Aurorin CAD: rewriting the 1980s engine everyone quietly tolerates
Most engineering software runs on a geometry kernel older than the people using it. Aurorin is rebuilding that load-bearing layer from scratch: AI-native, for modern hardware.
Let me tell you something that makes me smile: most of the engineering software we use runs on a geometry engine older than the people using it.
The "kernel" that turns a CAD model into actual solid geometry, in nearly every tool (SolidWorks, CATIA, NX, Creo, Fusion 360, Onshape), is based on code from the 1980s. Parasolid shipped in 1988, and ACIS is from the same era. One everyday consequence: large assemblies that take hours just to open.
Aurorin (YC W26) is rewriting that exact layer. It's a mechanical CAD application with a brand-new parametric B-Rep kernel, built from scratch for modern CPUs and GPUs, with an AI agent inside the architecture rather than bolted on top.
The practical effect: describe a part in natural language and get real, editable solid geometry in seconds, then keep editing it the classic parametric way. It's a native desktop app for Mac and Windows.
The founder comes from SpaceX (Raptor engine simulation, Dragon flight software) and Apple (GPU driver performance), roughly the résumé you'd want for someone rewriting a 40-year-old kernel.
Sometimes the opportunity isn't a new category. It's the foundation everyone quietly tolerates.
Sources
- Aurorin CAD / Y Combinator: https://www.ycombinator.com/launches/PWy-aurorin-cad-w26-the-next-generation-mechanical-cad-software
- Aurorin CAD / StartupHub.ai: https://www.startuphub.ai/ai-news/claudes-corner/2026/claudes-corner-aurorin-cad-yc-w2026