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Polykrom

Polykrom is an open-source parametric 3D CAD application written in pure Rust. Sketch on a plane, constrain and dimension the sketch, turn profiles into solids with features on a timeline, and change a parameter to watch the whole timeline rebuild.

It runs as:

  • a desktop app for Windows and Linux (egui + wgpu);
  • a web app in the browser (wasm, WebGPU or WebGL2), try it here;
  • a headless CLI, solidcraft-cli, that runs command scripts, measures and exports;
  • an MCP server that AI agents model with, headless or driving the running app.

Everything the user can do is a command with JSON parameters. The toolbar, the dialogs, scripts, the CLI, the control channel and MCP all run the same commands, so anything you can click you can also script, test or hand to an agent.

Polykrom is early. Sketching, solid modelling, parameters, components with joints, sheet metal and a plastic-enclosure subset work; surfaces, drawings, CAM and simulation are deferred. The roadmap has the details, and the feature list lists every command by area, and the reference tests check modelling results against analytic and FreeCAD values.

Existing .solidcraft designs and solidcraft-cli commands keep their names and behavior.

This book has two halves: the user guide for people modelling with Polykrom, and the developer guide for people working on it. The command reference is generated from the code on every build.

Polykrom is licensed MIT OR Apache-2.0. It is independent: behaviour is designed from public documentation, general CAD conventions and user feedback, and reference tests use analytic values and open-source tools. Polykrom is not affiliated with Autodesk, Dassault Systèmes, PTC or any other CAD vendor; product names such as Fusion, SolidWorks and Onshape are trademarks of their respective owners, named only to describe compatibility.