Authorizer vs FusionAuth
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
| Feature | Authorizer | FusionAuth |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 85 · Excellent | 70 · Good |
| Category | Identity & SSO | Identity & SSO |
| License | Apache-2.0 | Apache-2.0 |
| Language | Go | Dockerfile |
| Setup difficulty | Easy | Medium |
| Min. RAM | 256 MB | 1,024 MB |
| Deployment | docker, binary | docker, kubernetes, bare-metal |
| GitHub stars | ★ 2,007 | ★ 241 |
| First released | 2021 | 2018 |
| Replaces | Auth0, Firebase Authentication | Auth0, Okta |
What are Authorizer and FusionAuth?
Authorizer
Authorizer is a self-hosted authentication and authorization service that provides social login, email and OTP login, and roles through a GraphQL API. It ships with prebuilt login pages and SDKs.
- Social and email login
- GraphQL auth API
- Prebuilt login UI
- Role-based access control
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
Authorizer vs FusionAuth: key differences
Authorizer is written in Go, while FusionAuth is built with Dockerfile. Authorizer is the lighter option, starting around 256 MB of RAM against 1,024 MB for FusionAuth. FusionAuth is the more established project (first released 2018), while Authorizer arrived in 2021. Authorizer has the considerably larger community, at 2,007 GitHub stars versus 241.
Why pick each one
Choose Authorizer if…
- Released under the Apache-2.0 license
- Easy to set up — beginner-friendly
- First-class Docker support for quick deployment
- Active community (2k GitHub stars)
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
Frequently asked questions
Is Authorizer or FusionAuth better?
Authorizer is the stronger all-round pick: it has both the larger community and the simpler easy setup. Consider FusionAuth if its specific feature set fits your needs better.
Are Authorizer and FusionAuth free and open-source?
Yes. Authorizer is licensed under Apache-2.0 and FusionAuth under Apache-2.0. Both can be self-hosted at no software cost.
Can I run Authorizer and FusionAuth with Docker?
Authorizer: yes. FusionAuth: yes.
Which is lighter on resources, Authorizer or FusionAuth?
Authorizer 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.