Design and diagrams

ThreadCam alternatives

2 open-source projects that already do this job. Free to use - not free to run, which is what the numbers on the right are for.

The full assessment →

The projects

jscad/OpenJSCAD.org3,223MITBrowser and command-line tools for creating parametric 2D and 3D models with JavaScript.Open on GitHub xiangechen/chili3d4,722AGPL-3.0Browser-based 3D CAD application for online model design and editing.Open on GitHub

What you give up either way

Proprietary, polished mobile UX and native iOS performance
The vendor's premium garment library and pre-built templates
Built-in AI credit system and in-app purchase flow
App Store distribution, push notifications, and native device integrations
Ongoing editor polish and platform-specific bug fixes

An open-source project doing the core job proves a replacement is possible. It does not prove it matches ThreadCam, and it does not prove anyone has run it for a month. How we decide.