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CasdoorOry Kratos
Free

Free and open source.

 Free

Free to self-host; Ory also sells a hosted version through Ory Network.

Web, Self-hosted Self-hosted
  • Supports OAuth, OIDC, SAML, CAS, LDAP and SCIM
  • Several MFA options including WebAuthn and TOTP
  • Supports passkeys, social sign-in, OIDC, SAML and TOTP
  • API-first design leaves the login UI fully under your control
  • Needs to be hosted and secured by you
  • Wide feature scope, including AI agent features, adds complexity
  • Headless, so you must build or adopt your own login pages
  • Aimed at developers rather than end users
Self-hosted Self-hosted
Open source Open source
License: Apache-2.0 License not stated
No account needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked September 23, 2026

Checked October 1, 2026

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