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FusionAuth alternatives: 5 apps ranked by verified data

Facts checked Oct 25, 2026AppBreakup editorialHow we rank

Common reasons people leave FusionAuth: not open source; premium features need a paid licence, and managed hosting plans get expensive quickly. We ranked 5 alternatives by how directly each one replaces FusionAuth, then by reviews, real visits and how recently each app's facts were checked against its own website. Keycloak currently ranks first.

Quick comparison

#AppPricingOpen sourcePlatformsVerified factsScore
1Keycloak logoKeycloakOpen sourceYesSelf-hosted, Linux, macOS +14 of 466.5
  1. Keycloak logo

    1. KeycloakTop pick

    Best for: Organisations that want standards-based SSO on their own infrastructure at no licence cost

    Open sourceSelf-hostableSelf-hosted, Linux, macOS, Windows

    66.5

    score / 100

    Why switch from FusionAuth

    Fully open source and free, with no premium tier gating features.

    Pros

    • Free and open source under Apache 2.0
    • Supports OIDC, OAuth 2.0 and SAML with LDAP and AD federation
    • Mature, widely deployed and well understood

    Cons

    • You run, scale and upgrade it yourself
    • Admin concepts and theming have a steep learning curve
    • Login pages look dated without custom themes
    Visit Keycloak Details and reviews
    How this score is calculated
    Editorial fit ×0.3100
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Keycloak a good FusionAuth alternative?

    Verified facts

    4 of 4 verified
    License
    Apache-2.0
    Checked Oct 25, 2026github.com(opens source in a new tab)
    Protocols
    OpenID Connect, OAuth 2.0, SAML
    Checked Oct 25, 2026keycloak.org(opens source in a new tab)
    Directory federation
    LDAP and Active Directory
    Checked Oct 25, 2026keycloak.org(opens source in a new tab)
    Deployment
    Container image for Docker, Podman, Kubernetes
    Checked Oct 25, 2026keycloak.org(opens source in a new tab)

The best FusionAuth alternative for…

The highest-ranked app in this list for each need.

Keycloak logo

Best FusionAuth alternative for most people

Keycloak

Fully open source and free, with no premium tier gating features.

Zitadel logo

Best FusionAuth alternative for a free option

Zitadel

Open-source alternative with a built-in multi-tenant model and a cheaper cloud plan.

Auth0 logo

Best FusionAuth alternative for a free plan you can upgrade

Auth0

Fully managed with a large free tier if you would rather not run servers.

Authgear logo

Best FusionAuth alternative for open source

Authgear

Open-source and self-hostable with unlimited users on its free cloud plan.

SuperTokens logo

Best FusionAuth alternative for self-hosting

SuperTokens

Open-source core you can self-host without limits, with simple per-user cloud pricing.

Keycloak logo

Best FusionAuth alternative for Mac

Keycloak

Fully open source and free, with no premium tier gating features.

Keycloak logo

Best FusionAuth alternative for Windows

Keycloak

Fully open source and free, with no premium tier gating features.

Keycloak logo

Best FusionAuth alternative for Linux

Keycloak

Fully open source and free, with no premium tier gating features.

Authgear logo

Best FusionAuth alternative for iPhone and Android

Authgear

Open-source and self-hostable with unlimited users on its free cloud plan.

Auth0 logo

Best FusionAuth alternative for working in the browser

Auth0

Fully managed with a large free tier if you would rather not run servers.

FusionAuth alternatives: common questions

What is the best alternative to FusionAuth?

Keycloak ranks first right now. Fully open source and free, with no premium tier gating features. Auth0 and Zitadel follow it in our ranking.

Is there a free alternative to FusionAuth?

Yes. Keycloak (open source), Auth0 (free plan + paid), Zitadel (open source) and Authgear (open source) have a free option. Check each app's verified facts for current plan limits.

Is there an open-source alternative to FusionAuth?

Yes: Keycloak, Zitadel, Authgear and SuperTokens. Keycloak, Zitadel and Authgear can also be self-hosted.

Which FusionAuth alternatives work on Linux?

Keycloak runs on Linux.

Why do people switch from FusionAuth?

The complaints we hear most: not open source; premium features need a paid licence; managed hosting plans get expensive quickly; you run, upgrade and secure it yourself when self-hosting.

How is this list ranked?

Every app is scored with the same published formula: how directly it replaces FusionAuth, reviews (weighted by verification), visits from AppBreakup, how recently its facts were checked against its own website, and reader votes.