animated components; 21st.dev is a multi-author marketplace
• npm — general package registry; 21st.dev is curated specifically for copy-paste UI components
• Storybook — documents your own components; 21st.dev discovers external ones

FAQ

Q: Are components free to use? A: Yes. All components on 21st.dev are open source and free for commercial use.

Q: How do I publish my own components? A: Create a shadcn/ui-compatible registry repository and submit it for indexing on the platform.

Q: Do components work with other frameworks like Vue or Svelte? A: The marketplace focuses on React components; Vue and Svelte ecosystems have separate registries.

Q: How are component quality and security ensured? A: Components are community-reviewed, and the platform scans for known vulnerabilities in dependencies.

Sources

• https://github.com/serafimcloud/21st
• https://21st.dev