FusionAuth vs Ory Hydra
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
Ory Hydra
Certified OAuth 2.0 and OpenID Connect server
| Feature | FusionAuth | Ory Hydra |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 70 · Good | 90 · Excellent |
| Category | Identity & SSO | Identity & SSO |
| License | Apache-2.0 | Apache-2.0 |
| Language | Dockerfile | Go |
| Setup difficulty | Medium | Hard |
| Min. RAM | 1,024 MB | 256 MB |
| Deployment | docker, kubernetes, bare-metal | docker, kubernetes, binary |
| GitHub stars | ★ 241 | ★ 17,563 |
| First released | 2018 | 2015 |
| Replaces | Auth0, Okta | Okta, Auth0 |
What are FusionAuth and Ory Hydra?
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
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
FusionAuth vs Ory Hydra: key differences
FusionAuth is written in Dockerfile, while Ory Hydra is built with Go. Ory Hydra is the lighter option, starting around 256 MB of RAM against 1,024 MB for FusionAuth. Ory Hydra is the more established project (first released 2015), while FusionAuth arrived in 2018. Ory Hydra has the considerably larger community, at 17,563 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 Ory Hydra if…
- Security focused and certified
- Integrates with any user store
Watch out for
- Only handles OAuth, not user management
Frequently asked questions
Is FusionAuth or Ory Hydra better?
Neither is universally better. Ory Hydra has the larger community, while FusionAuth is simpler to set up (medium difficulty). Choose based on the comparison table above and your own setup.
Are FusionAuth and Ory Hydra free and open-source?
Yes. FusionAuth is licensed under Apache-2.0 and Ory Hydra under Apache-2.0. Both can be self-hosted at no software cost.
Can I run FusionAuth and Ory Hydra with Docker?
FusionAuth: yes. Ory Hydra: yes.
Which is lighter on resources, FusionAuth or Ory Hydra?
Ory Hydra has the smaller minimum footprint at 256 MB of RAM, compared to about 1,024 MB for FusionAuth. Real-world usage depends on library size, user count, and enabled features.