MeasurefromSTL - Online measurement tool - Open source

Shaft Gauge - a free browser tool to measure STL files (mm)

I built a small, single-file web tool for quickly reading dimensions off an STL mesh, handy when you just need a measurement without opening full CAD (with claude AI).

Drag in an STL and you get:
- Diameter and length (auto shaft-axis detection) plus full bounding-box dimensions
- Point-to-point distance with vertex snapping
- 3-point circle fit to read a bore/round feature diameter (works on tilted planes)
- 2D cross-sections on the XY / XZ / YZ planes with a movable slider
- Volume, triangle count, light/dark theme

No install, no sign-up, and your file never leaves your device - everything runs locally in the browser (binary and ASCII STL). Open source (MIT).

Live demo: emresensoy.github.io/MeasureFromSTL/
Source: github.com/emresensoy/MeasureFromSTL

Feedback and feature ideas welcome.

Nice project. Local no-upload measure tools are exactly what shop-floor PCs need. For anyone who also gets STEP from the designer (better than STL for holes and radii), FreeCAD and CAD Assistant measure BREP cleanly; browser viewers help when you cannot install on a locked PC.

Disclosure: I'm Ethan Tan, CADProps developer. We built browser measure tools as well, e.g. CAD dimensions: www.cadprops.com/tools/cad-dimensions/ (92 extensions). Native CATIA/NX/Inventor/SolidWorks files are converted on CADProps servers. Use a local kernel for NDA parts.