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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
1Zitadel logoZitadelOpen sourceYesWeb, Self-hosted4 of 459.6
2Authgear logoAuthgearOpen sourceYesWeb, Self-hosted, iOS +14 of 457.2
3SuperTokens logoSuperTokensOpen sourceYesWeb, Self-hosted4 of 455.3
  1. Zitadel logo

    1. ZitadelTop pick

    Best for: B2B SaaS teams that want multi-tenant identity with the option to self-host

    Open sourceSelf-hostableWeb, Self-hosted

    59.6

    score / 100

    Why switch from FusionAuth

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

    Pros

    • Multi-tenancy and delegated admin built into the core
    • Choice of managed cloud or self-hosting the same code
    • Full audit trail from its event-sourced design

    Cons

    • AGPL licence may need legal review for some companies
    • Smaller community than Keycloak
    • Free cloud tier is limited in daily active users
    Visit Zitadel 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 Zitadel a good FusionAuth alternative?

    Verified facts

    4 of 4 verified
    License
    AGPL-3.0
    Checked Oct 25, 2026github.com(opens source in a new tab)
    Free plan
    $0/month cloud tier
    Checked Oct 25, 2026zitadel.com(opens source in a new tab)
    Pro price
    $100/month
    Checked Oct 25, 2026zitadel.com(opens source in a new tab)
    Data location
    EU, US, Switzerland or Australia
    Checked Oct 25, 2026zitadel.com(opens source in a new tab)
  2. Authgear logo

    2. Authgear

    Best for: Consumer and mobile apps that want passkeys and WhatsApp OTP without per-user fees

    Open sourceSelf-hostableWeb, Self-hosted, iOS, Android

    57.2

    score / 100

    Why switch from FusionAuth

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

    Pros

    • Unlimited MAU on the free and developer cloud plans
    • WhatsApp and SMS OTP alongside passkeys and biometrics
    • Open source with cloud, VPC or on-premises deployment

    Cons

    • Smaller ecosystem and community
    • Free plan has short log retention and few messages
    • Less focus on B2B features like SCIM
    Visit Authgear 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 Authgear 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)
    Free plan
    $0/month with unlimited MAU
    Checked Oct 25, 2026authgear.com(opens source in a new tab)
    Developers plan
    $50/month
    Checked Oct 25, 2026authgear.com(opens source in a new tab)
    Self-hosting
    Cloud, your VPC or own hardware
    Checked Oct 25, 2026authgear.com(opens source in a new tab)
  3. SuperTokens logo

    3. SuperTokens

    Best for: Developers who want self-hostable auth with prebuilt UI and code-level control

    Open sourceSelf-hostableWeb, Self-hosted

    55.3

    score / 100

    Why switch from FusionAuth

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

    Pros

    • Self-hosted open-source features are free without user limits
    • Prebuilt login UI plus overrides for every step
    • Simple per-user pricing on the managed cloud

    Cons

    • Back-end SDKs cover fewer languages than larger rivals
    • Some features like MFA are paid add-ons even when self-hosted
    • You run the core service yourself when self-hosting
    Visit SuperTokens Details and reviews
    How this score is calculated
    Editorial fit ×0.363
    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 SuperTokens a good FusionAuth alternative?

    Verified facts

    4 of 4 verified
    Self-hosting
    Free, no user limits
    Checked Oct 25, 2026supertokens.com(opens source in a new tab)
    Cloud price
    $0.02 per MAU
    Checked Oct 25, 2026supertokens.com(opens source in a new tab)
    Cloud free tier
    Under 5,000 MAU
    Checked Oct 25, 2026supertokens.com(opens source in a new tab)
    Backing
    Y Combinator
    Checked Oct 25, 2026supertokens.com(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.