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Developer Tools · head to head

GNAT Pro vs Whimsical

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
Whimsical logo

Whimsical

Technology

Where great ideas take shape

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Only Whimsical 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; Whimsical the free plan is capped at 3 team boards, 3 teams and 10 guest seats
  • Prices and features above were last checked on 30 August 2026.

Where they differ

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

Attributes where GNAT Pro and Whimsical differ
AttributeGNAT ProWhimsical
Starting priceOn requestFree
Pricing modelquotesubscription
Free tierNoYes
CategoryDeveloper ToolsTechnology
FoundedUnknown2017

Identical on both: platforms (Web), 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 Whimsical does not also cover.

Only in Whimsical

  • Flowcharts
  • Wireframes
  • Mind maps
  • Sticky notes
  • Docs
  • Real-time collaboration
  • Templates
  • Keyboard shortcuts

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

Whimsical

  • Product planningnot GNAT Pro
  • UI/UX designnot GNAT Pro
  • Brainstormingnot GNAT Pro
  • Process documentationnot GNAT Pro
  • Project visualizationnot 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

Whimsical

  • The free plan is capped at 3 team boards, 3 teams and 10 guest seats
  • File uploads are limited to 5MB per file and 1GB in total on the free plan
  • Version history on the free plan goes back 7 days
  • Voting, the timer, private teams, the GitHub integration, password-protected files and watermark removal all need Pro at $10 per editor per month
  • SSO and SAML are Business tier only at $20 per editor per month

Pricing, plan by plan

GNAT Pro

On request

No published plan breakdown. See the GNAT Pro review.

Whimsical

Free
  • StarterFree
    • Up to 4 boards
    • Unlimited viewers
    • 7-day version history
  • Pro$10/month
    • Unlimited boards
    • Unlimited version history
    • Advanced permissions
  • Org$20/month
    • Everything in Pro
    • SSO
    • User management

Which should you pick?

Choose GNAT Pro if

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

GNAT Pro review

Choose Whimsical if

  • You need flowcharts.
  • You want to start without paying.
  • You also want wireframes.
Whimsical review

Questions people ask

Is GNAT Pro or Whimsical better?
Neither clearly leads. GNAT Pro starts at On request and Whimsical at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, GNAT Pro or Whimsical?
Whimsical has a free tier; the other does not. Paid plans start at On request for GNAT Pro and Free for Whimsical.
Does GNAT Pro or Whimsical run on more platforms?
Both run on Web, so platform support will not decide this one for you.
Can I use Whimsical for free?
Yes. Whimsical 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 Whimsical is typically brought in for.
What can GNAT Pro do that Whimsical cannot?
Whimsical covers Flowcharts, Wireframes, Mind maps, Sticky notes.

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
Whimsical: What are Whimsical's pricing tiers?

Whimsical offers three plans: Free at 0 dollars per month per editor, Pro at 10 dollars per month per editor, and Business at 20 dollars per month per editor.

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
Whimsical: What is included in the Free plan?

The Free plan allows creation of up to 50 board objects and 50 doc blocks per month, includes watermarked exports, and provides 7-day version history. Storage is limited to 1GB.

Source
Whimsical: What features unlock in the Pro plan?

The Pro plan removes the object creation limits, provides unlimited board objects and doc blocks, removes watermarks from exports, extends version history to 90 days, and offers 100GB of storage.

Source
Whimsical: What security and team features come with Business?

The Business plan adds private teams, SAML single sign-on, SCIM and advanced security controls, unlimited version history, priority support, and a dedicated success manager. Storage starts at 2TB.

Source
Whimsical: Do discounts apply for annual billing?

Yes, annual billing offers a 17 percent discount compared to monthly rates. Additionally, nonprofits receive a 20 percent discount and students and teachers get full access.

Source
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