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CAD · head to head

Siemens NX vs Zoo

Siemens NX logo

Siemens NX

CAD

Integrated product design and manufacturing

From
$29/month
Rated
-
Full reviewWebsite
Zoo logo

Zoo

CAD

Cloud CAD with a scripting language and a geometry engine exposed as an API

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Zoo has a free tier, so it costs nothing to try first.
  • Each has a real cost: Siemens NX siemens NX offers only a 30-day free trial with no published subscription or perpetual license price; buyers must go through a sales process to get pricing, per the vendor's own product page.; Zoo the geometry engine runs entirely in Zoo's cloud and there is no offline mode, so an aircraft, a customer site with no guest wifi or an outage stops modelling work completely.
  • They diverge on capability: Siemens NX covers Advanced CAD, Zoo covers KCL scripting.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Siemens NX and Zoo actually diverge.

Attributes where Siemens NX and Zoo differ
AttributeSiemens NXZoo
Starting price$29/monthFree
Pricing modelsubscriptionPer user per month
Free tierNoYes
PlatformsWindows, LinuxWeb, Windows, macOS, Linux, API
Founded1963Unknown

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

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 Siemens NX

  • Advanced CAD
  • CAM programming
  • CAE simulation
  • Additive manufacturing
  • Sheet metal
  • Mold design
  • Industrial machinery
  • Teamcenter PLM

Only in Zoo

  • KCL scripting
  • Design Studio
  • Design API
  • Zookeeper agent
  • Format conversion
  • Open source client

What people use each for

The jobs each tool is most often brought in to do.

Siemens NX

  • Enterprise product designnot Zoo
  • Manufacturingnot Zoo
  • Simulationnot Zoo

Zoo

  • A hardware startup that wants part models reviewed in pull requests alongside firmwarenot Siemens NX
  • A software team generating thousands of parametric part variants programmatically rather than by handnot Siemens NX
  • A SaaS product that needs to render and convert customer CAD files without licensing a geometry kernelnot Siemens NX
  • An engineer who models occasional brackets and enclosures and does not want a four figure annual seatnot Siemens NX

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Siemens NX

  • Siemens NX offers only a 30-day free trial with no published subscription or perpetual license price; buyers must go through a sales process to get pricing, per the vendor's own product page.

Zoo

  • The geometry engine runs entirely in Zoo's cloud and there is no offline mode, so an aircraft, a customer site with no guest wifi or an outage stops modelling work completely.
  • STEP and SLDPRT import are still labelled experimental, which means the most common way of receiving a supplier or customer model is the least reliable path into the tool.
  • Drawing production, GD&T and tolerance annotation are far behind SolidWorks, Creo and NX, so most users still need a second package to release a manufacturing drawing.
  • Zookeeper is billed in reasoning minutes rather than per seat, so a team cannot forecast next month's bill from headcount the way it can with conventional CAD subscriptions.
  • The open source label applies only to the Design Studio client; the kernel that does the modelling is closed and hosted, so forking the repository does not give you a product you can run yourself.

Pricing, plan by plan

Siemens NX

$29/month
  • NX Design$4500/month
    • CAD design
    • Core modeling
  • NX CAM$5500/month
    • Manufacturing programming
  • NX Complete$8500/month
    • Full suite
    • CAD/CAM/CAE

Zoo

Free
  • FreeFree
    • Design Studio access
    • About 20 minutes of Zookeeper reasoning per month
    • Around $10 of API calls included
  • Plus$20/month
    • Roughly 400 Zookeeper minutes per month
    • Pay as you go beyond the allowance
    • Design Studio and API access
  • Pro$99/month
    • Unlimited Zookeeper reasoning
    • Higher API allowance
    • Priority support

Which should you pick?

Choose Siemens NX if

  • You need advanced cad.
  • You work on Windows, Linux.
  • You also want cam programming.
Siemens NX review

Choose Zoo if

  • You need kcl scripting.
  • You want to start without paying.
  • You work on Web, Windows, macOS, Linux, API.
  • You also want design studio.
Zoo review

Questions people ask

Is Siemens NX or Zoo better?
Neither clearly leads. Siemens NX starts at $29/month and Zoo at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Siemens NX or Zoo?
Zoo has a free tier; the other does not. Paid plans start at $29/month for Siemens NX and Free for Zoo.
Does Siemens NX or Zoo run on more platforms?
Siemens NX runs on Windows, Linux. Zoo runs on Web, Windows, macOS, Linux, API.
Can I use Zoo for free?
Yes. Zoo has a free tier, so you can try it without paying. Siemens NX starts at $29/month.
What is Siemens NX best used for?
Siemens NX is most often used for enterprise product design, manufacturing, simulation. Of those, enterprise product design and manufacturing are not what Zoo is typically brought in for.
What can Siemens NX do that Zoo cannot?
Siemens NX covers Advanced CAD, CAM programming, CAE simulation, Additive manufacturing. Zoo covers KCL scripting, Design Studio, Design API, Zookeeper agent.

Answered from the vendors’ own pages

Siemens NX: Does Siemens NX offer a free trial?

Yes, Siemens offers a 30-day free trial of both Designcenter CAD and NX CAM software that is fully functional. Users can get a hands-on feel for the software without any financial commitment before purchasing.

Source
Zoo: Is Zoo the same company as KittyCAD?

Yes. KittyCAD renamed itself Zoo; the GitHub organisation is still KittyCAD and the scripting language KCL keeps the old initials.

Siemens NX: Is NX free for students?

Yes, Siemens offers free CAD/CAM Student Edition access to Designcenter and NX for students and educators. Academic offerings are available for those in educational institutions.

Source
Zoo: Can I use Zoo without an internet connection?

No. The geometry engine is a cloud service, so Design Studio needs a live connection to model anything.

Siemens NX: What licensing options does NX provide for different business sizes?

Siemens offers scalable licensing for startups, mid-size companies, and multinational corporations. Designcenter and NX CAM support flexible team-based licensing to match organizational size and manufacturing needs.

Source
Zoo: Is Design Studio free?

There is a genuine free tier with a small monthly allowance of AI reasoning and API calls. Paid plans start at $20 per month.

Zoo: Can I replace SolidWorks with Zoo?

Not for drawing release, large assemblies or GD&T. Teams typically use Zoo for programmatic part generation and keep an established package for production documentation.

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