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Checkmk vs GNAT Pro

Checkmk logo

Checkmk

Technology

Comprehensive IT monitoring, open and flexible

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 Checkmk has a free tier, so it costs nothing to try first.
  • Each has a real cost: Checkmk pricing calculated by service count, not hosts (approximately 30 services per host on average); 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 Checkmk and GNAT Pro actually diverge.

Attributes where Checkmk and GNAT Pro differ
AttributeCheckmkGNAT Pro
Starting priceFreeOn request
Pricing modelsubscriptionquote
Free tierYesNo
CategoryTechnologyDeveloper Tools

Identical on both: platforms (Web), user rating (Not yet rated).

What people use each for

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

Checkmk

  • Infrastructure monitoringnot GNAT Pro
  • System observabilitynot GNAT Pro
  • Enterprise compliance monitoringnot GNAT Pro

GNAT Pro

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

Where each one falls short

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

Checkmk

  • Pricing calculated by service count, not hosts (approximately 30 services per host on average)
  • Professional support limited to 8-10 hours per week on base plans
  • Synthetic monitoring is separate add-on with per-test pricing

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

Checkmk

Free
  • Community (Self-Hosted)Free
    • No cost, forever
    • Up to ~100 hosts
    • Basic infrastructure monitoring
  • Pro (Self-Hosted)$190/month
    • Advanced analytics
    • Reporting
    • Distributed monitoring
  • Ultimate (Self-Hosted)$275/month
    • Full-stack observability
    • Advanced security compliance
    • 10 hours x 5 days professional support (upgradable to 24/7)
  • CloudAI (SaaS)$240/month
    • Fully managed cloud hosting
    • 99.5% uptime SLA
    • Supports up to 50000 services

GNAT Pro

On request

No published plan breakdown. See the GNAT Pro review.

Which should you pick?

Choose Checkmk if

  • You want to start without paying.
Checkmk review

Choose GNAT Pro if

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

GNAT Pro review

Questions people ask

Is Checkmk or GNAT Pro better?
Neither clearly leads. Checkmk 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, Checkmk or GNAT Pro?
Checkmk has a free tier; the other does not. Paid plans start at Free for Checkmk and On request for GNAT Pro.
Does Checkmk or GNAT Pro run on more platforms?
Both run on Web, so platform support will not decide this one for you.
Can I use Checkmk for free?
Yes. Checkmk has a free tier, so you can try it without paying. GNAT Pro starts at On request.
What is Checkmk best used for?
Checkmk is most often used for infrastructure monitoring, system observability, enterprise compliance monitoring. Of those, infrastructure monitoring and system observability are not what GNAT Pro is typically brought in for.

Answered from the vendors’ own pages

Checkmk: Is there a free version of Checkmk?

Yes, Checkmk Community edition is free forever and supports up to approximately 100 hosts for basic infrastructure monitoring with no cost.

Source
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
Checkmk: How does Checkmk calculate pricing by host count?

Checkmk uses service-based pricing where each monitored aspect (file system, hardware sensor, switch port, metric) counts as one service. On average, there are approximately 30 services per host.

Source
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
Checkmk: What is the difference between Checkmk Pro and Ultimate tiers?

Pro tier at 190 EUR/month includes advanced analytics and 8x5 support, while Ultimate at 275 EUR/month adds full-stack observability, advanced compliance features, and upgradable 24/7 support.

Source
Checkmk: Does Checkmk offer a managed SaaS option?

Yes, Checkmk CloudAI is a fully managed SaaS tier at 240 EUR/month with 99.5% uptime SLA and support for up to 50000 services.

Source
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