Clerk

Clerk is a complete authentication and user management solution designed for modern web applications. It provides robust API and UI components to handle user sign up, sign in, multi-tenancy, organization management, and enterprise-level authentication, including SSO and role-based access control. Clerk is ideal for developers needing a secure, scalable, and easy-to-integrate auth layer with rich features such as agent authentication, multi-organization support, and billing integrations.