SpeakCAD vs Zoo Text-to-CAD: engineering STEP files for developers, or print-ready parts for makers
Zoo's Text-to-CAD, now Zookeeper, a conversational CAD agent inside Zoo Design Studio, is one of the more serious attempts at generative CAD: a prompt produces a proper boundary-representation model with STEP export, a code language of its own (KCL), and an API for building products on top. It is aimed at engineers and developers. SpeakCAD is aimed at someone with a printer and a broken knob, and the differences follow from that.| Criterion | SpeakCAD | Zoo Text-to-CAD |
|---|---|---|
| Audience | Makers and 3D printer owners, no CAD skills assumed | Engineers and developers; API and desktop studio |
| Where it runs | Browser on any phone, tablet or computer; nothing to install | Zoo Design Studio for Mac, Windows and Linux, a browser version at app.zoo.dev with a desktop-style interface, and an API |
| Editing | Hand tools on a tapped face (hole, cut, add, extrude, text, rounded corners, filleted edges, shell, copies, measure), free; or chat: say what to change, with a ghost of the previous version | Point-and-click modelling tools, chat with Zookeeper, its CAD agent, or edit the KCL code |
| Inputs | Starters (box, plate, cylinder, tray) and hand tools on a tapped face; text, photos with a ruler to copy a part, STL/3MF/.scad uploads | Text; code in its own language (KCL) |
| Printability | Wall thickness, clearances, flat base and overhang rules applied by default | Not print-specific; an engineering model |
| Output | STL, 3MF, G-code sliced for your printer | STEP, STL, OBJ, glTF and more |
| Parametric | Yes, named OpenSCAD variables you can change by chat or in the dimensions panel | Yes, via its code language |
| Test the fit before a long print | Fit Check: free 5-minute test slice of the fit, then your printer's calibration is applied to every model | No: reprint, or cut a test piece yourself |
| Price | Maker $7.99/mo (50 credits); Pro $14.99/mo; Unlimited $79.99/mo | Free plan with 20 minutes of Zookeeper reasoning a month; Plus $20/mo; Pro $99/mo (check their site) |
Different jobs
Zoo wants to be the generative CAD engine that other products are built on, and the engineering desktop that produces STEP for manufacturing. That is a real and hard problem, and it is not the maker's problem. The maker's problem is: this shelf needs a bracket, my printer is in the garage, and I do not know CAD.
SpeakCAD is shaped by that problem. The interface is a chat that works on a phone. The model is parametric OpenSCAD, chosen because an AI writes it reliably and a browser compiles it in seconds. Fits, wall thicknesses and orientation are decided for you unless you say otherwise. The output is the STL or 3MF the slicer wants, or G-code already sliced for your printer. When the print does not fit, the fix is a sentence and a free re-download.
Where Zoo wins
If you need a STEP file for a machinist or for an assembly in SolidWorks or Fusion, or you are a developer building generative CAD into your own product, Zoo is the right tool and SpeakCAD does not try to be. Its B-rep output is what engineering workflows expect; a mesh from OpenSCAD is not. Its free plan also lets you generate your own parts every month, within the included reasoning time.
Where SpeakCAD wins
If the destination is a 3D printer: the parts come out print-ready, the editing loop is a conversation rather than code, it works from the phone in your pocket, it copies a physical part from two photos and a ruler, and it rebuilds an STL you downloaded so you can change it. It starts with Maker at $7.99 a month, cancel anytime, and G-code sliced for your printer costs the same as the STL.
The code question
Both tools produce code. Zoo's is its own language; SpeakCAD's is OpenSCAD, which has existed since 2010 and runs on any computer. In SpeakCAD the program stays in the editor: you change it by chat or by typing a dimension, and every design stays parametric in your project.