60 Alternatives to CAD Khana

Vibe Cading is a thing now. Describe a part, watch the LLM generate geometry, steer by eye until it looks right. 61 open source tools do exactly that, most built since MCP launched in late 2024.

The tools split on one question: who closes the feedback loop? In most, you do. You look at the render, describe what's wrong, the LLM tries again. In agent-driven tools, structured feedback returns to the LLM directly: scalar diagnostics, geometry properties, constraint violations. The agent corrects its own mistakes without you watching each iteration.

CAD Khana is our take on agent-driven vibe Cading. We chose code-CAD, where geometry is defined in code (Build123d, CadQuery, OpenSCAD), over wrapping a CAD application: diagnostics work cleaner directly against geometry, with no application object model in the way. JSON diagnostics (interference, clearance, wall thickness, overhangs) come back after every Build123d build, and renders happen on demand. Assertions in the script become build failures, not warnings, so the LLM fixes problems instead of working around them. Humans stay in the loop for taste and physical-world validation; correctness iteration happens in code.

Agent-driven

The LLM receives machine-readable feedback after each build and iterates without human review. Most wrap code-CAD libraries (CadQuery, Build123d, OpenSCAD) as MCP servers or Claude Code skills; a few add structured diagnostics on top of CAD applications like Onshape and AutoCAD.

Human-directed

You inspect the result and steer the next iteration. Two shapes of tool live here: extensions to existing CAD applications (FreeCAD, Blender, AutoCAD, SolidWorks, Fusion 360, Onshape, Rhino/Grasshopper, SketchUp) for users who already know them, and standalone code-CAD tools for users who don't.

Blender is mesh-based animation software, not precision CAD, but blender-mcp is the most-starred 3D-tool MCP by a wide margin and sets the reference point for MCP tooling at scale. CADAM is the outlier in the other direction: a text-to-CAD web app rather than a server or extension. McNeel ships RhinoMCP as a first-party server, still rare among CAD vendors.