Kanidm vs OpenLDAP
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
VS
OpenLDAP
The classic open-source Lightweight Directory Access Protocol server
| Feature | Kanidm | OpenLDAP |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Category | Identity & SSO | Identity & SSO |
| License | MPL-2.0 | OLDAP-2.8 |
| Language | Rust | C |
| Setup difficulty | Medium | Hard |
| Min. RAM | 256 MB | 128 MB |
| Deployment | docker, binary | docker, bare-metal, source |
| GitHub stars | ★ 5,404 | ★ 400 |
| First released | 2019 | 1998 |
| Replaces | Active Directory, Okta | Active Directory |
What are Kanidm and OpenLDAP?
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
OpenLDAP
OpenLDAP is a free, open-source implementation of the Lightweight Directory Access Protocol. It is widely used as a directory backend for authentication, address books and centralized user management.
- Industry-standard LDAP directory
- High performance and scalability
- Replication and clustering support
- Extensible schema system
Kanidm vs OpenLDAP: key differences
Kanidm is written in Rust, while OpenLDAP is built with C. Licensing differs — MPL-2.0 for Kanidm versus OLDAP-2.8 for OpenLDAP. OpenLDAP is the lighter option, starting around 128 MB of RAM against 256 MB for Kanidm. OpenLDAP is the more established project (first released 1998), while Kanidm arrived in 2019. Kanidm has the considerably larger community, at 5,404 GitHub stars versus 400.
Why pick each one
Choose Kanidm if…
- Memory safe and lightweight
- Excellent passwordless support
Watch out for
- Smaller ecosystem and tooling
Choose OpenLDAP if…
- Extremely mature and stable
- Universally compatible
Watch out for
- Notoriously complex configuration
Frequently asked questions
Is Kanidm or OpenLDAP better?
Kanidm is the stronger all-round pick: it has both the larger community and the simpler medium setup. Consider OpenLDAP if its specific feature set fits your needs better.
Are Kanidm and OpenLDAP free and open-source?
Yes. Kanidm is licensed under MPL-2.0 and OpenLDAP under OLDAP-2.8. Both can be self-hosted at no software cost.
Can I run Kanidm and OpenLDAP with Docker?
Kanidm: yes. OpenLDAP: yes.
Which is lighter on resources, Kanidm or OpenLDAP?
OpenLDAP has the smaller minimum footprint at 128 MB of RAM, compared to about 256 MB for Kanidm. Real-world usage depends on library size, user count, and enabled features.