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Developer Tools · head to head

GNAT Pro vs Milestone XProtect

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
Milestone XProtect logo

Milestone XProtect

Cybersecurity

Open platform video management software with perpetual per-device licences

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Only Milestone XProtect 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; Milestone XProtect care Plus is presented as optional but is not in practice: without it, perpetual licences stop receiving version upgrades and eventually you cannot add a current camera because your frozen version does not support it.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which GNAT Pro and Milestone XProtect actually diverge.

Attributes where GNAT Pro and Milestone XProtect differ
AttributeGNAT ProMilestone XProtect
Starting priceOn requestFree
Pricing modelquoteOne-time purchase per device licence, plus annual Care Plus
Free tierNoYes
PlatformsWebWindows, Web, iOS, Android
CategoryDeveloper ToolsCybersecurity

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 Milestone XProtect does not also cover.

Only in Milestone XProtect

  • Open device support
  • Perpetual device licences
  • Federated architecture
  • Failover recording
  • Evidence export
  • Smart Map
  • Integration platform
  • Video summarisation

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

Milestone XProtect

  • A city or transport operator running tens of thousands of cameras across federated sitesnot GNAT Pro
  • An enterprise with mixed legacy camera brands that refuses to standardise on one manufacturernot GNAT Pro
  • A critical infrastructure site needing failover recording servers and tamper-evident evidence exportnot GNAT Pro
  • An integrator building a bespoke security application on top of an open VMS platformnot 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

Milestone XProtect

  • Care Plus is presented as optional but is not in practice: without it, perpetual licences stop receiving version upgrades and eventually you cannot add a current camera because your frozen version does not support it.
  • Per-device licensing means multi-sensor and multi-imager cameras consume several licences each, so a headline camera count badly understates the true licence cost of a modern design.
  • It is Windows only for servers and needs a properly designed server and storage architecture, so the software price is a fraction of a project that also needs recording servers, storage and an integrator.
  • Complexity requires trained staff or a certified integrator; organisations that install it without either end up running a large deployment on default settings and never using the features they paid for.
  • Milestone retired Kite from its portfolio in favour of Arcules from January 2025, which stranded buyers who had standardised on Kite and is a reminder that the cloud side of the portfolio has changed direction more than once.

Pricing, plan by plan

GNAT Pro

On request

No published plan breakdown. See the GNAT Pro review.

Milestone XProtect

Free
  • XProtect Essential+Free
    • Free for up to 8 cameras
    • No recording time limit
    • No vendor support included
  • XProtect Express+$109/one-time
    • Perpetual device licence, distributor list price
    • Single site, single server
    • Care Plus purchased separately per device per year
  • XProtect Professional+$177/one-time
    • Perpetual device licence, distributor list price
    • Multiple recording servers
    • Edge storage retrieval
  • XProtect Expert$282/one-time
    • Perpetual device licence, distributor list price
    • Failover recording servers
    • Advanced video wall and evidence handling

Which should you pick?

Choose GNAT Pro if

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

GNAT Pro review

Choose Milestone XProtect if

  • You need open device support.
  • You want to start without paying.
  • You work on Windows, Web, iOS, Android.
  • You also want perpetual device licences.
Milestone XProtect review

Questions people ask

Is GNAT Pro or Milestone XProtect better?
Neither clearly leads. GNAT Pro starts at On request and Milestone XProtect at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, GNAT Pro or Milestone XProtect?
Milestone XProtect has a free tier; the other does not. Paid plans start at On request for GNAT Pro and Free for Milestone XProtect.
Does GNAT Pro or Milestone XProtect run on more platforms?
GNAT Pro runs on Web. Milestone XProtect runs on Windows, Web, iOS, Android.
Can I use Milestone XProtect for free?
Yes. Milestone XProtect 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 Milestone XProtect is typically brought in for.
What can GNAT Pro do that Milestone XProtect cannot?
Milestone XProtect covers Open device support, Perpetual device licences, Federated architecture, Failover recording.

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
Milestone XProtect: Is XProtect really free for small sites?

Essential+ is free for up to eight cameras with no recording time limit, but it comes with no vendor support and no multi-server capability.

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
Milestone XProtect: Are licences perpetual or annual?

Device licences are perpetual. The annual cost is Care Plus, the support and software update contract, which you need to stay on current versions.

Milestone XProtect: What happens if I do not renew Care Plus?

The system keeps recording, but you stop getting version upgrades, and over a few years that blocks you from adding newer cameras.

Milestone XProtect: Who owns Milestone?

Canon. The portfolio also includes BriefCam analytics and Arcules cloud video, with Arcules replacing Milestone Kite from January 2025.

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