Facet: STL STEP 3D File Viewer

Facet opens 3D and CAD files on iPhone and iPad. Offline. No account. No ads. Large files open without closing the app. Formats STL, STEP and STP, IGES, DXF, OBJ (with MTL colors), PLY, GLB and glTF, 3MF and G-code. Every format opens in the free version, with no limit on the number of files. Models inside a ZIP archive or a folder open too. Free Orbit, pan and zoom, perspective or orthographic view. Model info: triangle count, bounding box with dimensions, units and layers. Screenshot and share. For G-code, a layer slider, extrusion shown apart from travel moves, each line type (walls, infill, support) in its own color, and the print time and filament the slicer estimated. DXF drawings show their text and dimensions. Light or dark appearance, following the system. Pro Pro is a one-time purchase, not a subscription, and works with Family Sharing. It adds point-to-point, angle, radius…