AI 3D Modeling Comparison

Spline AI vs. Zoo Design Studio

At a glance

Spline AI

Best for

Best for web teams building interactive, stylized 3D experiences without a Blender pipeline.

Freelancers
Small and mid-sized
Enterprise

Zoo Design Studio

Best for

Best for engineers and product teams who want AI-generated geometry that stays editable in a real CAD feature tree.

Freelancers
Small and mid-sized
Enterprise

Cataleo does not name a winner. Both statements come from the vendors themselves.

Full Comparison

Criterion	Spline AI	Zoo Design Studio
Starting price	Free tier; Hobby from $15 / seat / month Or $12 per seat per month billed yearly. Pro is $30 and Max $70 per seat per month, or $25 and $60 billed yearly. Enterprise is quote-based.	Free plan with 20 minutes of Zookeeper reasoning per month Paid tiers (Plus, Pro, Team, Enterprise) add more reasoning time, around 400 minutes a month on Plus and unlimited on Pro; their amounts are not shown on the public pricing page. Overages run pay-as-you-go at $0.0083 per second.
Free trial	Free tier, with a watermark on web exports	Free plan with full access to Zoo Design Studio and all core CAD workflows
Output	Interactive 3D scenes, published to the web or exported as GLTF, GLB, STL or USDZ	Parametric B-rep CAD models, exported as STEP, STL, glTF, OBJ, PLY or FBX
Languages	Not stated	Prompts primarily in English, with other major languages accepted at varying accuracy
Hosting	Not stated	Cloud; the desktop application needs an internet connection because the geometry engine runs in the cloud
Made in	Not stated	United States
What it makes	Interactive 3D scenes and 2D/3D interfaces for websites, apps and gamified experiences	Parametric B-rep CAD models from text prompts, images and sketches: primitives, brackets, mechanical parts, enclosures, mounts, assemblies and 3D-printable components
Detail and topology	Generated models carry more detail than hand-built ones, so a scene with several can slow down. Four engines to choose from: Hunyuan3D, Hunyuan 3.1 Pro, Trellis 2 and Meshy	Boundary-representation solids rather than meshes, editable through sketch and feature-tree workflows with human-readable KCL as the source of truth; assembly mates are still on the roadmap
Rigging and textures	Layer-based material system with a ready-made library, plus FBX import with animation and rig support	No rigging, no animation and no UV-mapped textures: the KCL standard library has no module for any of them. Surface appearance goes as far as setting a material colour on a solid
Speed	Two steps rather than one: a prompt returns a set of image previews, and the mesh is built from whichever preview is picked. The same image can be sent through a second engine without spending extra credits, and switching between the kept results is instant, so comparing costs less than regenerating. An estimated credit cost is shown before each run	No fixed generation time is published. Zoo states that Agent API requests, which is what Zookeeper runs on, have no fixed completion time and that the duration depends on the complexity of the task, the tools required and the number of iterations the agent performs; billing follows that, metered in reasoning minutes rather than per model
Export and pipeline fit	GLTF, GLB, STL and USDZ export, plus PNG and JPG images and MP4, WebM or image-sequence video. Publish as a public URL, a Spline Viewer embed, or code for React, Next.js, Webflow, Framer and Wix Studio, with native iOS and Android embeds	Exports STEP, STL, glTF, OBJ, PLY and FBX; imports KCL, STL, glTF/GLB, OBJ, FBX, PLY plus experimental STEP/STP and SLDPRT
Commercial use	Paid tiers	You own the outputs and may use them commercially. Material you put in is licensed back to Zoo to run and improve the service, including training its models, and opting out of that training is possible only on subscription tiers that allow it
API	For driving a scene, not for generating one. The Code API, built on the Spline Runtime, reads and writes scene variables, changes object properties, triggers transitions and listens for events from Vanilla.js, React and Next.js, with equivalents for SwiftUI and Kotlin. A separate Real-time API feature, configured in the editor, lets a published scene call an external endpoint. The desktop app bundles an MCP server that an AI client can call to build and edit scenes; the documentation describes no endpoint for generating a model outside the app	Yes, developer APIs for custom CAD applications; Zookeeper runs on the Agent API, billed pay-as-you-go at $0.0083 per second
MCP-ready	Yes	Yes
Deployment	Cloud (SaaS), Browser-based	Cloud (SaaS), Browser-based
Support	Community forum	more entries Email helpdesk, Community forum
Onboarding	Documentation and knowledge base, Video tutorials	Documentation and knowledge base, Video tutorials
Company size	Freelancers, Small and mid-sized, Enterprise	Freelancers, Small and mid-sized, Enterprise
Integrations	React, Next.js, Webflow, Framer, Wix Studio, Swift (iOS), Kotlin (Android)	Not stated

Compare more tools

Row where the values differ The small markers point at the lower number, the longer list or the stated feature. They describe the data, they are not a verdict.

The short version

Key Differences

Starting price Spline AI Free tier; Hobby from $15 / seat / month Zoo Design Studio Free plan with 20 minutes of Zookeeper reasoning per month
Free trial Spline AI Free tier, with a watermark on web exports Zoo Design Studio Free plan with full access to Zoo Design Studio and all core CAD workflows
Support Spline AI Community forum Zoo Design Studio Email helpdesk, Community forum
Output Spline AI Interactive 3D scenes, published to the web or exported as GLTF, GLB, STL or USDZ Zoo Design Studio Parametric B-rep CAD models, exported as STEP, STL, glTF, OBJ, PLY or FBX
What it makes Spline AI Interactive 3D scenes and 2D/3D interfaces for websites, apps and gamified experiences Zoo Design Studio Parametric B-rep CAD models from text prompts, images and sketches: primitives, brackets, mechanical parts, enclosures, mounts, assemblies and 3D-printable components

Every line is one datapoint from the table above, picked automatically. Nothing here is written text.

The trade-offs

Strengths and Limitations

Spline AI

Strengths

AI generation inside a full interactive 3D web editor, not a separate step
Publishes straight to the web, with code exports for React, Next.js, Webflow and Framer
Real-time collaboration on the same scene
Desktop app ships an MCP server, so an AI client can drive the open editor

Limitations

Web and design focused, not for high-poly game or film assets
Different workflow from pure generators
Free tier watermarks web exports
AI credits come only with a paid plan

Zoo Design Studio

Strengths

Output is editable parametric CAD rather than a mesh that has to be rebuilt
Free plan includes full CAD access plus 20 minutes of Zookeeper reasoning a month
Native applications for Mac, Windows and Linux
The Design Studio application is open source on GitHub
Zookeeper reads selections, renders and existing KCL as context instead of starting from a blank prompt

Limitations

Needs an internet connection: the geometry engine runs in the cloud
Paid tier amounts are not shown on the public pricing page
The geometry engine itself is not open source
Zoo may train on data from free plan usage
Assembly mates are not implemented yet

Plans

Pricing

Spline AI

Free $0 Per month. Limited personal files, unlimited file viewers, web exports with watermark.
Hobby $15 Per seat per month, or $12 billed yearly. Unlimited 3D and 2D files, no watermark on web exports.
Pro $30 Per seat per month, or $25 billed yearly. Unlimited folders and projects, video export, Apple and Android exports, unlimited variables, APIs and webhooks.
Max $70 Per seat per month, or $60 billed yearly. 10,000 AI credits per month, 5x more media generation per week.
Enterprise Custom Billed annually. Custom AI credits, centralized licensing and billing, team privacy, SAML single sign-on, priority support.

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Zoo Design Studio

Free Free Full access to Zoo Design Studio and all core CAD workflows, with 20 minutes of Zookeeper reasoning per month. Zoo may train on free plan usage data.
Plus Not stated Around 400 minutes of Zookeeper reasoning per month. No amount is published on the pricing page.
Pro Not stated Unlimited Zookeeper reasoning in Design Studio, with pay-as-you-go available. No amount is published on the pricing page.
Team Not stated Unlimited Zookeeper reasoning, with custom billing on request. No amount is published on the pricing page.
Enterprise Custom Contact sales. Adds design rules and internal company knowledge to Zookeeper, plus custom billing.

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What users say

Review Scores · opens after launch

Spline AI

Ease of use: Not rated yet
User interface: Not rated yet
Onboarding: Not rated yet
Support and service: Not rated yet
Value for money: Not rated yet
Features: Not rated yet

No reviews yet. Nothing has been published here yet, and no score is shown. How a review is checked before it appears is described below.

Zoo Design Studio

Ease of use: Not rated yet
User interface: Not rated yet
Onboarding: Not rated yet
Support and service: Not rated yet
Value for money: Not rated yet
Features: Not rated yet

No reviews yet. Nothing has been published here yet, and no score is shown. How a review is checked before it appears is described below.

How we check reviews

Before sending, the author has to confirm three things: that they have used the product themselves, that they work neither for the vendor nor for a competitor, and that nobody is paying them for the review. We also ask whether the vendor invited them to write it. That answer is required, either answer is accepted, and it stays with the review.

Every review is read by a person before it appears. An email address is required and is confirmed: we send a link to it, and a review does not reach us until the author opens that link, so a review has a sender who was reachable at least once rather than being anonymous. Where what somebody writes needs backing, we ask them for evidence that they used the product, and a review that does not get it is not published. We publish positive and negative reviews alike, we pay nothing and offer nothing for a review, and we accept none that was bought or incentivised.

What we cannot do is verify a purchase. There is no shop here and no account, so whether the author really used the tool rests on their own declaration, on whatever we ask them for, and on the plausibility of what they write. We say so rather than implying a check that does not exist.

A vendor cannot buy a review, and cannot have one removed or changed because they dislike it. We remove or edit a review only if it breaks our rules or the law, for example a false statement of fact. Paid placement has no effect on which reviews appear or on any score.

Read the full version on our methodology page

Where this comes from

Spline AI https://spline.design · no check date recorded yet

Zoo Design Studio https://zoo.dev · no check date recorded yet

This table lists factual criteria taken from information the vendors publish themselves. For how we put it together, see the methodology.