FusionAuth vs ZITADEL
A side-by-side comparison of two self-hosted identity & sso options — licensing, setup difficulty, resource needs, and what each one replaces.
FusionAuth
Complete authentication and authorization platform
VS
ZITADEL
Cloud-native identity infrastructure with multi-tenancy built
| Feature | FusionAuth | ZITADEL |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 70 · Good | 95 · Excellent |
| Category | Identity & SSO | Identity & SSO |
| License | Apache-2.0 | Apache-2.0 |
| Language | Dockerfile | Go |
| Setup difficulty | Medium | Medium |
| Min. RAM | 1,024 MB | 512 MB |
| Deployment | docker, kubernetes, bare-metal | docker, kubernetes, binary |
| GitHub stars | ★ 241 | ★ 15,083 |
| First released | 2018 | 2020 |
| Replaces | Auth0, Okta | Auth0, Okta, Firebase Auth |
What are FusionAuth and ZITADEL?
FusionAuth
FusionAuth is a self-hostable customer identity and access management platform supporting OAuth, OIDC, SAML, MFA, and user management. The community edition runs free on your own infrastructure.
- OAuth, OIDC and SAML support
- Multi-factor authentication
- User and tenant management
- Themable login pages
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
FusionAuth vs ZITADEL: key differences
FusionAuth is written in Dockerfile, while ZITADEL is built with Go. ZITADEL is the lighter option, starting around 512 MB of RAM against 1,024 MB for FusionAuth. FusionAuth is the more established project (first released 2018), while ZITADEL arrived in 2020. ZITADEL has the considerably larger community, at 15,083 GitHub stars versus 241.
Why pick each one
Choose FusionAuth if…
- Released under the Apache-2.0 license
- First-class Docker support for quick deployment
- Kubernetes-ready with Helm charts available
- Written in Dockerfile
Choose ZITADEL if…
- Strong multi-tenant model
- Modern Go codebase
Watch out for
- Smaller community than Keycloak
Frequently asked questions
Is FusionAuth or ZITADEL better?
Neither is universally better. ZITADEL has the larger community; both share a medium setup difficulty, so the decision comes down to features and licensing.
Are FusionAuth and ZITADEL free and open-source?
Yes. FusionAuth is licensed under Apache-2.0 and ZITADEL under Apache-2.0. Both can be self-hosted at no software cost.
Can I run FusionAuth and ZITADEL with Docker?
FusionAuth: yes. ZITADEL: yes.
Which is lighter on resources, FusionAuth or ZITADEL?
ZITADEL has the smaller minimum footprint at 512 MB of RAM, compared to about 1,024 MB for FusionAuth. Real-world usage depends on library size, user count, and enabled features.