Keycloak alternatives
Open-source identity broker with SSO, OIDC, SAML, and user federation for enterprises.
Keycloak compared with its alternatives on free plan, learning curve and setup time
 KeycloakThis toolOpen-source identity broker with SSO, OIDC, SAML, and user federation for enterprises. | Yes | Medium | 30 minutes to 2 hours depending on deployment method |
 Auth0Identity platform for authentication, authorization, SSO, and social login in apps. | — | Medium | 5 minutes |
 Auth.jsOpen-source authentication library for Next.js and modern JavaScript frameworks. | Yes | Easy | 5-10 minutes |
 Better AuthTypeScript authentication framework with plugins for sessions, OAuth, and passkeys. | Yes | Medium | Quick setup with CLI initialization |
 ClerkComprehensive authentication and user management platform designed for modern web applications. | Yes | Easy | 5-10 minutes |
 JWTJSON Web Token standard for compact, signed claims used in stateless API authentication. | Yes | Easy | — |
 WorkOSModern API platform that enables developers to quickly add enterprise features to their applications. | Yes | Easy | Minutes for basic SSO integration |
| — | — | — | |
| Yes | Easy | — | |
 BuilderBoxBuilder Box helps developers launch full-stack SaaS apps faster with ready-to-use auth, payments, and AI tools. | No | Medium | 15-30 minutes |
 GravityGravity helps you launch a SaaS fast with auth, payments, and dashboards ready. | Yes | Medium | Minutes with setup wizard; full SaaS running in hours |
| Yes | Easy | Minutes to get started | |
| Yes | Medium | Under 5 minutes to get started; MVP deployable in days |
How these alternatives were chosen
Tools Keycloak names as alternatives that this directory also publishes, followed by others in Auth. The order is not a ranking, and "—" means we have not checked that field — not that the answer is no.
Keycloak also lists Okta, Azure AD, Cognito, FusionAuth, Authentik as alternatives. Those are not in this directory yet, so there is nothing to compare — and nothing to link to.