Code-first parametric CAD for JavaScript/TypeScript, in the browser and CLI.
ForgeCAD is a multi-backend CAD system with a JavaScript/TypeScript modeling API, live parameters, constraints, assemblies, reports, and exact STEP/BREP export. Interactive browser modeling currently uses Manifold for fast geometry work, while exact export runs through CadQuery/OpenCascade and the public modeling layer stays backend-aware rather than tied to one kernel.
TypeScript is the file format. The browser is the CAD system.
Try it live → • Docs • Examples
npm install -g forgecad
forgecad studio /path/to/your/projectOr start from a blank scratch file:
forgecad studio --blankThis is ForgeCAD's community home — the place to file issues, follow development, explore benchmarks, and find examples and documentation.
Active development happens in a private repository so we can move fast and iterate freely. As the project matures, we plan to progressively open-source more components of the codebase here. If you have something specific you'd like to see opened up, open an issue — community input directly shapes what we prioritize.
- Issues & discussions — bug reports, feature requests, and questions (open an issue)
- LLM benchmarks — how well do different models handle code-first CAD?
- Examples — ready-to-run
.forge.jsscripts you can learn from and adapt - Documentation — available at forgecad.io/docs
Drop this into a .forge.js file:
const width = param("Width", 120, { min: 60, max: 220, unit: "mm" });
const depth = param("Depth", 80, { min: 40, max: 160, unit: "mm" });
const height = param("Height", 12, { min: 6, max: 40, unit: "mm" });
const base = roundedRect(width, depth, 10).extrude(height).color("#5f87c6");
const pocket = roundedRect(width - 24, depth - 24, 8)
.extrude(height - 3)
.translate(12, 12, 3);
const part = base.subtract(pocket);
dim([0, 0, 0], [width, 0, 0], { label: "Width" });
dim([0, 0, 0], [0, depth, 0], { label: "Depth", offset: 14 });
cutPlane("Center Section", [1, 0, 0], width / 2);
return part;The Forge API is globally available inside scripts — no imports required. param(...) values become live sliders in the UI.
ForgeCAD is built to work cleanly with coding agents. Your CAD models are plain code, and the repository includes the context agents need to be productive immediately:
- Full API docs explain the modeling API and workflows
examples/api/provides concrete model patterns to copy and adapt- Browser + CLI run the same engine, so AI-generated scripts behave consistently
Install a self-contained ForgeCAD skill for coding agents:
forgecad skill install # model-authoring docs
forgecad skill install --dev # + internals and coding conventionsGenerate a single context file with all ForgeCAD API docs for any chat session:
forgecad skill one-file ~/Desktop/forgecad-context.mdLatest benchmark iterations from ForgeCADBenchmark/results/* (version_{n}.forge.js with highest n per run folder).
| model name | prompt | GIF |
|---|---|---|
3dprinter-gpt52codex2026-02-13 14-36-06 • v2 |
Make a detailed home 3D printer, showing the internal details of how it should work. Add some params for controlling positions, etc. |  |
amazon-nova-2-lite-v12026-02-13 00-15-44 • v1 |
Make a home AC unit, showing both pieces on different sides of the wall (inside and outside). The external piece should have a fan positioned on its external face vertically. Implement whatever features/methods you are missing in the script itself for your convenience. Use the simpler primitives when unsure. |  |
amazon-nova-premier-v12026-02-13 00-36-50 • v1 |
Make a home AC unit, showing both pieces on different sides of the wall (inside and outside). The external piece should have a fan positioned on its external face vertically. Implement whatever features/methods you are missing in the script itself for your convenience. Use the simpler primitives when unsure. | GIF generation failed (script runtime error). |
aurora_alpha2026-02-12 15-19-30 • v2 |
Make a home AC unit, showing both pieces on different sides of the wall (inside and outside). Implement whatever features/methods you are missing in the script itself for your convenience. Use the simpler primitives when unsure. | GIF generation failed (script runtime error). |
bytedance-seed-seed-1.62026-02-13 00-14-02 • v3 |
Make a home AC unit, showing both pieces on different sides of the wall (inside and outside). The external piece should have a fan positioned on its external face vertically. Implement whatever features/methods you are missing in the script itself for your convenience. Use the simpler primitives when unsure. |  |
deepseek-deepseek-v3.22026-02-13 00-30-04 • v3 |
Make a home AC unit, showing both pieces on different sides of the wall (inside and outside). The external piece should have a fan positioned on its external face vertically. Implement whatever features/methods you are missing in the script itself for your convenience. Use the simpler primitives when unsure. |  |
gemini3flash2026-02-12 23-53-27 • v5 |
Make a home AC unit, showing both pieces on different sides of the wall (inside and outside). The external piece should have a fan positioned on its external face vertically. Implement whatever features/methods you are missing in the script itself for your convenience. Use the simpler primitives when unsure. |  |
glm52026-02-12 14-58-52 • v3 |
Make a home AC unit, showing both pieces on different sides of the wall (inside and outside). Implement whatever features/methods you are missing in the script itself for your convenience. Use the simpler primitives when unsure. |  |
glm52026-02-12 23-04-12 • v4 |
Make a home AC unit, showing both pieces on different sides of the wall (inside and outside). The external piece should have a fan positioned on its external face vertically. Implement whatever features/methods you are missing in the script itself for your convenience. Use the simpler primitives when unsure. |  |
google-gemini-3-pro-preview2026-02-13 00-36-12 • v2 |
Make a home AC unit, showing both pieces on different sides of the wall (inside and outside). The external piece should have a fan positioned on its external face vertically. Implement whatever features/methods you are missing in the script itself for your convenience. Use the simpler primitives when unsure. |  |
gpt52codex2026-02-13 00-04-30 • v2 |
Make a home AC unit, showing both pieces on different sides of the wall (inside and outside). The external piece should have a fan positioned on its external face vertically. Implement whatever features/methods you are missing in the script itself for your convenience. Use the simpler primitives when unsure. |  |
gpt52codex2026-02-13 12-40-31 • v2 |
Make a home AC unit, showing both pieces on different sides of the wall (inside and outside). The external piece should have a fan positioned on its external face vertically. Include as many details as you safely can. Implement whatever features/methods you are missing in the script itself for your convenience. Use the simpler primitives when unsure. |  |
haiku_4_52026-02-12 21-49-51 • v1 |
Make a home AC unit, showing both pieces on different sides of the wall (inside and outside). Implement whatever features/methods you are missing in the script itself for your convenience. Use the simpler primitives when unsure. |  |
haiku_4_52026-02-12 21-54-22 • v3 |
Make a home AC unit, showing both pieces on different sides of the wall (inside and outside). Implement whatever features/methods you are missing in the script itself for your convenience. Use the simpler primitives when unsure. |  |
kimi252026-02-12 13-50-22 • v4 |
Make a home AC unit, showing both pieces on different sides of the wall (inside and outside). Implement whatever features/methods you are missing in the script itself for your convenience. Use the simpler primitives when unsure. |  |
kimi252026-02-12 14-58-53 • v3 |
Make a home AC unit, showing both pieces on different sides of the wall (inside and outside). Implement whatever features/methods you are missing in the script itself for your convenience. Use the simpler primitives when unsure. |  |
manual-gemini-flash2026-02-12 23-44-23 • v3 |
Make a home AC unit, showing both pieces on different sides of the wall (inside and outside). The external piece should have a fan positioned on its external face vertically. Implement whatever features/methods you are missing in the script itself for your convenience. Use the simpler primitives when unsure. |  |
minimax252026-02-12 14-32-24 • v5 |
Make a home AC unit, showing both pieces on different sides of the wall (inside and outside). Implement whatever features/methods you are missing in the script itself for your convenience. Use the simpler primitives when unsure. |  |
minimax252026-02-12 23-05-17 • v3 |
Make a home AC unit, showing both pieces on different sides of the wall (inside and outside). The external piece should have a fan positioned on its external face vertically. Implement whatever features/methods you are missing in the script itself for your convenience. Use the simpler primitives when unsure. |  |
minimax252026-02-13 12-37-52 • v4 |
Make a home AC unit, showing both pieces on different sides of the wall (inside and outside). The external piece should have a fan positioned on its external face vertically. Implement whatever features/methods you are missing in the script itself for your convenience. Use the simpler primitives when unsure. |  |
openai-gpt-oss-120b2026-02-13 00-38-15 • v1 |
Make a home AC unit, showing both pieces on different sides of the wall (inside and outside). The external piece should have a fan positioned on its external face vertically. Implement whatever features/methods you are missing in the script itself for your convenience. Use the simpler primitives when unsure. |  |
opus_4_62026-02-13 11-47-54 • v5 |
Make a home AC unit, showing both pieces on different sides of the wall (inside and outside). The external piece should have a fan positioned on its external face vertically. Implement whatever features/methods you are missing in the script itself for your convenience. Use the simpler primitives when unsure. |  |
prime-intellect-intellect-32026-02-13 00-31-28 • v1 |
Make a home AC unit, showing both pieces on different sides of the wall (inside and outside). The external piece should have a fan positioned on its external face vertically. Implement whatever features/methods you are missing in the script itself for your convenience. Use the simpler primitives when unsure. |  |
qwen3.5-397b-a17b2026-02-16 14-29-22 • v3 |
Make a home AC unit, showing both pieces on different sides of the wall (inside and outside). The external piece should have a fan positioned on its external face vertically. Implement whatever features/methods you are missing in the script itself for your convenience. Use the simpler primitives when unsure. |  |
qwen3maxthinking2026-02-12 23-16-41 • v2 |
Make a home AC unit, showing both pieces on different sides of the wall (inside and outside). The external piece should have a fan positioned on its external face vertically. Implement whatever features/methods you are missing in the script itself for your convenience. Use the simpler primitives when unsure. |  |
robot-hand-gpt52codex2026-02-14 00-51-41 • v1 |
Make a fully functional robot hand. Should be easy to build, maybe even at home with some good tools. Show all the mechanics. Should be able to hold arbitrary shape objects. Don't be a perfectionist, but be an artist and an engineer. As this is a complex task, break it down to simpler ones, solve them, combine, iterate. |  |
sonnet_4_52026-02-12 21-58-26 • v3 |
Make a home AC unit, showing both pieces on different sides of the wall (inside and outside). Implement whatever features/methods you are missing in the script itself for your convenience. Use the simpler primitives when unsure. |  |
x-ai-grok-4.1-fast2026-02-13 00-26-36 • v2 |
Make a home AC unit, showing both pieces on different sides of the wall (inside and outside). The external piece should have a fan positioned on its external face vertically. Implement whatever features/methods you are missing in the script itself for your convenience. Use the simpler primitives when unsure. |  |
- Browser CAD IDE with Monaco editor + real-time 3D viewport
- 2D sketch API: primitives, path builder, booleans, transforms, offsets, constraints
- 3D API: booleans, transforms, hull, level set/SDF workflows, cut planes
- Named shapes, face/edge references, fillet/chamfer helpers
- Reusable part library with fasteners, tubes, brackets, threads, patterns, exploded-view helpers
- Assembly graph API with revolute/prismatic/fixed joints and joint couplings
- Drawing/report pipeline: dimensions, BOM, multi-view PDF generation
- CLI tools that run the same engine as the browser runtime
| Task | Command |
|---|---|
| Validate a script | forgecad run file.forge.js |
| Render PNG views | forgecad render file.forge.js |
| Render orbit GIF | forgecad capture gif file.forge.js |
| Export sketch SVG | forgecad export svg file.forge.js |
| Export exact STEP | forgecad export step file.forge.js |
| Generate report PDF | forgecad export report file.forge.js |
| Parameter robustness scan | forgecad check params file.forge.js --samples 10 |
Full documentation is available at forgecad.io/docs.
Business Source License 1.1 — free for non-production use. Converts to MIT on the change date. See LICENSE for details.