Authentication & Identity
Hosted identity platforms, open-source identity servers, and authentication libraries for sign-in, SSO, and user management.
8 tools
Auth0
Identity platform for login, SSO, and MFA in customer-facing apps
authentik
Self-hosted identity provider with SSO, MFA, and an application proxy
Better Auth
Framework-agnostic authentication library for TypeScript
Clerk
Hosted authentication and user management with prebuilt UI components
Firebase Authentication
Drop-in user sign-in for web and mobile apps from Google Firebase
Keycloak
Open-source identity and access management with SSO, OAuth 2.0, and OIDC
WorkOS
APIs for enterprise SSO, directory sync, and user management
Zitadel
Open-source identity platform for multi-tenant B2B apps, cloud or self-hosted
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