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Cybersecurity · head to head

authentik vs Flux

authentik logo

authentik

Cybersecurity

Open-source identity provider with flexible authentication flows

From
Free
Rated
-
Full reviewWebsite
Flux logo

Flux

Cloud

GitOps continuous delivery for Kubernetes

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: authentik smaller project than Keycloak, with a correspondingly smaller community and fewer integration guides; Flux no user interface of its own: observing what Flux is doing means CLI or a third-party dashboard
  • They diverge on capability: authentik covers Configurable flows, Flux covers Git as source of truth.
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which authentik and Flux actually diverge.

Attributes where authentik and Flux differ
AttributeauthentikFlux
Pricing modelOpen-source core with a paid enterprise tierOpen source, no licence fee
PlatformsDocker, Kubernetes, Linux, Self-hostedKubernetes, Linux
CategoryCybersecurityCloud

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in authentik

  • Configurable flows
  • Protocol support
  • Application proxy
  • Modern admin interface

Only in Flux

  • Git as source of truth
  • Pull-based delivery
  • Helm and Kustomize support
  • Automated image updates

What people use each for

The jobs each tool is most often brought in to do.

authentik

  • Self-hosted SSO across internal services without commercial identity pricingnot Flux
  • Putting authentication in front of applications that have none, via the proxynot Flux
  • Teams who tried Keycloak and wanted something less heavynot Flux

Flux

  • Removing cluster credentials from CI systemsnot authentik
  • Keeping many clusters consistent with a single declared statenot authentik
  • Automatically correcting configuration drift rather than discovering it laternot authentik

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

authentik

  • Smaller project than Keycloak, with a correspondingly smaller community and fewer integration guides
  • The flow model is flexible but conceptually unfamiliar, and simple setups can feel over-abstracted
  • Enterprise support and some governance features sit behind the paid tier
  • Self-hosted identity is still yours to secure, patch and keep available

Flux

  • No user interface of its own: observing what Flux is doing means CLI or a third-party dashboard
  • Debugging a stuck reconciliation is harder than reading a pipeline log, because failure is asynchronous
  • Everything must be in Git, which is awkward for secrets and needs a sealed-secrets or external-secrets approach
  • GitOps is a workflow change, not just a tool, and teams used to imperative deploys find the adjustment real

Pricing, plan by plan

authentik

Free
  • Open sourceFree
    • Full identity provider
    • All protocols
    • Community support

Flux

Free
  • FluxFree
    • Full functionality
    • No usage limits
    • Community support

Which should you pick?

Choose authentik if

  • You need configurable flows.
  • You want to start without paying.
  • You work on Docker, Kubernetes, Linux, Self-hosted.
  • You also want protocol support.
authentik review

Choose Flux if

  • You need git as source of truth.
  • You want to start without paying.
  • You work on Kubernetes, Linux.
  • You also want pull-based delivery.
Flux review

Questions people ask

Is authentik or Flux better?
Neither clearly leads. authentik starts at Free and Flux at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, authentik or Flux?
authentik starts at Free and Flux at Free.
Does authentik or Flux run on more platforms?
authentik runs on Docker, Kubernetes, Linux, Self-hosted. Flux runs on Kubernetes, Linux.
Can I use authentik for free?
Both have a free tier, so you can try either at no cost before committing.
What is authentik best used for?
authentik is most often used for self-hosted sso across internal services without commercial identity pricing, putting authentication in front of applications that have none, via the proxy, teams who tried keycloak and wanted something less heavy. Of those, self-hosted sso across internal services without commercial identity pricing and putting authentication in front of applications that have none, via the proxy are not what Flux is typically brought in for.
What can authentik do that Flux cannot?
authentik covers Configurable flows, Protocol support, Application proxy, Modern admin interface. Flux covers Git as source of truth, Pull-based delivery, Helm and Kustomize support, Automated image updates.

Answered from the vendors’ own pages

authentik: Is authentik free?

The open-source edition is free and complete for most use. An enterprise tier adds support and additional features.

Flux: Is Flux free?

Yes, open source and CNCF-graduated.

authentik: authentik or Keycloak?

authentik is generally reported as easier to run and administer; Keycloak is more established with a larger community and Red Hat behind it.

Flux: Flux or Argo CD?

Both implement GitOps. Argo CD ships a strong web UI and is often preferred for visibility; Flux is more modular and composes as controllers, which suits platform teams.

authentik: Can authentik protect apps with no login of their own?

Yes. Its application proxy places authentication in front of services that have no built-in authentication.

Flux: Why is pull-based safer?

Because the cluster reaches out to Git rather than CI reaching into the cluster. No external system needs write credentials to production.

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