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Zitadel — open source alternative

Cloud-native identity platform built in Go with event sourcing.

Strengths

  • Multi-tenant from day one — good for B2B SaaS builders.
  • Event-sourced audit trail for compliance.
  • Swiss hosted option if you prefer managed.

Weaknesses

  • Younger than Keycloak — integration guides are thinner.
  • Operational model differs from traditional IAM.
  • Advanced features (actions, custom flows) still maturing.
License: Apache-2.0 Self-host difficulty: 3/5 Hosted cloud option

Official site · Source on GitHub

Ad slot — OSS middle

Zitadel is used as an alternative to

Okta

Enterprise identity, SSO and MFA cloud.

See all alternatives →

More open source in this category

Discover other projects tagged Identity & SSO on the category page.

Other open source projects in Identity & SSO

Keycloak

Enterprise-grade identity and access management from Red Hat.

License: Apache-2.0

Authentik

Modern identity provider with a polished admin UI.

License: MIT

Authelia

Single sign-on portal designed for reverse proxies.

License: Apache-2.0

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