OpenCASCADE
Fewer than 5 people recommend it so far, so there's no written verdict. Here is what commenters said.
4recommend
5warn against
Nov 20, 2025first mention
Oct 28, 2026latest mention
Why people recommend it
“take the good parts of occt”
“OpenCascade's (fickle but otherwise lovely) BREP modeling”
Show 2 more
Caveats and dissent
“it would leapfrog OpenCASCADE kernel for open-source CAD”
“which is both less sophisticated today and is slower to gain new features than Parasolid”
Show 1 more
“OpenCascade doesn't maintain any naming across its interfaces at all”
Often compared with
Threads where it came up
- Show HN: SolidCraft – Open-Source Parametric CAD in Rust (With MCP Support) 2 mentions
- ArtCraft Apps – open-source Adobe compatible suite written in Rust 2 mentions
- FreeCAD is an open-source parametric 3D modeler 2 mentions
- Blender 5.0 2 mentions
- Show HN: Nasscad – local-first 3D CAD for browser and Windows 1 mention
- Show HN: Popkern – open-source CAD kernel with G2 corner blends, browser IDE 1 mention
Also written as OpenCascade, Open CASCADE. Data: opencascade.json. Quotes are verbatim; the verdict and theme labels are written by a model from these comments, and every clause links to its sources.
All comments 18
Can't comment on the fillet/chamfers but for boolean operations I didn't find it to be a decade behind at all https://github.com/IfcOpenShell/IfcOpenShell/pull/9958
“results are cross-checked against OpenCASCADE wherever the two are comparable”
“to surpass OpenCASCADE”
“it would leapfrog OpenCASCADE kernel for open-source CAD”
“take the good parts of occt”
There is Truck - "Rust CAD Kernel" (https://github.com/ricosjp/truck) being developed by a Japanese CAE company, but not sure how full featured it is currently.
“No CAD kernels (Parasolid, OpenCascade, etc.): the math + code is the model.”
“most geometry kernels (see open cascade) sport things like "fuzzy boolean operations"”
“looks like open cascade, and a pretty good range of operations supported”
“OpenCASCADE is included as part of STEP importer though.”
“OpenCascade's (fickle but otherwise lovely) BREP modeling”
“which is both less sophisticated today and is slower to gain new features than Parasolid”
“with a OpenCASCADE geometry kernel”
“OpenCASCADE?”
“OpenCascade (WASM Worker) for B-Rep export”
“OpenCascade doesn't maintain any naming across its interfaces at all”
“then definetly use OpenCASCADE”
“improve on existing ones (OpenCASCADE?)”