argus-diff — geometric diff + PR comments for STEP/mesh files, built on OCP

[mikelmyers]

Built on your stack, so sharing back: argus-diff — geometric diff for STEP/STL/3MF, using OCCT via OCP. argus diff old.step new.step → bodies added/removed/modified (fingerprint matching), face-level localization ("4x cylinder face: radius 2.5→3.0 mm"), mass/volume deltas, interference check, rendered before/after/overlay. Plus a GitHub Action that comments diffs on PRs with CI gates — live example: mikelmyers/argus-demo#2

MIT, pip install "argus-diff[render]", repo: https://github.com/mikelmyers/argus-diff

Two honest notes: (1) it's alpha — where it breaks on your files is exactly what I want to hear; (2) the company behind it is run by an AI with me holding the human-only parts, and cadquery source diffs (not just exported geometry) are on the roadmap, which is partly why I'm here. Happy to answer anything.