authentik vs Kanidm

authentik is administered through a web console, where day-to-day work is building flows, creating providers and binding them to applications, and managing outposts that run next to the apps they protect. A helpdesk analyst can reset a user, review sessions and check which applications a person can reach without touching a shell. Kanidm takes the opposite default. Its README says administration is offered primarily through its CLI, and its web UI is designed more for user interactions such as signing in, managing a passkey or using the application portal than for running the directory. The practical split is therefore between teams that want a visual control plane for many people and teams that are comfortable scripting identity work from a terminal.

Helpdesk staff and service desk operators usually benefit more from the authentik model, since most of their tasks map to screens and saved configuration rather than command syntax. Linux and platform administrators often prefer Kanidm, because account, group, Unix and SSH settings can be scripted, reviewed in version control and repeated across environments. Neither model is wrong, but the reader should decide who will do the routine work in month three, not only who will set the system up. Ask whether a non-specialist can complete a password reset, a lockout or an application grant on their own, and whether the runbook for that task is written in clicks or in commands.

In a pilot, run the same five tasks on both platforms: create a user, add them to a group, grant access to one OIDC application, revoke that access, and recover an account with a registered passkey. Time each task and note who needed help. Also test the paths that matter most to your environment, such as authentik's flow editing for a custom enrollment step or Kanidm's CLI workflow for a Linux host login. Check the current authentik documentation for the provider settings you plan to use, and confirm with Kanidm which administrative actions are available in its web UI for your release before you assume a task can be done without the terminal.

Kanidm's upgrade rhythm is the stricter of the two, and a small team has to plan around it. Kanidm releases quarterly, on February 1, May 1, August 1 and November 1, and supports each stable release for four months. It also supports upgrades only from the previous minor version, so moving from 1.2.0 to 1.3.0 is valid while jumping to 1.4.0 is not. The current release is v1.11.2, released on September 11, 2026, following v1.11.0 on August 2, 2026. A team that falls two minor versions behind must step through each intermediate release in order, testing each one, before reaching a supported line. Confirm the exact upgrade sequence in the Kanidm support guidelines before scheduling any change window.

authentik uses year-and-month versioning, and its upgrade planning centers on which line you run. The current release is 2026.8.4, published on October 14, 2026. The security policy lists 2026.5.x and 2026.8.x as the lines receiving security fixes, and the project announces security releases at least 24 hours in advance. For a small team, that means choosing a supported line deliberately, subscribing to the GitHub releases page, and building a routine to move to the next line before the current one drops out of support. Because authentik keeps configuration in PostgreSQL and changed its caching and session handling in the 2025.10 release, read that release's notes and confirm the required steps for your target version in the authentik documentation before you upgrade.

Plan authentik work around three components: the server container with its embedded outpost, the worker container, and PostgreSQL, which holds all configuration and data except uploaded files. The authentik architecture documentation describes this layout, and the Docker Compose guide positions Compose for test setups and small-scale production, so a production design with high availability, backups and PostgreSQL tuning needs its own written scope. Flow and provider design is usually the largest block of effort: each application needs an OAuth2/OIDC, SAML, LDAP, RADIUS or proxy provider, bound to flows for login, MFA and enrollment. If you need the Enterprise edition for Entra ID or Google Workspace sync, mTLS or privileged access management, the license setup and subscription are an additional workstream. Confirm the license scope with authentik before estimating. Outposts for proxy or RAC access add network placement work, since each one must reach the applications it protects.

Kanidm asks for different work. TLS is mandatory for all connections, so certificate issuance, renewal and trust distribution to every client come first. The Kanidm README describes two-node high availability through replication, and that setup needs a tested failover runbook, because the database and replication are Kanidm's own rather than an external PostgreSQL you may already operate. Administration runs primarily through the CLI, with the web UI designed more for user interactions, so plan for administrators to learn the CLI and for procedures to be written down. Unix and SSH work is distinctive: client configuration for Linux login, TPM-protected offline authentication and SSH key distribution must be rolled out and tested on each host class.

Projects run long for predictable reasons. A SAML integration found late is the most common: Kanidm does not list SAML among its features, and the maintainers direct users to OAuth2/OIDC first, LDAP app passwords second and SAML only as a last resort, so any SAML-only application should be inventoried before choosing Kanidm. Legacy LDAP clients stall when their bind, group and attribute expectations differ from the read-only LDAPS gateway, so test each client against that gateway early. Passkey enrollment rollout slows when users, help desks and attestation policies are not planned together, and it should be piloted with a small group first. Ask any implementation partner, DeployOpen included, to scope these items in writing before work starts, with named deliverables and a test plan for each.

The running cost of either platform is mostly people time, not software fees. For authentik, the core is MIT licensed, so the licence line only appears if you need code under authentik/enterprise, which requires a paid subscription for production use. The authentik pricing page lists Enterprise at $5 per user per month billed annually plus $0.02 per external user per month, and Enterprise Plus starting at $20k annually, so confirm which tier covers the features you need before comparing totals. Kanidm is MPL-2.0 with no paid edition in the supplied facts, so its recurring cost is staff time and infrastructure, plus any support retainer you buy from a vendor or from DeployOpen. Ask your own platform team who will carry each role, because on either product the largest recurring line is usually the engineer who applies upgrades and reviews logs.

Database administration differs sharply between the two. authentik stores configuration and data in PostgreSQL and runs a worker container, so someone must own backups, connection capacity and PostgreSQL upgrades. The 2025.10 release notes warn of roughly 50% more PostgreSQL connections after upgrading, which is a capacity item to plan for. Kanidm uses its own database and replication, which removes an external database from the run book, but it expects you to learn its CLI, since the README says administration is offered primarily through the CLI. Kanidm also releases quarterly and supports upgrades only from the previous minor version, so skipping a release forces a multi-step upgrade that needs test time. authentik supports its 2026.5.x and 2026.8.x lines for security fixes and gives at least 24 hours of notice before security releases, which shapes how quickly you must schedule a patch window.

One-time costs are design, integration of each application, migration of existing users and any SAML or LDAP bridging, and the first hardening pass. Recurring costs are subscriptions, upgrade testing, monitoring and on-call time. Because Kanidm does not offer SAML, any SAML-only application may need an extra integration effort or a different product, so ask for that work to be scoped separately. When requesting a written quote from DeployOpen or any vendor, ask for: the named components and versions in scope, who performs each upgrade and how many test cycles are included, the handling of PostgreSQL or replication monitoring, the Enterprise tier and seat count if applicable, what support response is covered and what is excluded, and the exit or handover effort if you switch later. A DeployOpen quote follows from a written, fixed scope.