Gluu Flex vs Kanidm
A side-by-side comparison of two self-hosted identity & sso options — licensing, setup difficulty, resource needs, and what each one replaces.
Kanidm
Modern, simple and secure identity management server
| Feature | Gluu Flex | Kanidm |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 69 · Good | 90 · Excellent |
| Category | Identity & SSO | Identity & SSO |
| License | Apache-2.0 | MPL-2.0 |
| Language | TypeScript | Rust |
| Setup difficulty | Hard | Medium |
| Min. RAM | 4,096 MB | 256 MB |
| Deployment | docker, kubernetes, helm | docker, binary |
| GitHub stars | ★ 31 | ★ 5,404 |
| First released | 2009 | 2019 |
| Replaces | Okta, Ping Identity | Active Directory, Okta |
What are Gluu Flex and Kanidm?
Gluu Flex
Gluu provides a self-hostable identity platform for single sign-on, multi-factor authentication, and access management built on open standards. It supports OAuth, OIDC, SAML, and FIDO2.
- Single sign-on
- OAuth, OIDC and SAML
- FIDO2 strong authentication
- Kubernetes deployment
Kanidm
Kanidm is an identity management platform written in Rust, focused on simplicity, security and correctness. It provides authentication for web applications, Unix systems and LDAP-aware services.
- OAuth2 and OpenID Connect provider
- Passkey-first authentication
- Unix and LDAP integration
- Strong security defaults
Gluu Flex vs Kanidm: key differences
Gluu Flex is written in TypeScript, while Kanidm is built with Rust. Licensing differs — Apache-2.0 for Gluu Flex versus MPL-2.0 for Kanidm. Kanidm is the lighter option, starting around 256 MB of RAM against 4,096 MB for Gluu Flex. Gluu Flex is the more established project (first released 2009), while Kanidm arrived in 2019. Kanidm has the considerably larger community, at 5,404 GitHub stars versus 31.
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
Choose Kanidm if…
- Memory safe and lightweight
- Excellent passwordless support
Watch out for
- Smaller ecosystem and tooling
Frequently asked questions
Is Gluu Flex or Kanidm better?
Kanidm is the stronger all-round pick: it has both the larger community and the simpler medium setup. Consider Gluu Flex if its specific feature set fits your needs better.
Are Gluu Flex and Kanidm free and open-source?
Yes. Gluu Flex is licensed under Apache-2.0 and Kanidm under MPL-2.0. Both can be self-hosted at no software cost.
Can I run Gluu Flex and Kanidm with Docker?
Gluu Flex: yes. Kanidm: yes.
Which is lighter on resources, Gluu Flex or Kanidm?
Kanidm has the smaller minimum footprint at 256 MB of RAM, compared to about 4,096 MB for Gluu Flex. Real-world usage depends on library size, user count, and enabled features.