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Cybersecurity · head to head

authentik vs GNAT Pro

authentik logo

authentik

Cybersecurity

Open-source identity provider with flexible authentication flows

From
Free
Free plan
Yes
Full reviewWebsite
GNAT Pro logo

GNAT Pro

Developer Tools

Software development environments and toolchains for Ada, C/C++ and Rust

From
On request
Free plan
No
Full reviewWebsite

The short version

  • Only authentik has a free tier, so it costs nothing to try first.
  • Each has a real cost: authentik smaller project than Keycloak, with a correspondingly smaller community and fewer integration guides; GNAT Pro no pricing published on website; requires contacting AdaCore directly for quotes
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which authentik and GNAT Pro actually diverge.

Attributes where authentik and GNAT Pro differ
AttributeauthentikGNAT Pro
Starting priceFreeOn request
Pricing modelOpen-source core with a paid enterprise tierquote
Free tierYesNo
PlatformsDocker, Kubernetes, Linux, Self-hostedWeb
CategoryCybersecurityDeveloper Tools

Identical on both: 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 GNAT Pro

Nothing recorded that authentik does not also cover.

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 GNAT Pro
  • Putting authentication in front of applications that have none, via the proxynot GNAT Pro
  • Teams who tried Keycloak and wanted something less heavynot GNAT Pro

GNAT Pro

  • Building certified avionics software meeting DO-178B/C standardsnot authentik
  • Developing automotive embedded systems with ISO-26262 compliancenot authentik
  • Integrating Ada, C/C++, and Rust components in single codebasenot authentik
  • Managing software supply chain vulnerabilities and SBOMsnot authentik
  • Supporting long-lived software systems spanning decadesnot 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

GNAT Pro

  • No pricing published on website; requires contacting AdaCore directly for quotes
  • Vendor indicates per-user, per-year subscription model but does not disclose specific costs

Pricing, plan by plan

authentik

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

GNAT Pro

On request

No published plan breakdown. See the GNAT Pro review.

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 GNAT Pro if

Nothing in the data separates GNAT Pro from authentik on the points above - pick on price and on how each one feels to use.

GNAT Pro review

Questions people ask

Is authentik or GNAT Pro better?
Neither clearly leads. authentik starts at Free and GNAT Pro at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, authentik or GNAT Pro?
authentik has a free tier; the other does not. Paid plans start at Free for authentik and On request for GNAT Pro.
Does authentik or GNAT Pro run on more platforms?
authentik runs on Docker, Kubernetes, Linux, Self-hosted. GNAT Pro runs on Web.
Can I use authentik for free?
Yes. authentik has a free tier, so you can try it without paying. GNAT Pro starts at On request.
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 GNAT Pro is typically brought in for.
What can authentik do that GNAT Pro cannot?
authentik covers Configurable flows, Protocol support, Application proxy, Modern admin interface.

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.

GNAT Pro: How much does GNAT Pro cost?

GNAT Pro pricing is not published on the website. Customers must request a pricing quote by contacting AdaCore directly or speaking with a GNAT Pro expert.

Source
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.

GNAT Pro: What is GNAT Pro licensing model?

GNAT Pro is sold on a per-user, per-year basis with no license locks. Customers can request pricing for their specific needs.

Source
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.

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