Ory Hydra 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 | Ory Hydra | ZITADEL |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 90 · Excellent | 95 · Excellent |
| Category | Identity & SSO | Identity & SSO |
| License | Apache-2.0 | Apache-2.0 |
| Language | Go | Go |
| Setup difficulty | Hard | Medium |
| Min. RAM | 256 MB | 512 MB |
| Deployment | docker, kubernetes, binary | docker, kubernetes, binary |
| GitHub stars | ★ 17,563 | ★ 15,083 |
| First released | 2015 | 2020 |
| Replaces | Okta, Auth0 | Auth0, Okta, Firebase Auth |
What are Ory Hydra and ZITADEL?
Ory Hydra
Ory Hydra is an OpenID Certified OAuth 2.0 and OpenID Connect provider. It is built to integrate with any existing identity system and issues tokens without managing user accounts itself.
- OpenID Certified implementation
- Low memory footprint
- Bring your own login and consent UI
- Scales horizontally
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
Ory Hydra vs ZITADEL: key differences
Both projects are written in Go. Ory Hydra is the lighter option, starting around 256 MB of RAM against 512 MB for ZITADEL. Ory Hydra is the more established project (first released 2015), while ZITADEL arrived in 2020.
Why pick each one
Choose Ory Hydra if…
- Security focused and certified
- Integrates with any user store
Watch out for
- Only handles OAuth, not user management
Choose ZITADEL if…
- Strong multi-tenant model
- Modern Go codebase
Watch out for
- Smaller community than Keycloak
Frequently asked questions
Is Ory Hydra or ZITADEL better?
Neither is universally better. Ory Hydra has the larger community, while ZITADEL is simpler to set up (medium difficulty). Choose based on the comparison table above and your own setup.
Are Ory Hydra and ZITADEL free and open-source?
Yes. Ory Hydra is licensed under Apache-2.0 and ZITADEL under Apache-2.0. Both can be self-hosted at no software cost.
Can I run Ory Hydra and ZITADEL with Docker?
Ory Hydra: yes. ZITADEL: yes.
Which is lighter on resources, Ory Hydra or ZITADEL?
Ory Hydra 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.