Meshdiff diffs 3D models in the browser, with no file upload

Meshdiff is a web tool for comparing two versions of an STL file — the standard mesh format used for 3D printing and CAD exports — and highlighting the geometric differences between them visually. The entire comparison runs client-side, meaning the models are processed locally in the browser rather than sent to a remote server.

The niche it targets is a real gap: text and code have mature diffing tools, but binary 3D meshes are awkward to compare, and designers iterating on a part often have no good way to see exactly what changed between revisions. A dedicated visual diff makes that iteration legible. The client-side design is the other selling point — because files never leave the user’s machine, there’s no exposure of potentially proprietary designs and no backend infrastructure to run, which also sidesteps upload-size limits.

Beyond the tool’s own description, concrete details are thin — this is a Show-HN-style launch of a single-purpose utility rather than a documented product — so specifics like the diff algorithm, supported file sizes, and licensing aren’t established here.