Clerk
Authentication and user management for applications.
Clerk is an authentication and user management platform for web and mobile applications. It provides prebuilt sign-up, sign-in, and user profile UI components, along with session management, multifactor authentication, social sign-on, machine authentication through API keys and M2M tokens, B2B organization management, and subscription billing. It also supports SSO connections and directory sync, and offers SDKs for frameworks such as Next.js, React, Expo, React Router, TanStack React Start, and Astro.
Key capabilities include drop-in UI components for authentication, profile management, organization management, and billing; session lifecycle management with device monitoring and revocation; bot detection; email and SMS one-time passcodes; magic links; password authentication with breach detection; custom roles and permissions; invitations; auto-join by verified email domain; and integrations with tools such as Supabase, Convex, and Vercel. Clerk is SOC 2 Type 2 and HIPAA certified, and complies with GDPR through the EU-U.S. Data Privacy Framework.
Clerk is packaged with a free Hobby plan that includes unlimited applications and a monthly retained user limit per app, with no credit card required. Paid Pro and Business plans add features such as SSO connections, directory sync, MFA, custom session lifetimes, enhanced dashboard roles, and priority support. An Enterprise tier is available with annual billing, uptime SLAs, premium support, custom log retention, and HIPAA compliance with a BAA. Add-ons cover enhanced B2B authentication, administration, and subscription billing, with usage-based pricing for retained users, organizations, SMS, and billing volume.
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