Popkern – open-source CAD kernel with G2 corner blends, browser IDE
An open-source CAD kernel where parts are code scripts, with real ISO threads and smooth fillets.
Popkern is an open-source, free boundary-representation CAD kernel where parts are short Rhai scripts instead of mouse-driven CAD history — bigger assemblies grow as folders of numbered migration scripts, git-friendly like database migrations. It already handles booleans, fillets and chamfers with genuinely curvature-continuous corners, sweeps, revolves, lofts, sketches with constraints and STEP import/export, and threads are modeled to ISO spec rather than a texture. It's written by AI agents under human direction, with every change checked against thousands of automated tests and cross-referenced against OpenCASCADE, and it declines an operation rather than returning a broken solid.
What holds up
- +AGPL-3.0 for the kernel, but an exception keeps your scripts, models and STEP files fully yours.
- +Every change is checked against thousands of automated tests and cross-checked against OpenCASCADE.
- +Threads and gears are modeled to real ISO/involute geometry, not applied as a surface texture.
- +Declines an operation it can't complete rather than silently handing back a broken solid.
Mind the limits
- −Early-stage: the launch post is explicit that plenty of CAD functionality still doesn't work yet.
- −Built by AI agents under human direction — a different trust model than a kernel written by hand.
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