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GNAT Pro vs Keygen

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
Keygen logo

Keygen

Cybersecurity

Open, source-available software licensing API

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Only Keygen 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; Keygen specific Active Licensed User (ALU) pricing not listed; requires interactive pricing calculator
  • Prices and features above were last checked on 29 August 2026.

Where they differ

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

Attributes where GNAT Pro and Keygen differ
AttributeGNAT ProKeygen
Starting priceOn requestFree
Pricing modelquoteusage-based
Free tierNoYes
CategoryDeveloper ToolsCybersecurity

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.

GNAT Pro

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

Keygen

  • Software licensing and distributionnot GNAT Pro
  • Product release managementnot GNAT Pro
  • API-based license verificationnot 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

Keygen

  • Specific Active Licensed User (ALU) pricing not listed; requires interactive pricing calculator
  • Whitelabel API add-on costs $995/year per domain

Pricing, plan by plan

GNAT Pro

On request

No published plan breakdown. See the GNAT Pro review.

Keygen

Free
  • DevFree
    • Up to 100 Active Licensed Users
    • 10 product releases
    • Core licensing API only
  • Std$null/month
    • Scaling with licensing volume
    • Distribution API (OCI/Docker, npm, Rubygems, PyPI, Tauri)
    • Flat monthly/yearly fees
  • Enterprise$null/month
    • Audit logs
    • SAML/SSO
    • IP filtering

Which should you pick?

Choose GNAT Pro if

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

GNAT Pro review

Choose Keygen if

  • You want to start without paying.
Keygen review

Questions people ask

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

Yes, the Dev tier is free and supports up to 100 Active Licensed Users with 10 product releases and core licensing API access.

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
Keygen: How is Keygen pricing calculated?

Keygen uses scalable, flat monthly or yearly fees based on your licensing volume (Active Licensed Users). No revenue share or transaction fees are charged.

Source
Keygen: Does Keygen charge for additional features like SSO?

SAML/SSO is included in Enterprise tiers. Whitelabel API support costs $995/year per domain. Premium Support SLA is $995/month for Enterprise.

Source
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