Authorizer vs ZITADEL
A side-by-side comparison of two self-hosted identity & sso options — licensing, setup difficulty, resource needs, and what each one replaces.
ZITADEL
Cloud-native identity infrastructure with multi-tenancy built
| Feature | Authorizer | ZITADEL |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 85 · Excellent | 95 · Excellent |
| Category | Identity & SSO | Identity & SSO |
| License | Apache-2.0 | Apache-2.0 |
| Language | Go | Go |
| Setup difficulty | Easy | Medium |
| Min. RAM | 256 MB | 512 MB |
| Deployment | docker, binary | docker, kubernetes, binary |
| GitHub stars | ★ 2,007 | ★ 15,083 |
| First released | 2021 | 2020 |
| Replaces | Auth0, Firebase Authentication | Auth0, Okta, Firebase Auth |
What are Authorizer and ZITADEL?
Authorizer
Authorizer is a self-hosted authentication and authorization service that provides social login, email and OTP login, and roles through a GraphQL API. It ships with prebuilt login pages and SDKs.
- Social and email login
- GraphQL auth API
- Prebuilt login UI
- Role-based access control
ZITADEL
ZITADEL is an open-source identity and access management platform built for multi-tenant applications. It offers OpenID Connect, OAuth2, SAML, passwordless login and a powerful management API.
- Multi-tenancy as a first-class concept
- Passwordless and FIDO2 authentication
- Event-sourced audit trail
- Comprehensive gRPC and REST APIs
Authorizer vs ZITADEL: key differences
Both projects are written in Go. Authorizer is the lighter option, starting around 256 MB of RAM against 512 MB for ZITADEL. ZITADEL has the considerably larger community, at 15,083 GitHub stars versus 2,007.
Why pick each one
Choose Authorizer if…
- Released under the Apache-2.0 license
- Easy to set up — beginner-friendly
- First-class Docker support for quick deployment
- Active community (2k GitHub stars)
Choose ZITADEL if…
- Strong multi-tenant model
- Modern Go codebase
Watch out for
- Smaller community than Keycloak
Frequently asked questions
Is Authorizer or ZITADEL better?
Neither is universally better. ZITADEL has the larger community, while Authorizer is simpler to set up (easy difficulty). Choose based on the comparison table above and your own setup.
Are Authorizer and ZITADEL free and open-source?
Yes. Authorizer is licensed under Apache-2.0 and ZITADEL under Apache-2.0. Both can be self-hosted at no software cost.
Can I run Authorizer and ZITADEL with Docker?
Authorizer: yes. ZITADEL: yes.
Which is lighter on resources, Authorizer or ZITADEL?
Authorizer has the smaller minimum footprint at 256 MB of RAM, compared to about 512 MB for ZITADEL. Real-world usage depends on library size, user count, and enabled features.