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Developer Tools · head to head

GNAT Pro vs Read the Docs

GNAT Pro logo

GNAT Pro

Developer Tools

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

From
On request
Rated
-
Full reviewWebsite
Read the Docs logo

Read the Docs

Documentation

Documentation hosting with versioning built for open source

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Read the Docs 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; Read the Docs build configuration is finicky, and build failures on dependency changes are a common frustration

Where they differ

Only the attributes on which GNAT Pro and Read the Docs actually diverge.

Attributes where GNAT Pro and Read the Docs differ
AttributeGNAT ProRead the Docs
Starting priceOn requestFree
Pricing modelquoteFree for open source; paid business plans for private documentation
Free tierNoYes
PlatformsWebWeb, Cloud
CategoryDeveloper ToolsDocumentation

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

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in GNAT Pro

Nothing recorded that Read the Docs does not also cover.

Only in Read the Docs

  • Build on commit
  • Version by branch and tag
  • Pull request previews
  • Free for open source

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

Read the Docs

  • Open-source projects needing free hosted versioned documentationnot GNAT Pro
  • Teams wanting docs rebuilt automatically on every commitnot GNAT Pro
  • Reviewing documentation changes in a pull request before mergenot 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

Read the Docs

  • Build configuration is finicky, and build failures on dependency changes are a common frustration
  • Default themes are recognisable and dated, so sites look alike unless customised
  • Private documentation requires a paid business plan
  • Build times on large projects are slow enough to interrupt a review cycle

Pricing, plan by plan

GNAT Pro

On request

No published plan breakdown. See the GNAT Pro review.

Read the Docs

Free
  • FreeFree
    • Core functionality
    • Public projects

Which should you pick?

Choose GNAT Pro if

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

GNAT Pro review

Choose Read the Docs if

  • You need build on commit.
  • You want to start without paying.
  • You work on Web, Cloud.
  • You also want version by branch and tag.
Read the Docs review

Questions people ask

Is GNAT Pro or Read the Docs better?
Neither clearly leads. GNAT Pro starts at On request and Read the Docs at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, GNAT Pro or Read the Docs?
Read the Docs has a free tier; the other does not. Paid plans start at On request for GNAT Pro and Free for Read the Docs.
Does GNAT Pro or Read the Docs run on more platforms?
GNAT Pro runs on Web. Read the Docs runs on Web, Cloud.
Can I use Read the Docs for free?
Yes. Read the Docs 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 Read the Docs is typically brought in for.
What can GNAT Pro do that Read the Docs cannot?
Read the Docs covers Build on commit, Version by branch and tag, Pull request previews, Free for open source.

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
Read the Docs: Is Read the Docs free?

Free for open-source public projects. Private documentation requires a paid business plan.

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
Read the Docs: What does it build from?

Most commonly Sphinx or MkDocs sources kept in your repository.

Read the Docs: How does versioning work?

It maps branches and tags to documentation versions, so several releases are served side by side without manual work.

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