Clerk adds secure authentication and user management to your React or Next.js app

🔒 Essential security features like 2 factor auth and device management

📈 Conversion-optimized Sign Up and Sign In forms

🎨 Built-in theming and open APIs for easy customization

Clerk gives you more than just a "sign-in box". You get a complete set of User Management UIs and APIs, including a powerful Admin Dashboard. Purpose-built for React, Next.js, and the Modern Web. Finally, an auth service that "just works".

Speed up your application with sub-millisecond authentication, mitigate hackers with active device management and revocation, and much more.