Zitadel
Open-source · self-hostable · replaces 1 SaaS tool on os-alt
zitadel/zitadel · alive · ★ 13.8k · last commit 1d ago · 1021 open issues
License: Apache-2.0
Good fit for Multi-tenant SaaS that wants per-tenant orgs as a first-class concept.
Weak at Younger ecosystem; fewer tutorial articles than Keycloak.
In a terminal? npx -y github:SolvoHQ/os-alt-cli auth0 prints
the Auth0 comparison table including Zitadel.
how the CLI works →
Replaces these SaaS
- Auth0 · Identity / SSO / authentication-as-a-service
Zitadel ships a Go-based migration tool that consumes Auth0's user export. Run `zitadel-tools migrate auth0 --tenant <yours>` against the export; users + bcrypt hashes import. Action scripts in Auth0 map to Zitadel Actions (JS via Goja runtime).
README badges for the SaaS this replaces
Maintainers and forks: drop a badge in your README to link readers from the SaaS-comparison page back to your repo.
FAQ
Is Zitadel actively maintained?
Yes — last commit 1d ago. The repository is alive (commit activity within the past 90 days).
What does Zitadel cost to self-host?
Zitadel is free and open source under Apache-2.0. Typical self-host VPS cost: $10-15 VPS — Go binary + CockroachDB or Postgres.
Which SaaS does Zitadel replace?
Zitadel is listed as an open-source self-host alternative to: Auth0.