DiffCAD, a FreeCAD workbench to review model changes like code
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I'd like to share a new workbench I've been working on called DiffCAD. Coming from a software engineering background, not having the ability to properly diff my CAD model changes was driving me crazy. This project scratches my own itch, and maybe someone elses', too!I'm open to feedback, ideas, and contributions. Cheers!
HN · launched May 7, 2026 · 7 upvotes (top 58%) · 0 views
Niche: computer-aided design software · 169 launches, 12 in the last 7 days ▼ -57% · Explore this niche →
Category and tags
- Manufacturing
- Dev tools
- Developer
- Not AI
- Hobby / open-source project
Visit website ↗ Source listing ↗
More like this: all 169 launches in computer-aided design software →
Could you build this?
Partial Building a FreeCAD workbench requires deep knowledge of CAD data structures, OpenCASCADE geometry kernel, and topological diffing algorithms that go beyond simple text diffs.
What it would actually take: A working system requires Python bindings for FreeCAD and OpenCASCADE (B-Rep data structures), implementing graph comparison for feature trees, and geometric boolean difference algorithms (computing volume overlaps and edge offsets). The primary challenge is topological naming problem resolution and accurately identifying semantic changes versus artifact shifts in parametric models. Building this requires solid expertise in computational geometry and CAD modeling internals.
Discussion
1 comment analyzed.
Competitors mentioned: freecad-build
Competitors
Other products that read as similar to this one : 159 launches clear the similarity bar, closest 8 shown.
Attention rank: #97 of 160 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 188 days after the earliest competitor.
- FreeCAD 1.1 · ph · 2026-03-30 · 218 upvotes · similarity 0.53
- caddiff · github · 2026-10-04 · 51 upvotes · similarity 0.53
- Aircad · hn · 2026-11-10 · 95 upvotes · similarity 0.51
- SimpleCAD · github · 2026-10-20 · 38 upvotes · similarity 0.51
- FluidCAD · hn · 2026-04-10 · 160 upvotes · similarity 0.49
- JermCAD · hn · 2025-11-05 · 5 upvotes · similarity 0.48
- enclose.dev · ph · 2026-10-12 · 2 upvotes · similarity 0.47
- We made Arcad, a parametric CAD in the browser, free and no signup · hn · 2026-08-02 · 6 upvotes · similarity 0.47
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