Stairstep

Stairstep views STEP files. Open a model and inspect it in 3D — orbit, pan, and zoom, with a reference grid and a scale bar to keep track of size. On macOS, Stairstep also provides Quick Look previews and Finder thumbnails, so you can peek at a STEP file without opening the app.

Drag to orbit the model and scroll or pinch to zoom; the scale bar updates to match. The toolbar fits the model back into view and reveals an inspector that reports the geometry — vertices, triangles, materials, and overall dimensions.

iPad

The same viewer runs on iPad, filling the screen and responding to touch. Drag one finger to orbit, pinch to zoom, and drag two fingers to pan.

iPhone

It fits on iPhone, too. The model fills the screen edge to edge, and the inspector with the file's details is a tap away.

Support

Please discuss and register issues on GitHub.