Gluu Flex vs Keycloak
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?
Gluu Flex
Enterprise identity and access management platform
VS
Keycloak
Open-source identity and access management for modern apps
| Feature | Gluu Flex | Keycloak |
|---|---|---|
| Category | Identity & SSO | Identity & SSO |
| License | Apache-2.0 | Apache-2.0 |
| Language | TypeScript | Java |
| Setup difficulty | Hard | Hard |
| Min. RAM | 4,096 MB | 1,024 MB |
| Deployment | docker, kubernetes, helm | docker, kubernetes, bare-metal |
| GitHub stars | ★ 31 | ★ 36,058 |
| First released | 2009 | 2014 |
| Replaces | Okta, Ping Identity | Okta, Auth0, Microsoft Entra ID |
Why pick each one
Choose Gluu Flex if…
- Released under the Apache-2.0 license
- First-class Docker support for quick deployment
- Kubernetes-ready with Helm charts available
- Written in TypeScript
Frequently asked questions
Is Gluu Flex or Keycloak better?
Neither is universally better. Keycloak has the larger community; both share a hard setup difficulty, so the decision comes down to features and licensing.
Are Gluu Flex and Keycloak free and open-source?
Yes. Gluu Flex is licensed under Apache-2.0 and Keycloak under Apache-2.0. Both can be self-hosted at no software cost.
Can I run Gluu Flex and Keycloak with Docker?
Gluu Flex: yes. Keycloak: yes.