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authentik vs Zitadel: catalog facts
authentik	Zitadel
Free The software is free under its open-source licence. Hosting, hardware and external…	Freemium Open source for self-hosting, with a hosted service that has a free starting plan and paid…
Linux, Self-hosted, Web	Web, Self-hosted
One server covers SAML, OAuth2/OIDC, LDAP and RADIUS, with a flow builder that lets you compose the login…	Self-hostable, with deployment documentation Built-in MFA, passwordless and social login
The flow model is powerful but confusing at first, and some organisation-scale features sit in a paid enterprise…	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: MIT	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 22, 2026	Official website Full listing and sources Checked September 23, 2026

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