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Keycloak alternatives: 6 apps ranked by verified data

Facts checked Oct 25, 2026AppBreakup editorialHow we rank

Common reasons people leave Keycloak: you run, scale and upgrade it yourself, and admin concepts and theming have a steep learning curve. We ranked 6 alternatives by how directly each one replaces Keycloak, then by reviews, real visits and how recently each app's facts were checked against its own website. Zitadel currently ranks first.

Quick comparison

#AppPricingOpen sourcePlatformsVerified factsScore
1FusionAuth logoFusionAuthFree plan + paidNoWeb, Self-hosted, Linux +23 of 359.6
  1. FusionAuth logo

    1. FusionAuthTop pick

    Best for: Teams that want a full-featured identity server they can self-host for free

    Free plan + paidSelf-hostableWeb, Self-hosted, Linux, macOS, Windows

    59.6

    score / 100

    Why switch from Keycloak

    Self-hostable server with a cleaner API and optional paid support and hosting.

    Pros

    • Free self-hosted Community edition with unlimited users
    • Complete REST API and client libraries
    • Same product whether self-hosted or cloud

    Cons

    • 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
    Visit FusionAuth Details and reviews
    How this score is calculated
    Editorial fit ×0.377
    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 FusionAuth a good Keycloak alternative?

    Verified facts

    3 of 3 verified
    Free plan
    Community edition, unlimited users
    Checked Oct 25, 2026fusionauth.io(opens source in a new tab)
    Self-hosting
    Yes, free
    Checked Oct 25, 2026fusionauth.io(opens source in a new tab)
    Starting price
    Starter from $162/month, billed annually
    Checked Oct 25, 2026fusionauth.io(opens source in a new tab)

The best Keycloak alternative for…

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

Zitadel logo

Best Keycloak alternative for most people

Zitadel

Modern open-source alternative with a friendlier UI and a managed cloud if you want it.

authentik logo

Best Keycloak alternative for a free option

authentik

Easier to configure, with a built-in application proxy, LDAP and RADIUS.

FusionAuth logo

Best Keycloak alternative for a free plan you can upgrade

FusionAuth

Self-hostable server with a cleaner API and optional paid support and hosting.

Ory logo

Best Keycloak alternative for open source

Ory

Headless, API-first components for teams that want to build their own login UI.

Casdoor logo

Best Keycloak alternative for self-hosting

Casdoor

Lightweight open-source IAM with a simple web UI and many identity providers.

FusionAuth logo

Best Keycloak alternative for Mac

FusionAuth

Self-hostable server with a cleaner API and optional paid support and hosting.

FusionAuth logo

Best Keycloak alternative for Windows

FusionAuth

Self-hostable server with a cleaner API and optional paid support and hosting.

FusionAuth logo

Best Keycloak alternative for Linux

FusionAuth

Self-hostable server with a cleaner API and optional paid support and hosting.

Auth0 logo

Best Keycloak alternative for working in the browser

Auth0

Fully managed, so nobody on the team has to run identity servers.

Keycloak alternatives: common questions

What is the best alternative to Keycloak?

Zitadel ranks first right now. Modern open-source alternative with a friendlier UI and a managed cloud if you want it. authentik and FusionAuth follow it in our ranking.

Is there a free alternative to Keycloak?

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

Is there an open-source alternative to Keycloak?

Yes: Zitadel, authentik, Ory and Casdoor. Zitadel, authentik and Ory can also be self-hosted.

Which Keycloak alternatives work on Linux?

FusionAuth runs on Linux.

Why do people switch from Keycloak?

The complaints we hear most: you run, scale and upgrade it yourself; admin concepts and theming have a steep learning curve; login pages look dated without custom themes.

How is this list ranked?

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