FusionAuth vs Open Policy Agent
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?
FusionAuth
Complete authentication and authorization platform
VS
Open Policy Agent
General-purpose policy engine for cloud-native stacks
| Feature | FusionAuth | Open Policy Agent |
|---|---|---|
| Category | Identity & SSO | Identity & SSO |
| License | Apache-2.0 | Apache-2.0 |
| Language | Dockerfile | Go |
| Setup difficulty | Medium | Medium |
| Min. RAM | 1,024 MB | 256 MB |
| Deployment | docker, kubernetes, bare-metal | docker, kubernetes, binary |
| GitHub stars | ★ 241 | ★ 12,086 |
| First released | 2018 | 2016 |
| Replaces | Auth0, Okta | AWS IAM policies |
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 Open Policy Agent if…
- Released under the Apache-2.0 license
- First-class Docker support for quick deployment
- Kubernetes-ready with Helm charts available
- Mature project with 12.1k GitHub stars
Frequently asked questions
Is FusionAuth or Open Policy Agent better?
Neither is universally better. Open Policy Agent has the larger community; both share a medium setup difficulty, so the decision comes down to features and licensing.
Are FusionAuth and Open Policy Agent free and open-source?
Yes. FusionAuth is licensed under Apache-2.0 and Open Policy Agent under Apache-2.0. Both can be self-hosted at no software cost.
Can I run FusionAuth and Open Policy Agent with Docker?
FusionAuth: yes. Open Policy Agent: yes.