Why do teams look for Keycloak alternatives?

Rarely price, since Keycloak is free. Usually operational burden: running it in production means owning high availability, database tuning, upgrade paths across major versions, theming and realm design, and that is a standing engineering commitment rather than a one-off setup. The second reason is that major-version upgrades have historically required real migration work. The third is fit, since Keycloak was designed around enterprise realms and classic federation, and teams building B2B SaaS multi-tenancy or developer-first flows sometimes find they are working against the grain.

Which alternative has the best licence terms?

Keycloak itself has among the best: Apache 2.0 with no commercial feature gating. Ory is the closest comparable position, with Kratos, Hydra, Keto, Oathkeeper and Polis all Apache 2.0 and no relicensing event. The nuance is feature gating rather than licence gating: some Ory capabilities, including B2B organisations and multi-tenancy in Kratos, ship only in Ory Enterprise License binaries distributed from a private registry. So the licence is fully open and the open-source build is not the same product as the commercial one.

What is the closest self-hosted alternative to Keycloak?

Zitadel and Authentik are the two most often shortlisted, both offering self-hosted identity with modern interfaces and more contemporary defaults than Keycloak. Ory is the pick if you want composable components you can adopt individually, such as running Hydra purely as a certified OAuth 2.0 and OIDC provider without taking a whole platform. FusionAuth is the option if you want self-hosted with straightforward commercial licensing and support rather than pure community support.

Should I move to a managed service instead?

If your objection is the operational burden rather than the cost or the licence, then yes, and swapping one self-hosted project for another will not solve it. Auth0 and WorkOS both remove the operating burden entirely and add what self-hosted projects typically lack: an SLA, published compliance certifications and support you can escalate to. The trade is per-user cost that grows with you, and a dependency you cannot patch yourself. Be honest about which problem you actually have before shortlisting.

What about authentication libraries rather than a platform?

Different category, and worth knowing before you compare them directly. Better Auth is now the strongest open-source authentication library for TypeScript, with 2FA, passkeys, organisations, SAML through its SSO plugin and inbound SCIM, all MIT licensed. Vercel acquired it in July 2026 and the library remains MIT. But a library is not an identity provider: there is no SLA, no published SOC 2 or ISO 27001, and you own the deployment. It replaces Keycloak only if Keycloak was doing application login rather than acting as a central IdP.

Is Keycloak actually free?

Yes, genuinely. Apache 2.0, no paid tier, no feature gating, no user caps. Red Hat build of Keycloak exists as a supported commercial distribution if you want someone to call, but the upstream project is complete rather than crippled. That is a stronger position than several products marketed as open-source alternatives, where the enterprise directory of the repository carries a separate licence requiring a subscription for production use. When comparing, read the LICENSE files rather than the marketing page.

What do I lose by leaving Keycloak?

Protocol breadth and community depth, mostly. Keycloak covers OIDC, OAuth 2.0, SAML 2.0, user federation against LDAP and Active Directory, identity brokering and fine-grained authorization services in one package, and very few alternatives match all of that without paid tiers. You also lose a large body of existing tutorials, Stack Overflow answers and operator knowledge. Check specifically for SAML support and LDAP federation, which are the two capabilities most often thinner in the newer alternatives.

Tools

Keycloak Alternatives: 7 Options Compared

Keycloak is free and capable, and running it well is a real job. Seven alternatives compared on licence, operational burden and what you give up by leaving self-hosted identity.

By SWI Community TeamUpdated 2026-09-2010 min read

Key takeaways

Keycloak is Apache 2.0 with no commercial feature gating, which is a stronger licence position than most alternatives marketed as open source.
Check where the licence stops before comparing: several alternatives keep an open core with proprietary enterprise directories, and the boundary sits in different places.
Ory is the closest genuinely open-licensed alternative, with every component Apache 2.0, though certain capabilities ship only in its commercial binaries.
If the objection is operational burden rather than cost, a managed service is the honest answer, and a different open-source project will not help.

Keycloak is free, Apache 2.0, and covers OIDC, OAuth 2.0, SAML, LDAP and Active Directory federation, identity brokering and authorization services in a single package. Very few alternatives match that without a paid tier.

So the question is almost never cost. It is whether you want to keep running it.

Name the actual objection first

Operational burden. Running Keycloak in production means owning high availability, database tuning, major-version upgrades, realm design and theming. That is a standing engineering commitment. If this is your objection, another self-hosted project will not fix it, and you should be looking at managed services.

Fit. Keycloak was built around enterprise realms and classic federation. Teams building B2B SaaS multi-tenancy or developer-first flows sometimes find themselves working against its grain rather than with it.

Licence. This one is rarely the reason to leave Keycloak, because its terms are better than most of what gets recommended as an alternative. Worth saying plainly: several products marketed as open-source Keycloak alternatives keep an enterprise directory under a separate licence requiring a paid subscription for production use. Read the LICENSE files, not the landing page.

If you want genuinely open components: Ory

Ory is the closest licence position to Keycloak, with Kratos, Hydra, Keto, Oathkeeper and Polis all Apache 2.0 and no relicensing event. Each runs standalone, so you can adopt Hydra purely as a certified OAuth 2.0 and OIDC provider without taking a platform. The caveat is feature gating rather than licence gating: B2B organisations and multi-tenancy in Kratos ship only in commercial binaries.

If you want self-hosted with a modern interface

Zitadel and Authentik are the usual shortlist, both self-hostable with more contemporary defaults. FusionAuth suits teams wanting self-hosted with straightforward commercial licensing and real support. Compare Keycloak vs Zitadel and FusionAuth vs Keycloak.

If you want to stop operating identity

Auth0 and WorkOS remove the burden and add what self-hosted projects structurally lack: an SLA, published compliance certifications, and someone accountable. You pay per user and take a dependency you cannot patch yourself.

Better Auth is now the strongest open-source TypeScript authentication library, MIT licensed, covering 2FA, passkeys, organisations, SAML and inbound SCIM. Vercel acquired it in July 2026 and the library stays MIT. It replaces Keycloak only if Keycloak was doing application login rather than acting as a central identity provider.

Before you migrate

Check SAML support and LDAP federation specifically, since those are the two capabilities most often thinner in newer alternatives. See top 10 open-source IAM solutions and top 8 open-source CIAM platforms for the wider field.

Frequently asked questions

Why do teams look for Keycloak alternatives?: Rarely price, since Keycloak is free. Usually operational burden: running it in production means owning high availability, database tuning, upgrade paths across major versions, theming and realm design, and that is a standing engineering commitment rather than a one-off setup. The second reason is that major-version upgrades have historically required real migration work. The third is fit, since Keycloak was designed around enterprise realms and classic federation, and teams building B2B SaaS multi-tenancy or developer-first flows sometimes find they are working against the grain.
Which alternative has the best licence terms?: Keycloak itself has among the best: Apache 2.0 with no commercial feature gating. Ory is the closest comparable position, with Kratos, Hydra, Keto, Oathkeeper and Polis all Apache 2.0 and no relicensing event. The nuance is feature gating rather than licence gating: some Ory capabilities, including B2B organisations and multi-tenancy in Kratos, ship only in Ory Enterprise License binaries distributed from a private registry. So the licence is fully open and the open-source build is not the same product as the commercial one.
What is the closest self-hosted alternative to Keycloak?: Zitadel and Authentik are the two most often shortlisted, both offering self-hosted identity with modern interfaces and more contemporary defaults than Keycloak. Ory is the pick if you want composable components you can adopt individually, such as running Hydra purely as a certified OAuth 2.0 and OIDC provider without taking a whole platform. FusionAuth is the option if you want self-hosted with straightforward commercial licensing and support rather than pure community support.
Should I move to a managed service instead?: If your objection is the operational burden rather than the cost or the licence, then yes, and swapping one self-hosted project for another will not solve it. Auth0 and WorkOS both remove the operating burden entirely and add what self-hosted projects typically lack: an SLA, published compliance certifications and support you can escalate to. The trade is per-user cost that grows with you, and a dependency you cannot patch yourself. Be honest about which problem you actually have before shortlisting.
What about authentication libraries rather than a platform?: Different category, and worth knowing before you compare them directly. Better Auth is now the strongest open-source authentication library for TypeScript, with 2FA, passkeys, organisations, SAML through its SSO plugin and inbound SCIM, all MIT licensed. Vercel acquired it in July 2026 and the library remains MIT. But a library is not an identity provider: there is no SLA, no published SOC 2 or ISO 27001, and you own the deployment. It replaces Keycloak only if Keycloak was doing application login rather than acting as a central IdP.
Is Keycloak actually free?: Yes, genuinely. Apache 2.0, no paid tier, no feature gating, no user caps. Red Hat build of Keycloak exists as a supported commercial distribution if you want someone to call, but the upstream project is complete rather than crippled. That is a stronger position than several products marketed as open-source alternatives, where the enterprise directory of the repository carries a separate licence requiring a subscription for production use. When comparing, read the LICENSE files rather than the marketing page.
What do I lose by leaving Keycloak?: Protocol breadth and community depth, mostly. Keycloak covers OIDC, OAuth 2.0, SAML 2.0, user federation against LDAP and Active Directory, identity brokering and fine-grained authorization services in one package, and very few alternatives match all of that without paid tiers. You also lose a large body of existing tutorials, Stack Overflow answers and operator knowledge. Check specifically for SAML support and LDAP federation, which are the two capabilities most often thinner in the newer alternatives.

Last reviewed September 20, 2026By SWI Community TeamSuggest a correction How we research

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