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CAD · head to head

PrusaSlicer vs Zoo

PrusaSlicer logo

PrusaSlicer

CAD

Feature-rich 3D printing slicer

From
Free
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

  • Each has a real cost: PrusaSlicer limited to slicing workflow only; no interactive 3D design capabilities; 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: PrusaSlicer covers Automatic supports, Zoo covers KCL scripting.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which PrusaSlicer and Zoo actually diverge.

Attributes where PrusaSlicer and Zoo differ
AttributePrusaSlicerZoo
Pricing modelfreePer user per month
PlatformsWindows, macOS, LinuxWeb, Windows, macOS, Linux, API
Founded2012Unknown

Identical on both: starting price (Free), free tier (Yes), 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 PrusaSlicer

  • Automatic supports
  • Multi-material
  • Variable layer height
  • Custom G-code
  • Paint-on supports
  • Ironing
  • Prusa printers
  • Most FDM printers

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.

PrusaSlicer

  • Preparation of STL models for 3D printingnot Zoo
  • Multi-material printing preparationnot Zoo
  • G-code generation and customisation via macrosnot Zoo

Zoo

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

Where each one falls short

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

PrusaSlicer

  • Limited to slicing workflow only; no interactive 3D design capabilities
  • Designed for RepRap-based printers; compatibility with other printer architectures varies

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

PrusaSlicer

Free

No published plan breakdown. See the PrusaSlicer review.

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 PrusaSlicer if

  • You need automatic supports.
  • You want to start without paying.
  • You work on Windows, macOS, Linux.
  • You also want multi-material.
PrusaSlicer 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 PrusaSlicer or Zoo better?
Neither clearly leads. PrusaSlicer starts at Free and Zoo at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, PrusaSlicer or Zoo?
PrusaSlicer starts at Free and Zoo at Free.
Does PrusaSlicer or Zoo run on more platforms?
PrusaSlicer runs on Windows, macOS, Linux. Zoo runs on Web, Windows, macOS, Linux, API.
Can I use PrusaSlicer for free?
Both have a free tier, so you can try either at no cost before committing.
What is PrusaSlicer best used for?
PrusaSlicer is most often used for preparation of stl models for 3d printing, multi-material printing preparation, g-code generation and customisation via macros. Of those, preparation of stl models for 3d printing and multi-material printing preparation are not what Zoo is typically brought in for.
What can PrusaSlicer do that Zoo cannot?
PrusaSlicer covers Automatic supports, Multi-material, Variable layer height, Custom G-code. Zoo covers KCL scripting, Design Studio, Design API, Zookeeper agent.

Answered from the vendors’ own pages

PrusaSlicer: How much does PrusaSlicer cost?

PrusaSlicer is completely free and open-source software developed by Prusa Research.

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.

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.

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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