FusionAuth vs Janssen Project
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
Janssen Project
Cloud-native identity and access management platform
| Feature | FusionAuth | Janssen Project |
|---|---|---|
| Deploy effort | Under-an-hour setup | Read-the-docs project |
| Health score | 70 · Good | 80 · Excellent |
| Category | Identity & SSO | Identity & SSO |
| License | Apache-2.0 | Apache-2.0 |
| Language | Dockerfile | Java |
| Setup difficulty | Medium | Hard |
| Min. RAM | 1,024 MB | 4,096 MB |
| Deployment | docker, kubernetes, bare-metal | kubernetes, helm |
| GitHub stars | ★ 241 | ★ 649 |
| First released | 2018 | 2020 |
| Replaces | Auth0, Okta | Okta, Auth0 |
What are FusionAuth and Janssen Project?
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
Janssen Project
The Janssen Project is a Linux Foundation effort delivering a scalable, cloud-native identity and access management platform. It implements OpenID Connect, OAuth 2.0, and FIDO standards for authentication and authorization.
- OpenID Connect provider
- OAuth 2.0 server
- FIDO2 and passkeys
- Cloud-native deployment
FusionAuth vs Janssen Project: key differences
FusionAuth is written in Dockerfile, while Janssen Project is built with Java. FusionAuth is the lighter option, starting around 1,024 MB of RAM against 4,096 MB for Janssen Project. FusionAuth is the more established project (first released 2018), while Janssen Project arrived in 2020. Janssen Project has the considerably larger community, at 649 GitHub stars versus 241. FusionAuth lists first-class Docker deployment; Janssen Project does not.
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 Janssen Project if…
- Standards complete
- Built for scale
Watch out for
- Complex to operate
- Heavy resource needs
Frequently asked questions
Is FusionAuth or Janssen Project better?
Neither is universally better. Janssen Project 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 Janssen Project free and open-source?
Yes. FusionAuth is licensed under Apache-2.0 and Janssen Project under Apache-2.0. Both can be self-hosted at no software cost.
Can I run FusionAuth and Janssen Project with Docker?
FusionAuth: yes. Janssen Project: check the project docs for container support.
Which is lighter on resources, FusionAuth or Janssen Project?
FusionAuth has the smaller minimum footprint at 1,024 MB of RAM, compared to about 4,096 MB for Janssen Project. Real-world usage depends on library size, user count, and enabled features.