21st is an open-source library of React components and UI blocks built on shadcn/ui, Tailwind CSS, and Radix UI. It functions as a curated repository for developers to discover and integrate production-ready UI elements into Next.js applications.

Key Capabilities#

• Provides a collection of copy-paste components that extend the standard shadcn/ui library with multi-part layouts and interactive elements.
• Enables rapid prototyping through pre-configured blocks including hero sections, pricing tables, and navigation menus.
• Supports deep customization via Tailwind CSS utility classes and Framer Motion for motion-based animations.
• Implements accessible design patterns by strictly following WAI-ARIA standards through Radix UI primitives.

Technical Context#

• Optimized for Next.js 14+ and React 18, leveraging Server Components and the App Router architecture.
• Requires Tailwind CSS and the shadcn/ui CLI for local dependency management and styling.

Use Cases#

• Building high-conversion SaaS landing pages with responsive, pre-designed UI patterns.
• Developing internal dashboards that require consistent design systems and complex data visualizations.

Browse the component library to copy source code directly into your local project directory.