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Developer Tools · head to head

GNAT Pro vs Subframe

GNAT Pro logo

GNAT Pro

Developer Tools

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

From
On request
Free plan
No
Visit GNAT ProFull review
Subframe logo

Subframe

Design

The AI-native design tool built for code

From
Free
Free plan
Yes
Visit SubframeFull review

The short version

  • Subframe starts at $29/mo; GNAT Pro prices on request.
  • Where GNAT Pro falls short: no pricing published on website; requires contacting AdaCore directly for quotes.
  • Where Subframe falls short: free plan limited to 1 project and 10 pages.
  • Prices and features on this page were last checked on 13 November 2026.

Where they differ

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

Attributes where GNAT Pro and Subframe differ
AttributeGNAT ProSubframe
Starting priceOn requestFree
Pricing modelQuoteFreemium
Free tierNoYes
CategoryDeveloper ToolsDesign

Identical on both: platforms (Web).

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 Subframe
  • Developing automotive embedded systems with ISO-26262 compliancenot Subframe
  • Integrating Ada, C/C++, and Rust components in single codebasenot Subframe
  • Managing software supply chain vulnerabilities and SBOMsnot Subframe
  • Supporting long-lived software systems spanning decadesnot Subframe

Subframe

  • Creating production-ready interfaces without static mockupsnot GNAT Pro
  • Syncing design components with code as single source of truthnot GNAT Pro
  • Building responsive designs with auto layoutnot GNAT Pro
  • Real-time multiplayer collaboration with layer commentingnot GNAT Pro
  • Exporting Radix UI and Tailwind CSS code via CLInot 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

Subframe

  • Free plan limited to 1 project and 10 pages
  • Free plan includes limited AI features compared to Pro
  • Pro plan billed per editor, not per team

Pricing, plan by plan

GNAT Pro

On request

No published plan breakdown. See the GNAT Pro review.

Subframe

Free
  • FreeFree
    • 1 project
    • Up to 10 pages
    • 2 prototypes
  • Pro$29/mo
    • Unlimited projects
    • Unlimited pages
    • Unlimited prototypes

Which should you pick?

Choose GNAT Pro if

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

GNAT Pro review

Choose Subframe if

  • You want to start without paying.
Subframe review

Questions people ask

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

Yes, Subframe offers a free plan with 1 project, up to 10 pages, 2 prototypes, unlimited team members, and limited AI features.

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
Subframe: How is the Pro plan priced?

Subframe Pro costs $29 per editor per month, with unlimited projects, pages, prototypes, and AI usage.

Source
Subframe: Are viewer seats free?

Yes, Subframe offers free viewer seats across all pricing plans, allowing team members to view without an editor license.

Source
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