SpeakCAD vs OpenSCAD: code CAD without writing the code
SpeakCAD is built on the same foundations as OpenSCAD: solid CSG geometry compiled to a manifold mesh. The difference is who writes the program. In OpenSCAD you do; in SpeakCAD you describe the part and the AI writes, compiles and iterates on the code for you.| Criterion | SpeakCAD | OpenSCAD |
|---|---|---|
| Input | Plain-English chat, photos, STL/3MF/.scad uploads | OpenSCAD code you write |
| Learning curve | None: describe and refine | Programming language, transforms, booleans |
| Install | None: runs entirely in the browser | Desktop download for Windows, macOS or Linux |
| On a phone | Full editor in Safari or Chrome on iPhone and Android | No: desktop only |
| Rendering | In the browser: a new part in about a minute, edits in seconds, live preview | Desktop app, F6 render can take minutes |
| Output | STL, 3MF (manifold), G-code sliced for 380+ printers | STL, 3MF, AMF, OFF, others |
| Parametric | Yes: every dimension is a variable | Yes |
| Libraries (BOSL2, MCAD) | No: the AI writes helpers itself | Yes |
| Access the code | No: the program stays in the editor; change it by chat or by typing a dimension | Yes, it is the whole workflow |
| 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, open source |
Same engine, different interface
OpenSCAD is loved because a model is a text file: precise, versionable, parametric. Its weakness is that every fillet, every hole pattern and every tolerance is a line of code you have to know how to write. SpeakCAD keeps the strengths and removes the typing. The AI writes idiomatic OpenSCAD with named parameters, and your browser compiles it with the modern Manifold backend. The first render usually appears within a minute or two: a new part gets deeper reasoning through the geometry, and small edits land in seconds.
When OpenSCAD is the better choice
If you already think in code, need external libraries such as BOSL2, or maintain large parametric projects with many files, the desktop tool is unbeatable and free. SpeakCAD keeps its program inside the editor, so if you want the code itself in hand, write it in OpenSCAD.
When SpeakCAD is the better choice
If you want a part today and do not want to learn a language, or you know OpenSCAD but do not want to spend an evening on a knob, describing the part is faster. Upload your existing .scad file and the AI edits it for you as well.