Partwright is a browser-based parametric CAD tool. You write JavaScript (using the manifold-3d API) or OpenSCAD code that constructs 3D geometry, and the result renders live. There is no backend, no installs, and no signup.

How do AI agents use Partwright?

Partwright exposes a window.partwright console API that lets agents create sessions, run code, validate geometry with assertions, save versions, paint color regions, and export files — all programmatically, with no clicks. Geometry stats are also published as JSON in a #geometry-data DOM element for verification.

Yes. Partwright is free for non-commercial use, source-available, and runs entirely in your browser. There is no account and no quota. Your models never leave your browser; the site collects only anonymous, aggregate usage analytics.

Partwright exports GLB, STL, OBJ, and 3MF. GLB and 3MF carry per-region colors painted in the editor, so they are ready for multi-material 3D printing.

Which 3D engine does it use?

Partwright uses manifold-3d (compiled to WebAssembly) for boolean operations, Three.js for rendering, and CodeMirror for the code editor. OpenSCAD code is executed via openscad-wasm.

Partwright Beta

Open editor →

New Voxels, BREP solids & image relief →

Describe something.
Get a printable model.

A browser-native parametric CAD studio with a programmatic API built for AI agents. Write JavaScript or OpenSCAD, watch it render live, export print-ready GLB / STL / OBJ / 3MF. No signup, no installs.

Open the editor Take the guided tour Try with an AI agent →

0 installs 4 engines 100% in-browser GLB · STL · 3MF export

partwright · mounting-bracket

                // parametric bracket

                const { Manifold } = api;

                const base = Manifold.cube([40,30,4], true);

                const wall = Manifold.cube([40,4,24])

                  .translate([0,13,12]);

                const bore = Manifold.cylinder(10,4,4,48);

                return base.add(wall)

                  .subtract(bore.translate([0,0,4]));

Ready · 1 component

How it works

01

Write or prompt

Type code in the editor, or let an AI agent drive it. Both engines (manifold-js, OpenSCAD) work the same way.

02

Render live

Geometry compiles in WebAssembly and renders in a Three.js viewport with cross-sections and on-demand multi-angle snapshots.

03

Verify & export

Sessions track every iteration with thumbnails and stats. Export GLB, STL, OBJ, or 3MF when ready.

What you can build

Browse the full catalog →

Built for AI agents

Hand the keyboard to your agent.

Most CAD tools assume a human at the mouse. Partwright is built around a programmatic API so an agent can model, verify, iterate, and hand you a gallery for review — no clicks required.

→window.partwright console API for sessions, runs, validation, exports
→Geometry stats published as JSON in #geometry-data for verification
→Headless renderViews/renderView API for all-angle visual verification
→Session notes record [REQUIREMENT], [DECISION], [FEEDBACK] for resume

Read the agent instructions →

Try this prompt with Claude / ChatGPT

Read the AI agent instructions at https://www.partwrightstudio.com/ai.md to understand how to use this tool.

Then navigate to https://www.partwrightstudio.com/editor and use the window.partwright console API to:

1. Create a session called "Standard Lego Brick"
2. Build a standard 2x4 Lego brick (approximately 31.8mm x 15.8mm x 11.4mm with studs on top and hollow underside with tubes)
3. Save each major step as a version (e.g. v1 - base block, v2 - add studs, v3 - hollow underside with tubes)
4. Use assertions to verify each version is a valid manifold with maxComponents: 1
5. Give me a share link (partwright.getShareLink()) when done so I can open the design

Your recent sessions

Built on open foundations

manifold-3d Three.js CodeMirror OpenSCAD WASM Cloudflare Pages

No backend, no accounts, and only privacy-first anonymous analytics. Everything you make runs and stays in your browser, and you can verify the source on GitHub.

Describe something.Get a printable model.

Write or prompt

Render live

Verify & export

Hand the keyboard to your agent.

Describe something.
Get a printable model.