CounterSketch vs Kerf

CounterSketch is 3D custom jewelry design software for jewelers working with customers on designs in real time. Its library includes more than 3,000 customizable styles and components, and users can access over one million natural and lab-grown diamonds and gemstones in Stuller's inventory. Designs can display real-time prices using business-specific markups and photorealistic renderings. A built-in Freehand tool supports creating designs from scratch. Completed work can be sent to Stuller's CAD/CAM Services team for CAD verification, casting, and finishing. Users can open available designs from Stuller.com or Stuller Showcase directly in CounterSketch. It runs on Mac or Windows computers. The 15-day trial includes other functionality but limits the library to 25 styles and 21 Freehand parts. Membership includes technical support, Online Academy access, monthly library updates, quarterly virtual seminars, and software upgrades; one-on-one training is also offered. Listed US pricing includes a $349 a year membership, or one-time licenses at 2495.00 USD and 2995.00 USD with Rhinoceros 8. Both license options include a one-year membership.

Kerf is a free, open-source CAD workspace that runs on the user's own machine and supports work across 37 engineering domains. Users can describe design changes in plain language or use the Python kerf-sdk and JSON-RPC API. Mechanical design tools 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 outputs include STEP, STL, 3MF, IFC4, Gerber, PDF, DXF, BOM CSV, Touchstone, GDS-II, and firmware binaries. The site describes workflows for mechanical and electronics engineers, BIM architects, jewelry designers, and other engineering users. Kerf runs locally without accounts and keeps Git history for file revisions. Workshop content can be used offline once pinned. Installation options include source or Docker, with release archives listed for macOS arm64, macOS x64, and Linux x64; source installation 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.