Kanidm supports:

• Passkeys (WebAuthn) for secure cryptographic authentication
• Attested passkeys for high security environments
• OAuth2/OIDC authentication provider for web SSO
• Application Portal allowing easy access to linked applications
• Linux/Unix integration with TPM secured offline authentication
• SSH key distribution to Linux/Unix systems
• RADIUS for network and VPN authentication
• Read-only LDAPs gateway for Legacy Systems
• Complete CLI tooling for Administration
• Two node high availability using database replication
• A WebUI for user self-service

LLDAP is a similar project aiming for a small and easy to administer LDAP server with a web administration portal. Both projects use the Kanidm LDAP bindings, and have many similar ideas.

The primary benefit of Kanidm over LLDAP is that Kanidm offers a broader set of "built-in" features like OAuth2 and OIDC. To use these from LLDAP you need an external portal like Keycloak. However, that is also a strength of LLDAP is that is offers "less" which may make it easier to administer and deploy for you.

While LLDAP offers a simple WebUI as the primary user management frontend, Kanidm currently only offers administration functionality via its CLI. The Kanidm WebUI is tailored to user interactions.

If Kanidm is too complex for your needs, you should check out LLDAP as a smaller alternative. If you want a project which has a broader feature set out of the box, then Kanidm will be a better fit.

If you need the highest levels of customisation possible from your LDAP deployment, then these are probably better alternatives. If you want a service that is easy to set up and focused on IDM, then Kanidm is a better choice.

Kanidm was originally inspired by many elements of both 389-ds and OpenLDAP. Already Kanidm is as fast as (or faster than) 389-ds for performance and scaling as a directory service while having a richer feature set.

FreeIPA is another identity management service for Linux/Unix, and ships a huge number of features from LDAP, Kerberos, DNS, Certificate Authority, and more.

FreeIPA however is a complex system, with a huge amount of parts and configuration. This adds a lot of resource overhead and difficulty for administration and upgrades.

Kanidm aims to have the features richness of FreeIPA, but without the resource and administration overheads. If you want a complete IDM package, but in a lighter footprint and easier to manage, then Kanidm is probably for you. In testing with 3000 users and 1500 groups, Kanidm is 3 times faster for search operations and 5 times faster for modification and addition of entries (your results may differ however, but generally Kanidm is much faster than FreeIPA).

Keycloak is an OIDC/OAuth2/SAML provider. It allows you to layer on WebAuthn to existing IDM systems. Keycloak can operate as a stand-alone IDM but generally is a component attached to an existing LDAP server or similar.

Keycloak requires a significant amount of configuration and experience to deploy. It allows high levels of customisation to every detail of its authentication work flows, which makes it harder to start with in many cases.

Kanidm does NOT require Keycloak to provide services such as OAuth2 and integrates many of the elements in a simpler and correct way out of the box in comparison.

Rauthy is a minimal OIDC provider. It supports WebAuthn just like Kanidm - they actually use our libraries for it!

Rauthy only provides support for OIDC and so is unable to support other use cases like RADIUS and unix authentication.

If you need a minimal OIDC only provider, Rauthy is an excellent choice. If you need more features then Kanidm will support those.

Authentik is an IDM provider written in Python and, Authelia and Zitadel are written in Go. all similar to Kanidm in the features it offers but notably all have weaker support for UNIX authentication and do not support the same level of authentication policy as Kanidm. Notably, all are missing WebAuthn Attestation.

All three use an external SQL server such as PostgreSQL. This can create a potential single source of failure and performance limitation compared to Kanidm which opted to write our own high performance database and replication system instead based on our experience with enterprise LDAP servers.