ScratchCAD is listed as Open Source. Check https://github.com/scratchcad/scratchcad for the current plan limits, as vendors change pricing frequently.

What is ScratchCAD best for?

ScratchCAD is commonly used for Parametric CAD, Text-to-CAD via MCP, 3D model export. It supports English.

ScratchCAD

Q: What is ScratchCAD?

ScratchCAD is a code AI tool listed on Use AI Tools. ScratchCAD is AI-driven parametric CAD. A Rust solid modelling API built on the OpenCASCADE kernel is paired with a local MCP server and an editor, so an AI assistant can build parts from Rhai scripts that produce exact B-rep solids and export to STEP, IGES, BREP, STL, OBJ and 3MF. It runs under Docker Compose, and the README warns that it is under active development.

Code⚡ Advanced✅ Global access

Parametric CADText-to-CAD via MCP3D model export

Open SourceEnglish

ScratchCAD is AI-driven parametric CAD. A Rust solid modelling API built on the OpenCASCADE kernel is paired with a local MCP server and an editor, so an AI assistant can build parts from Rhai scripts that produce exact B-rep solids and export to STEP, IGES, BREP, STL, OBJ and 3MF. It runs under Docker Compose, and the README warns that it is under active development.

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🎯 Real-World Use Cases

Let an agent build a part

A local MCP server exposes the modelling API to an AI assistant.

Keep geometry exact

Parts are B-rep solids rather than meshes, and export to standard CAD formats.

Run it locally

The server, MCP server and editor come up under Docker Compose.

⚖️ Honest Review

✅ Pros

+Apache-2.0 and built on OpenCASCADE
+Exports to STEP, IGES, BREP, STL, OBJ and 3MF
+Local MCP server rather than a hosted service

⚠️ Cons

−Under active development; the API can break between commits
−The first Docker build takes a while

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CodeOct 25, 2026