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Auth0 alternatives: 7 apps ranked by verified data

Facts checked Oct 25, 2026AppBreakup editorialHow we rank

Common reasons people leave Auth0: costs rise sharply once you need B2B or enterprise features, and cloud only for most customers; no self-hosted edition. We ranked 7 alternatives by how directly each one replaces Auth0, then by reviews, real visits and how recently each app's facts were checked against its own website. Clerk currently ranks first.

Quick comparison

#AppPricingOpen sourcePlatformsVerified factsScore
1Keycloak logoKeycloakOpen sourceYesSelf-hosted, Linux, macOS +14 of 459.6
2FusionAuth logoFusionAuthFree plan + paidNoWeb, Self-hosted, Linux +23 of 357.2
  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

    59.6

    score / 100

    Why switch from Auth0

    Free, self-hosted and standards-based, for teams that would rather run identity themselves.

    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 ×0.377
    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 Keycloak a good Auth0 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)
  2. FusionAuth logo

    2. FusionAuth

    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

    57.2

    score / 100

    Why switch from Auth0

    Similar feature set with a free self-hosted Community edition and no per-user cloud lock-in.

    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 ×0.369
    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 Auth0 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 Auth0 alternative for…

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

Cl

Best Auth0 alternative for most people

Clerk

Faster to drop into React and Next.js apps, with prebuilt UI components and a larger free tier.

Keycloak logo

Best Auth0 alternative for a free option

Keycloak

Free, self-hosted and standards-based, for teams that would rather run identity themselves.

WorkOS logo

Best Auth0 alternative for a free plan you can upgrade

WorkOS

Better fit for B2B SaaS that mainly needs enterprise SSO and SCIM, with a free first million users.

Zitadel logo

Best Auth0 alternative for open source

Zitadel

Open-source alternative with cloud or self-hosting and multi-tenancy built in.

FusionAuth logo

Best Auth0 alternative for self-hosting

FusionAuth

Similar feature set with a free self-hosted Community edition and no per-user cloud lock-in.

Keycloak logo

Best Auth0 alternative for Mac

Keycloak

Free, self-hosted and standards-based, for teams that would rather run identity themselves.

Keycloak logo

Best Auth0 alternative for Windows

Keycloak

Free, self-hosted and standards-based, for teams that would rather run identity themselves.

Keycloak logo

Best Auth0 alternative for Linux

Keycloak

Free, self-hosted and standards-based, for teams that would rather run identity themselves.

Amazon Cognito logo

Best Auth0 alternative for iPhone and Android

Amazon Cognito

Cheaper per user for teams already on AWS, at the cost of a rougher developer experience.

Firebase logo

Best Auth0 alternative for working in the browser

Firebase

Simpler and cheaper for mobile and web apps already using Firebase services.

Auth0 alternatives: common questions

What is the best alternative to Auth0?

Clerk ranks first right now. Faster to drop into React and Next.js apps, with prebuilt UI components and a larger free tier. WorkOS and Keycloak follow it in our ranking.

Is there a free alternative to Auth0?

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

Is there an open-source alternative to Auth0?

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

Which Auth0 alternatives work on Linux?

Keycloak and FusionAuth run on Linux.

Why do people switch from Auth0?

The complaints we hear most: costs rise sharply once you need B2B or enterprise features; cloud only for most customers; no self-hosted edition; dashboard and docs can be confusing alongside Okta's own products.

How is this list ranked?

Every app is scored with the same published formula: how directly it replaces Auth0, reviews (weighted by verification), visits from AppBreakup, how recently its facts were checked against its own website, and reader votes.