Open Source Self-Hosted Keycloak Alternatives

There are many alternatives to Keycloak as a self-hosted solution if you are looking for a replacement. The best open source Self-Hosted alternative is authentik. If that doesn't suit you, our users have ranked more than 50 alternatives to Keycloak and many of them are open source and available as a self-hosted solution so hopefully you can find a suitable replacement. Other interesting open source Self-Hosted alternatives to Keycloak are VoidAuth, ZITADEL , Authelia and Hanko.

filter to find the best alternatives

Keycloak alternatives are mainly Identity Management Tools, but if you're looking for Linux Distros or Reverse Proxy Servers you can filter on that. Other popular filters include Open Source and Self-Hosted + Open Source. You can also filter by region, for example EU-based alternatives if you prefer software developed in the European Union. These are just examples - use the filter bar below to find more specific alternatives to Keycloak.
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Alternatives list

  2. VoidAuth icon

    VoidAuth

     5 likes

    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.

    27 VoidAuth alternatives

    Cost / License

    Application type

    Platforms

    • Self-Hosted
    • Docker
    VoidAuth screenshot 1
     
  4. ZITADEL icon

    ZITADEL

     20 likes

    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.

    Cost / License

    Application type

    Platforms

    • Online
    • Self-Hosted
    • Software as a Service (SaaS)
    ZITADEL screenshot 1
     
  5. Authelia icon

    Authelia

     13 likes

    Protect your applications with Single Sign-On and 2 Factor. Authelia is an open-source full-featured authentication server available on Github.

    20 Authelia alternatives

    Cost / License

    Application type

    Platforms

    • Self-Hosted
    • Kubernetes
    • Docker
    Authelia screenshot 1
     
  6. Hanko icon

    Hanko

     12 likes

    Hanko is a modern open source Authentication & User Management system – built and hosted in the EU. Alternative to Clerk, Auth0, Stytch, Descope.

    31 Hanko alternatives

    Cost / License

    • Freemium
    • Open Source

    Application type

    Platforms

    • Self-Hosted
    • Software as a Service (SaaS)
    Hanko screenshot 1
     
    |
    1
    Comments about Hanko as an Alternative to Keycloak
    SebL
    Positive
    0

    Open source, simple component-based integrations, and passkeys - what's not to like?

    Review by a new / low-activity user.
    Hanko icon
    Hanko icon
    • Hanko is Freemium and Open SourceKeycloak is Free and Open Source
    • Hanko is Privacy focusedKeycloak is not according to our users
  7. AuthKit icon

    AuthKit

     9 likes

    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.

    Cost / License

    • Freemium
    • Open Source (MIT)

    Platforms

    • Online
    • Self-Hosted
    AuthKit screenshot 1
     
  9. Stack Auth icon

    Stack Auth

     11 likes

    Stack is an open-source, self-hostable, and highly customizable authentication and user management system.

    30 Stack Auth alternatives

    Cost / License

    • Freemium
    • Open Source

    Application type

    Platforms

    • Online
    • Self-Hosted
    • Software as a Service (SaaS)
    Stack Auth screenshot 1
     
    |
    1
    Comments about Stack Auth as an Alternative to Keycloak
    Guest
    Negative
    0

    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

    Review by a new / low-activity user.
    Stack Auth icon
    Stack Auth icon
    • Stack Auth is Freemium and Open SourceKeycloak is Free and Open Source
    • Stack Auth is Privacy focusedKeycloak is not according to our users
  10. Kanidm icon

    Kanidm

     1 like

    Kanidm is an identity management server, acting as an authority on account information, authentication and authorisation within a technical environment.

    Cost / License

    Application type

    Platforms

    • Docker
    • Self-Hosted
    Kanidm screenshot 1
     
  11. LemonLDAP::NG icon

    LemonLDAP::NG

     16 likes

    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.

    19 LemonLDAP::NG alternatives

    Cost / License

    Application type

    Platforms

    • Windows
    • Linux
    • Self-Hosted
    LemonLDAP::NG screenshot 1
     
  12. Pomerium icon

    Pomerium

     6 likes

    Pomerium is an identity and context-aware proxy that enables secure access to applications without a client. Pomerium provides a standardized interface to add access control to applications regardless of whether the application itself has authorization or authentication baked-in.

    15 Pomerium alternatives

    Cost / License

    Application type

    Platforms

    • Linux
    • Self-Hosted
    • Kubernetes
    • Docker
    Pomerium screenshot 1
     
  13. Authorizer (authentication) icon

    Authorizer (authentication)

     5 likes

    Your data, your control. Fully open source, authentication and authorization. No lock-ins. Deployment in Railway.app | Heroku in 120 seconds || Spin a docker image as a micro-service in your infra. Built in login page and Admin panel out of the box.

    Cost / License

    • Free
    • Open Source (MIT)

    Application type

    Platforms

    • Self-Hosted
    Authorizer (authentication) screenshot 1
     
  14. Logto icon

    Logto

     7 likes

    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.

    55 Logto alternatives

    Cost / License

    Application type

    Platforms

    • Self-Hosted
    Configure sign-in and sign-up method
     
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