WSO2 Identity Server 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 | WSO2 Identity Server | ZITADEL |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 80 · Excellent | 95 · Excellent |
| Category | Identity & SSO | Identity & SSO |
| License | Apache-2.0 | Apache-2.0 |
| Language | Java | Go |
| Setup difficulty | Hard | Medium |
| Min. RAM | 4,096 MB | 512 MB |
| Deployment | docker, kubernetes, bare-metal | docker, kubernetes, binary |
| GitHub stars | ★ 880 | ★ 15,083 |
| First released | 2007 | 2020 |
| Replaces | Okta, ForgeRock | Auth0, Okta, Firebase Auth |
What are WSO2 Identity Server and ZITADEL?
WSO2 Identity Server
WSO2 Identity Server is an open-source IAM product that provides single sign-on, identity federation, and strong authentication. It supports SAML, OpenID Connect, and adaptive authentication policies.
- Single sign-on
- Identity federation
- Adaptive authentication
- Standards support
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
WSO2 Identity Server vs ZITADEL: key differences
WSO2 Identity Server is written in Java, while ZITADEL is built with Go. ZITADEL is the lighter option, starting around 512 MB of RAM against 4,096 MB for WSO2 Identity Server. WSO2 Identity Server is the more established project (first released 2007), while ZITADEL arrived in 2020. ZITADEL has the considerably larger community, at 15,083 GitHub stars versus 880.
Why pick each one
Choose WSO2 Identity Server if…
- Enterprise feature set
- Strong standards coverage
Watch out for
- Resource heavy
- Complex tuning
Choose ZITADEL if…
- Strong multi-tenant model
- Modern Go codebase
Watch out for
- Smaller community than Keycloak
Frequently asked questions
Is WSO2 Identity Server or ZITADEL better?
ZITADEL is the stronger all-round pick: it has both the larger community and the simpler medium setup. Consider WSO2 Identity Server if its specific feature set fits your needs better.
Are WSO2 Identity Server and ZITADEL free and open-source?
Yes. WSO2 Identity Server is licensed under Apache-2.0 and ZITADEL under Apache-2.0. Both can be self-hosted at no software cost.
Can I run WSO2 Identity Server and ZITADEL with Docker?
WSO2 Identity Server: yes. ZITADEL: yes.
Which is lighter on resources, WSO2 Identity Server or ZITADEL?
ZITADEL has the smaller minimum footprint at 512 MB of RAM, compared to about 4,096 MB for WSO2 Identity Server. Real-world usage depends on library size, user count, and enabled features.