21st

12,000+ hand-crafted React and Tailwind CSS components, templates, and shadcn themes with AI-ready prompts.

Overview

21st is a community-driven registry of UI components, templates, and themes built by design engineers. It hosts over 12,000 hand-crafted React and Tailwind CSS components alongside full production-ready templates and shadcn themes. Rather than functioning as a traditional component library, 21st lets you copy code directly into your repository and customize it freely.

The platform is designed for AI-first workflows. Every component ships as an AI-ready prompt that you can paste into tools like Cursor, Claude Code, v0, or Lovable, where an AI agent will rebuild and integrate it into your codebase. You can also use the classic shadcn CLI install method if preferred. Components are published in shadcn registry format and compose with shadcn/ui primitives.

21st is used by over 4 million builders, from indie makers to teams at Google, Meta, NVIDIA, Shopify, and PayPal. The platform is free to browse, with a free daily allowance of component copies, optional paid membership for unlimited access, and add-on AI credits for generation and refinement features.

Key features

12,000+ hand-crafted React components
2,000+ marketing blocks and hero sections
Full production-ready templates
shadcn/ui themes and compatibility
AI-ready prompts for Cursor, Claude Code, v0, Lovable
Live preview and one-command installation
Community-authored with author attribution
Bookmarking and team collections
Design Bug Bot for PR reviews
SVG logo search and shader/gradient tools

Pros

Massive curated collection from real design engineers
AI-first workflow with prompt-based installation
Code copied into repo (not a dependency) — full ownership
Works seamlessly with shadcn/ui and Tailwind
Free browsing and 2 free daily copies
Used by major companies and 4M+ builders
Community-driven with 700+ contributing designers
Templates include exact feature lists before purchase

Cons

Free tier limited to 2 component copies per day
Paid plans required for unlimited access and AI features
Requires AI tool integration for prompt-based workflow
No version management since code is copied, not imported
Learning curve for new users unfamiliar with shadcn/ui

Use this if

You're building React apps with Tailwind CSS and want quick access to production-ready components; you use AI coding assistants and want prompt-based UI generation; you need full code ownership without dependency management; you're part of a team needing shared design resources.

Skip this if

You prefer traditional npm-installed component libraries with version control; you don't use React or Tailwind CSS; you need components for non-web platforms; you want a single cohesive design system rather than multi-author styles.

Best for

React developers building with Tailwind CSSTeams using AI coding assistantsDesigners and engineers shipping UI quicklyProjects using shadcn/uiStartups and agencies needing production-ready templates