Kerf review
A technical, open-source jewelry CAD system with modeling, rendering, and manufacturing export.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Kerf is a free, MIT-licensed CAD system for designers, engineers, makers, and jewelry professionals who want an open-source technical workflow. Its jewelry-specific tools cover rings, gemstones, gem seats, settings, and chains, while parametric sketching and feature-tree modeling support more structured design work. Ring sizing, stone-setting tools, physically based rendering, and manufacturing export give it a practical path from concept to production preparation.
The published product details show a free model with no account or subscription requirement. Kerf runs across web, macOS, Linux, API, and self-hosted environments, giving teams flexibility over where the workflow lives. Its ecosystem includes JSCAD, OpenCascade, OpenCAMlib, GitHub, CalculiX, and FEniCSx. Local revisions, Git history, and Workshop publishing also suit makers who want versioned design files or a collaborative publishing workflow. Export support includes STEP, STL, and 3MF, while the category specifications also identify DXF and G-code support.
Kerf’s breadth is both its main advantage and its clearest trade-off. Alongside jewelry tools, it combines rendering, casting export, manufacturing preparation, and chat-driven editing through an LLM tool layer. The gem catalog includes more than 30 gemstone cuts and templates, adding useful structure for stone-focused designs. However, its broader engineering orientation may demand more setup than a dedicated jewelry suite. Choose Kerf if open-source ownership, parametric control, integrations, and manufacturing workflows matter most. A jewelry maker seeking a narrower, simpler tool focused only on jewelry production may prefer a dedicated alternative.
Kerf pros and cons
- Where it wins
- Free, MIT-licensed CAD with local and self-hosted workflows
- Jewelry modules cover rings, settings, gemstones, chains, and gem seats
- Exports STEP, STL, and 3MF for manufacturing preparation
- Where it doesn't
- Its hybrid engineering focus may require more setup than jewelry-only suites
- The workflow spans many technical tools beyond dedicated jewelry design
- Chat-driven editing operates through an LLM tool layer
Kerf fact sheet, pricing and score →
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