LuaCAD: Parametric CAD software scripted in Lua with CSG operators

What it does

LuaCAD is a parametric CAD tool that lets users write 3D models as Lua scripts instead of using OpenSCAD's SCAD language. It provides operator overloading for constructive solid geometry (CSG) operations, so shapes can be combined with natural syntax like a + b for union, a - b for subtraction, and a * b for intersection. The software ships as both a CLI tool and a desktop app called luacad-studio. Models export to 3MF, STL, OBJ, PLY, OFF, AMF, or SCAD formats, and can also render directly to PNG images. It can open and evaluate existing OpenSCAD files without requiring OpenSCAD to be installed.

Who it is for

LuaCAD targets users who want to script 3D models programmatically but find OpenSCAD's language limiting. The tool appeals to designers, engineers, and makers working with parametric modeling. The browser-based playground with WebAssembly support lets people experiment without installation, lowering the barrier to trying the software.

Pricing

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How it stands out

The core differentiator is swapping SCAD for Lua 5.4. Lua offers operator overloading (enabling intuitive CSG syntax), better consistency, higher performance, and more powerful language features than SCAD. The desktop editor shows live 3D updates as users type, displaying the CSG tree before mesh generation. The CLI is comprehensive, supporting watch-mode rebuilds, PNG rendering, linting, and optional raytracing with soft shadows. LuaCAD uses Manifold for mesh generation or can delegate to OpenSCAD. Installation is straightforward via Homebrew, crates.io, or source.

What a founder should check

First, verify OpenSCAD's actual market size and how many users face genuine pain with SCAD syntax. LuaCAD may solve a real problem for a small audience, but the addressable market matters. Second, examine switching costs: users with large existing SCAD codebases, invested toolchains, or team workflows built around OpenSCAD face friction migrating to Lua. Third, understand the moat. Lua adoption alone may not be defensible if OpenSCAD addressed its language design or if competitors added scripting in Python or JavaScript. The free, open-source positioning helps adoption but limits revenue models and creates vulnerability to forked versions.

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