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Developer Tools · head to head

GNAT Pro vs Harness

GNAT Pro logo

GNAT Pro

Developer Tools

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

From
On request
Rated
-
Full reviewWebsite
Harness logo

Harness

Developer Tools

Software delivery platform across CI, CD, security testing and cost management

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Harness has a free tier, so it costs nothing to try first.
  • Each has a real cost: GNAT Pro no pricing published on website; requires contacting AdaCore directly for quotes; Harness essentials and Enterprise pricing requires sales contact; no published rates
  • Prices and features above were last checked on 29 August 2026.

Where they differ

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

Attributes where GNAT Pro and Harness differ
AttributeGNAT ProHarness
Starting priceOn requestFree
Pricing modelquotefreemium
Free tierNoYes

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

What people use each for

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

GNAT Pro

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

Harness

  • Deploying apps to AWS, Azure, and Google Cloud with rollbacksnot GNAT Pro
  • Integrating security scanners throughout build pipelines before productionnot GNAT Pro
  • Automating cloud cost reduction and tracking unit-level expensesnot GNAT Pro
  • Enabling developers to provision infrastructure without operations bottlenecksnot GNAT Pro
  • Assessing deployment frequency and lead time productivity metricsnot GNAT Pro

Where each one falls short

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

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

Harness

  • Essentials and Enterprise pricing requires sales contact; no published rates
  • DevOps Essentials has no on-premises deployment option
  • Internal Developer Portal requires minimum 20 developer licenses
  • Pipeline execution history retention 6 months (Essentials) vs 25 months as add-on (Enterprise)

Pricing, plan by plan

GNAT Pro

On request

No published plan breakdown. See the GNAT Pro review.

Harness

Free
  • FreeFree
    • Starter platform for software delivery lifecycle
    • Open source options available (Harness Open Source, Litmus Chaos)
  • Essentials$null/month
    • Growing organizations with small to mid-size teams
    • Packaged DevOps Essentials bundle
    • Continuous software delivery capabilities
  • Enterprise$null/month
    • Large-scale organizations
    • Pick any modules based on needs
    • Advanced features

Which should you pick?

Choose GNAT Pro if

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

GNAT Pro review

Choose Harness if

  • You want to start without paying.
Harness review

Questions people ask

Is GNAT Pro or Harness better?
Neither clearly leads. GNAT Pro starts at On request and Harness at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, GNAT Pro or Harness?
Harness has a free tier; the other does not. Paid plans start at On request for GNAT Pro and Free for Harness.
Does GNAT Pro or Harness run on more platforms?
Both run on Web, so platform support will not decide this one for you.
Can I use Harness for free?
Yes. Harness has a free tier, so you can try it without paying. GNAT Pro starts at On request.
What is GNAT Pro best used for?
GNAT Pro is most often used for building certified avionics software meeting do-178b/c standards, developing automotive embedded systems with iso-26262 compliance, integrating ada, c/c++, and rust components in single codebase, managing software supply chain vulnerabilities and sboms. Of those, building certified avionics software meeting do-178b/c standards and developing automotive embedded systems with iso-26262 compliance are not what Harness is typically brought in for.

Answered from the vendors’ own pages

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
Harness: Is there a free Harness plan?

Yes, Harness offers a free plan for individual developers and small teams with open source options including Harness Open Source and Litmus Chaos.

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
Harness: What are Harness's paid pricing tiers?

Harness offers Essentials for growing teams and Enterprise for large-scale organizations. Both require contacting sales for custom pricing. Pricing is based on modules and features selected.

Source
Harness: Can Harness be deployed on-premises?

Enterprise plans include self-managed platform deployment option. DevOps Essentials bundle does not offer on-premises deployment.

Source
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