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CAD · head to head

Houdini vs Zoo

Houdini logo

Houdini

CAD

Procedural 3D animation and VFX

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: Houdini houdini Indie at $299 per year requires annual gross revenue under $100K USD; 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: Houdini covers Procedural modeling, Zoo covers KCL scripting.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Houdini and Zoo actually diverge.

Attributes where Houdini and Zoo differ
AttributeHoudiniZoo
Pricing modelsubscriptionPer user per month
PlatformsWindows, MacOS, LinuxWeb, Windows, macOS, Linux, API
Founded1987Unknown

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 Houdini

  • Procedural modeling
  • VFX
  • Simulations
  • Particle systems
  • Pyro FX
  • Ocean tools
  • Rigging
  • Rendering

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.

Houdini

  • Procedural 3D modelling and environment generationnot Zoo
  • Visual effects simulation for pyro, fluids, cloth and rigid bodiesnot Zoo
  • Building reusable procedural assets for a studio pipelinenot Zoo

Zoo

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

Where each one falls short

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

Houdini

  • Houdini Indie at $299 per year requires annual gross revenue under $100K USD
  • Houdini Indie cannot be used in the same pipeline as commercial versions of Houdini
  • Houdini Indie and Apprentice save to their own .hipnc file format, which commercial Houdini pipelines do not share
  • The free Apprentice edition is non commercial, caps render resolution at 1920x1080 and watermarks output images
  • Houdini Indie ships with only 2 render tokens
  • Full DOP level simulation node access requires Houdini FX at $4,495 per workstation; Core at $1,995 exposes only SOP level pre built simulation assets
  • Extra render tokens cost $195

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

Houdini

Free
  • ApprenticeFree
    • Learning version
    • Non-commercial
  • Indie$269/month
    • Revenue limit $100K
  • Core$1995/month
    • Full commercial
  • FX$4495/month
    • Full + simulations

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 Houdini if

  • You need procedural modeling.
  • You want to start without paying.
  • You work on Windows, MacOS, Linux.
  • You also want vfx.
Houdini 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 Houdini or Zoo better?
Neither clearly leads. Houdini 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, Houdini or Zoo?
Houdini starts at Free and Zoo at Free.
Does Houdini or Zoo run on more platforms?
Houdini runs on Windows, MacOS, Linux. Zoo runs on Web, Windows, macOS, Linux, API.
Can I use Houdini for free?
Both have a free tier, so you can try either at no cost before committing.
What is Houdini best used for?
Houdini is most often used for procedural 3d modelling and environment generation, visual effects simulation for pyro, fluids, cloth and rigid bodies, building reusable procedural assets for a studio pipeline. Of those, procedural 3d modelling and environment generation and visual effects simulation for pyro, fluids, cloth and rigid bodies are not what Zoo is typically brought in for.
What can Houdini do that Zoo cannot?
Houdini covers Procedural modeling, VFX, Simulations, Particle systems. Zoo covers KCL scripting, Design Studio, Design API, Zookeeper agent.

Answered from the vendors’ own pages

Houdini: How much does SideFX Houdini cost?

SideFX Houdini pricing is not published on their website. Specific prices for commercial, educational, and non-commercial licenses must be obtained by adding items to your cart or contacting SideFX sales directly.

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.

Houdini: What license types does Houdini offer?

Houdini offers Commercial licenses (Houdini Indie for under $100K USD annual revenue, Houdini Core, Houdini FX, Houdini Engine), Non-Commercial licenses (Houdini Apprentice free, Houdini Education for Students and Schools), Rental options, and Annual Upgrade Plans. Volume-based discounts are available for Houdini Engine.

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.

Houdini: Is Houdini available for free?

Yes. Houdini Apprentice is available free for non-commercial use. Houdini Education licenses are also available for students and schools at no cost.

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.

Houdini: Are volume discounts available for Houdini?

Yes. Volume-based discounts are available for Houdini Engine licenses. Rental and Annual Upgrade Plan pricing have been adjusted as of Houdini 21.

Source
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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