Zitadel Has a Free API — Heres How to Build Multi-Tenant Auth in Minutes

Zitadel is an open-source identity platform with multi-tenancy built in. Perfect for SaaS — each customer gets their own organization with separate users, roles, and branding. Why Zitadel? Multi-tenant by default : Each org has isolated users OIDC/OAuth2/SAML : Industry standards Passwordless : WebAuthn, passkeys Actions : Custom logic on auth events (like Auth0 Actions) Self-hosted or cloud : Both options gRPC + REST : Both API styles Free tier : 25K MAUs on cloud Self-Host docker run -p 8080:8080 \ ghcr.io/zitadel/zitadel:latest start-from-init \ --masterkey "MasterkeyNeedsToHave32Characters" \ --tlsMode disabled Console at http://localhost:8080 API: Create Organization curl -X POST http://localhost:8080/management/v1/orgs \ -H 'Authorization: Bearer ACCESS_TOKEN' \ -H 'Content-Type: application/json' \ -d '{"name": "Acme Corp"}' API: Create User curl -X POST http://localhost:8080/management/v1/users/human/_import \ -H 'Authorization: Bearer ACCESS_TOKEN' \ -H 'Content-Type: applicat