STL Workshop vs Quick3D CAD Viewer

STL Workshop is a 3D model viewer and editor built for 3D printing. IMPORT • STL (binary, ASCII, colors), OBJ, PLY, 3MF, USDZ • From Files, Mail, AirDrop — open any model in seconds VIEW • 7 render modes: shaded, edges, wireframe, x-ray, normals, overhangs, wall thickness • Interactive section cut, layer preview, exploded view • Studio and HDR lighting, realistic materials ANALYZE • Full diagnostics: watertightness, manifold topology, normals, shells • Dimensions, volume, surface, weight and cost by material and infill • Estimated print time, bed stability, center of gravity • Precise measurements: distance, angle, diameter PREPARE • Automatic repair: filled holes, fixed normals, removed debris • Auto-orientation minimizing overhangs on import • Scale, rotate, mirror, lay flat, automatic base • Hollowing with drain holes (resin), drilling and booleans, embossed or engraved 3D text • Grid duplication, predefined printer beds EXPORT • STL, OBJ, USDZ and augmented reality (AR Quick Look) • HD transparent captures, 360° GIF • Direct upload to OctoPrint or WebDAV servers • Siri Shortcuts: convert to USDZ, repair an STL Units in millimeters. No ads, no data collection.

Quick3D Viewer is a free, ad-supported 3D viewer for iPhone and iPad. View models, take measurements and explore CAD geometry on your device, whether you are reviewing a design, checking a part on the shop floor or inspecting a model for 3D printing. V2.0 introduces a contextual interface that presents tools for the current task, with an iOS light-mode-based design. Move between 3D viewing, the model tree, measurement and analysis. Supported formats STEP / STP, IGES / IGS, STL, OBJ, PLY, 3MF, GLB / glTF and USDZ / USD. Available hierarchy, colors and units depend on the format and file. Mesh display supports static geometry and base colors, with limitations for textures, transparency and animation. Viewing and measurement - Rotate, zoom, pan and fit the model to the view. - Select parts and control their visibility in the model tree. - Measure point-to-point distance, diameter, radius, planar-face distance and cylinder-axis distance where the geometry and format support them. - Keep up to 10 recent files. - Hide viewer banner ads using the existing full-screen mode. CAD analysis in V2.0 - Bounding dimensions: inspect model-coordinate X, Y and Z dimensions for the whole model or a selected body, in mm or inches. - Volume, mass and centroid: calculate properties of a valid single closed solid. Use material density presets or a custom density and show a centroid marker. - 3D annotations: place pins, leaders and comments on the model, save them on your device and reopen them later. - Dynamic sections: set the plane direction and position for a section preview and B-Rep section lines. - Integrated draft and undercut analysis: inspect color-coded draft angles and sampled undercut candidates for a specified straight pull direction. - STEP comparison: select bodies from the same assembly or separate files. View removed, added and common regions with their volumes. Scope and limitations B-Rep analysis requires STEP or IGES geometry. Volume, mass and comparison require valid closed solids. Assembly overlaps are not automatically removed to calculate a total. Comparison operates on one closed solid per side in the same coordinate system. Comparison and capped sections are limited to 2,000 faces per target; CPU section previews accept up to 100,000 input triangles. Draft and undercut results are approximate, can miss small features and do not guarantee manufacturability. Mass calculated from density is an estimate. Mesh formats lack analytic CAD surface information, so some measurements and analyses are unavailable. Assumed or unknown units are identified. Point-to-point measurement may also be unavailable for USD files whose units cannot be read. Privacy Model loading and analysis run on your device. The app does not upload CAD files to a developer-operated analysis server. Recent-file history and annotations are stored on your device. Google AdMob provides advertising and Google UMP handles consent management. See the privacy policy for advertising-related data practices. Japanese and English interfaces are supported.