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Keycloak vs Zitadel: catalog facts
Keycloak	Zitadel
Free Free and open source under the Apache 2.0 licence.	Freemium Open source for self-hosting, with a hosted service that has a free starting plan and paid…
Self-hosted	Web, Self-hosted
Single sign-on and single sign-out across applications Supports OpenID Connect and SAML 2.0 identity brokering	Self-hostable, with deployment documentation Built-in MFA, passwordless and social login
Setting it up and securing it takes real administrative effort More than most single-user homelabs need	Aimed at developers integrating identity into applications Running it yourself means operating an identity service
Self-hosted	Self-hosted, Hosted service
Open source	Open source
License: Apache-2.0	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.