Apereo CAS vs Rauthy
A side-by-side comparison of two self-hosted identity & sso options — licensing, setup difficulty, resource needs, and what each one replaces.
Not the right match-up?
Apereo CAS
Enterprise single sign-on server for web applications
VS
Rauthy
Lightweight OpenID Connect provider written in Rust
| Feature | Apereo CAS | Rauthy |
|---|---|---|
| Category | Identity & SSO | Identity & SSO |
| License | Apache-2.0 | Apache-2.0 |
| Language | Java | Rust |
| Setup difficulty | Hard | Medium |
| Min. RAM | 1,024 MB | 128 MB |
| Deployment | docker, kubernetes, bare-metal | docker, binary |
| GitHub stars | ★ 11,354 | ★ 1,256 |
| First released | 2004 | 2023 |
| Replaces | Okta, Ping Identity | Keycloak, Auth0 |
Why pick each one
Choose Apereo CAS if…
- Mature SSO with broad protocol support
- Widely adopted in academia
Choose Rauthy if…
- Released under the Apache-2.0 license
- First-class Docker support for quick deployment
- Active community (1.3k GitHub stars)
- Written in Rust
Frequently asked questions
Is Apereo CAS or Rauthy better?
Neither is universally better. Apereo CAS has the larger community, while Rauthy is simpler to set up (medium difficulty). Choose based on the comparison table above and your own setup.
Are Apereo CAS and Rauthy free and open-source?
Yes. Apereo CAS is licensed under Apache-2.0 and Rauthy under Apache-2.0. Both can be self-hosted at no software cost.
Can I run Apereo CAS and Rauthy with Docker?
Apereo CAS: yes. Rauthy: yes.