The best open source alternative to FusionAuth is Keycloak. If that doesn't suit you, our users have ranked more than 50 alternatives to FusionAuth and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to FusionAuth are authentik, AuthKit, Hanko and Stack Auth.
Open Source Identity and Access Management for modern Applications and Services.
Keycloak is the most popular Linux & Self-Hosted alternative to FusionAuth.
Keycloak is the most popular Open Source & free alternative to FusionAuth.
authentik is an open-source identity provider focused on flexibility and versatility.
authentik is the most popular Mac alternative to FusionAuth.
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.
AuthKit is the most popular Web-based alternative to FusionAuth.
Hanko is a modern open source Authentication & User Management system – built and hosted in the EU. Alternative to Clerk, Auth0, Stytch, Descope.
Hanko is the most popular SaaS alternative to FusionAuth.
Stack is an open-source, self-hostable, and highly customizable authentication and user management system.
Kanidm is an identity management server, acting as an authority on account information, authentication and authorisation within a technical environment.
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.
Nubus is a modular open-source solution for centralized identity & access management, providing secure user management, role-based access control, and Single Sign-On (SSO) via a central web portal.
Rauthy is a lightweight and easy to use Identity Provider supporting OpenID Connect, OAuth 2.0 and PAM. It aims to be simple to both set up and operate, with very secure defaults and lots of config options, if you need the flexibility.
The Gluu Server is a container distribution of free open source software (FOSS) for identity and access management (IAM). SaaS, custom, open source and commercial web and mobile applications can leverage a Gluu Server for user authentication, identity information, and policy...
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