The best open source alternative to Keycloak is VoidAuth. If that doesn't suit you, our users have ranked more than 50 alternatives to Keycloak and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Keycloak are authentik, Authelia, ZITADEL and Hanko.
Open-source authentication and user management platform offering passkey-based SSO, centralized login, user invitations, self-registration, and email integration for self-hosted deployments. Emphasizes privacy, admin and user ease, local data control, and strong security.
authentik is an open-source identity provider focused on flexibility and versatility.
Protect your applications with Single Sign-On and 2 Factor. Authelia is an open-source full-featured authentication server available on Github.
Secure authentication management for your application. Customize as you grow, with easy APIs and programmable workflows. Focus on growing, your login is in good hands.
Hanko is a modern open source Authentication & User Management system – built and hosted in the EU. Alternative to Clerk, Auth0, Stytch, Descope.
AuthKit is a Radix-powered open source authentication UI built for effortless customizations. User Management is the backend platform handling email verification, account linking, bot blocking, organization modeling, and more.
Stack is an open-source, self-hostable, and highly customizable authentication and user management system.
Stack Auth is not an OpenID or Oauth provider. It is a web backend for a set of libraries for authentication, but it does not do OpenID or Oauth
Better Auth is a framework-agnostic authentication and authorization framework for TypeScript. It provides a comprehensive set of features out of the box and includes a plugin ecosystem that simplifies adding advanced functionalities.
Kanidm is an identity management server, acting as an authority on account information, authentication and authorisation within a technical environment.
Phase Two builds on top of Keycloak, one of the most widely used open source identity and access management systems in the world. Our extensions bring multi-tenancy, audit logging, a self-service admin portal, and more to enhance Keycloak for SaaS and on-premise use cases.
LemonlLDAP::NG is a modular Web-SSO based on Apache::Session modules. It simplifies the build of a protected area with a few changes in the application. It manages both authentication and authorization and provides headers for accounting.
Logto helps you build the sign-in, auth, and user identity within minutes. We provide an OIDC-based identity service and the end-user experience with username, phone number, email, and social sign-in, for web and native apps.
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Open source, simple component-based integrations, and passkeys - what's not to like?