Kerf
Kerf is a free, open-source CAD workspace that runs on a user's own machine and supports work across 37 engineering domains. Users can request design changes in plain language or use the Python kerf-sdk and JSON-RPC API to script the same tool surface. Mechanical design features include constraint-based sketching, parametric feature history, validated B-rep geometry, drawings, and persistent face references. The workspace also includes FEM analysis, topology optimization, SPICE and RF analysis, CAM toolpaths, and G-code output. Listed file outputs span STEP, STL, 3MF, IFC4, Gerber, G-code, PDF, DXF, BOM CSV, Touchstone, GDS-II, and firmware binaries. Kerf describes workflows for mechanical and electronics engineers, BIM architects, jewelry designers, and other engineering users. It runs locally without accounts and keeps Git history for file revisions. Workshop content can be used offline after it is pinned. Installation options include source or Docker, with release archives for macOS arm64, macOS x64, and Linux x64; source setup requires Python 3.11 or later. The chat workflow can use a bring-your-own LLM; no bundled model or paid hosted plan is listed.
Who it is for
Kerf is aimed at engineers, BIM architects, jewelry designers, and others with CAD workflows. It suits users comfortable running local software and supplying their own LLM for chat-based work.
What is good
- Free, open-source, and runs locally
- Supports plain-language requests and scripting
- Includes simulation and manufacturing tools
- Keeps local Git history for file revisions
- Workshop content can work offline when pinned
What to know first
- Chat workflow may require a bring-your-own LLM
- Source installation requires Python 3.11 or later
- No bundled model or paid hosted plan is listed
Verdict
Kerf combines CAD, analysis, and manufacturing tools in a local workspace, with both chat and scripting workflows. Consider its installation requirements and the need to bring an LLM for chat use.
Kerf plans and pricing
All plansCompared on jewelry design software
- Free plan
- Yes
- Parametric modeling
- Yes
- Ring sizing tools
- Yes
- Stone setting tools
- Yes
- Photorealistic rendering
- Yes
- Manufacturing export
- Yes
- Supported platforms
- hybrid
- File export formats
- STEP, STL, 3MF, DXF, G-code
