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