STL Viewer: 3D Model, 3MF, OBJ

Open STL, OBJ, 3MF and GLB 3D models on your phone, check their size and inspect them before you print. Everything works offline, with no ads and no account. OPEN FILES FROM ANYWHERE • STL (binary and ASCII), OBJ with MTL, 3MF and GLB/glTF • Pick a file, or use Open with / Share from your file manager, your downloads or a messaging app • Very large models open as a sampled preview with a clear message, so the app stays responsive VIEW • Orbit, zoom, pan and reset with touch • Shaded, wireframe and solid modes • Light and dark theme • Model info (triangles, vertices) and a list of recent files MEASURE (FREE) • Bounding-box dimensions: width, depth and height • Two-point distance with snapping to vertices • Millimeters or inches PRO: ONE-TIME UNLOCK Pay once, no subscription: • Volume and surface area • Measurement report export (CSV and PNG) • Cross-section view • Wall-thickness check • Printability checks: open edges, flipped normals, non-manifold edges • Overhang analysis • Lighting presets and color options NO ADS, NO ACCOUNT The app shows no ads and needs no sign-up. It opens only the files you choose and never uploads them. Usage statistics and crash reports (Google Firebase) are on by default and can be switched off in Settings. Analysis results for very large files that open as a sampled preview are approximate.