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Developer Tools · head to head

GNAT Pro vs HCP Terraform

GNAT Pro logo

GNAT Pro

Developer Tools

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

From
On request
Rated
-
Full reviewWebsite
HCP Terraform logo

HCP Terraform

Developer Tools

Infrastructure as code provisioning and management, formerly Terraform Cloud

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only HCP Terraform 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; HCP Terraform legacy free version deprecated; no current freemium tier
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which GNAT Pro and HCP Terraform actually diverge.

Attributes where GNAT Pro and HCP Terraform differ
AttributeGNAT ProHCP Terraform
Starting priceOn requestFree
Pricing modelquoteusage-based
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 HCP Terraform
  • Developing automotive embedded systems with ISO-26262 compliancenot HCP Terraform
  • Integrating Ada, C/C++, and Rust components in single codebasenot HCP Terraform
  • Managing software supply chain vulnerabilities and SBOMsnot HCP Terraform
  • Supporting long-lived software systems spanning decadesnot HCP Terraform

HCP Terraform

  • Infrastructure as Code managementnot GNAT Pro
  • Cloud resource provisioningnot 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

HCP Terraform

  • Legacy free version deprecated; no current freemium tier
  • New users receive $500 credit but still require usage to continue service
  • Terraform Enterprise requires custom pricing

Pricing, plan by plan

GNAT Pro

On request

No published plan breakdown. See the GNAT Pro review.

HCP Terraform

Free
  • Essentials$0.1/month
    • Per resource pricing
    • Remote state storage
    • VCS connection
  • Standard$0.47/month
    • Per resource pricing
    • Essentials features plus unlimited modules
    • Module deprecation
  • Premium$0.99/month
    • Per resource pricing
    • Standard features plus module revocation
    • Waypoint actions

Which should you pick?

Choose GNAT Pro if

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

GNAT Pro review

Choose HCP Terraform if

  • You want to start without paying.
HCP Terraform review

Questions people ask

Is GNAT Pro or HCP Terraform better?
Neither clearly leads. GNAT Pro starts at On request and HCP Terraform at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, GNAT Pro or HCP Terraform?
HCP Terraform has a free tier; the other does not. Paid plans start at On request for GNAT Pro and Free for HCP Terraform.
Does GNAT Pro or HCP Terraform run on more platforms?
Both run on Web, so platform support will not decide this one for you.
Can I use HCP Terraform for free?
Yes. HCP Terraform 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 HCP Terraform 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
HCP Terraform: How much does HCP Terraform cost?

HCP Terraform uses per-resource pricing starting at $0.10/month/resource for Essentials, $0.47/month/resource for Standard, and $0.99/month/resource for Premium.

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
HCP Terraform: Does HCP Terraform offer a free tier?

No, the legacy free version has been deprecated. However, new users receive $500 credit to try the service.

Source
HCP Terraform: What does the Standard plan include?

Standard plan at $0.47/month/resource includes unlimited modules, module deprecation, team notifications, no-code provisioning, and Waypoint templates.

Source
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