Clerk.

About Clerk

Clerk is a full-stack authentication and user-management platform for web and mobile applications. It provides prebuilt UI components, SDKs, APIs, and hosted account experiences that help developers add sign-up, sign-in, user profiles, sessions, and security settings without implementing every identity flow from scratch. Clerk supports a range of authentication strategies, including email and phone verification codes, passwords, social sign-on, enterprise single sign-on, passkeys, multi-factor authentication, magic links, and other configurable options. Teams can use hosted Account Portal pages, embed customizable components directly into application routes, or build custom flows with Clerk’s APIs when they need more control over the interface and logic. The platform includes components such as SignIn, SignUp, UserButton, UserProfile, and organization controls. These components handle common account interactions while allowing teams to customize appearance, branding, layouts, and supported authentication methods. Clerk’s SDKs and server-side helpers can also be used to protect routes, read sessions, manage users, and authorize requests to application backends. For SaaS and business applications, Clerk Organizations provides multi-tenant building blocks for teams, memberships, invitations, roles, organization switching, and access-aware user experiences. Developers can use organization components and APIs to represent customers or workspaces and to control access to shared resources. Clerk also offers user-management features for profiles, connected accounts, contact information, metadata, sessions, and security settings. Additional platform capabilities can support billing, waitlists, bot protection, authorization checks, database integrations, and enterprise identity workflows, depending on the selected plan and configuration. Clerk is a strong fit for product teams that want a managed identity layer with polished user interfaces, framework integrations, and support for both consumer and multi-tenant business applications. It can reduce the amount of security-sensitive account code a team must maintain while still providing options for custom flows and application-specific authorization. Pricing and feature availability vary by plan, so teams should review Clerk’s current documentation and pricing before adopting it for production.