# Open3D: STL & 3D Model Viewer — View STL, GLB, STEP, DXF & OBJ > Fast, free, on-device 3D model viewer for various formats with AR and print checks. (iPhone/iPad app by Rajesh Konatala.) - Source: https://appshunter.io/ios/app/open3d-stl-and-3d-model-viewer/id6772109964 (this page in markdown: same URL + `.md`) - Developer: [Rajesh Konatala](https://appshunter.io/developer/1882436576) - Category: Graphics & Design, Utilities - Price: Free - Rating: 4.80/5 from 5 App Store ratings · 2 written reviews indexed - Age rating: 4+ - Requires: iOS 15.0 · 66 MB - Languages: American English - Released: 2026-05-28 - Data updated: 2026-09-10 - Monetization: ad-supported - User reviews in markdown: https://appshunter.io/ios/app/open3d-stl-and-3d-model-viewer/id6772109964/reviews.md ## What is Open3D? Open3D Viewer is the fastest free 3D model viewer for STL, GLB, OBJ, FBX, STEP, DXF, USDZ, PLY, 3MF, GLTF, IGES, DAE and 3DS files. Open any 3D file in seconds, view it in AR with Apple Quick Look, and check it for 3D printing — no account, no sign-up, no cloud upload. Your files never leave your iPhone or iPad. Whether you're a 3D-printing hobbyist checking an STL before slicing, a 3D artist previewing a GLB or FBX, or a CAD user opening a STEP or DXF, Open3D Viewer opens it instantly — without the paywalls and login screens other 3D viewers force on you. SUPPORTED 3D FILE FORMATS • Mesh: STL, GLB, GLTF, OBJ, PLY, 3MF, FBX, DAE, 3DS, USDZ • CAD: STEP / STP, IGES / IGS, DXF A 3D VIEWER THAT DOES THE BASICS RIGHT • Open files from Files, email, downloads, or any "Open with" menu • Smooth orbit, pan and zoom touch controls • Render modes: solid, wireframe, X-ray, textured, matte • Wireframe overlay — see the geometry on top of the rendered surface • Preset camera views (front, side, top, perspective) • Light and dark themes • 5 background colours + 6 HDRI lighting environments (studio, sunset, dawn, dusk, dark, white) • Play built-in animations • View 3D models in AR via Apple Quick Look (USDZ) • Capture a screenshot or a rotating GIF and share it • Recent files with auto-generated thumbnails • Full model specs: triangle count, vertices, materials, textures, bounding box BUILT FOR 3D PRINTING • Print-readiness check: manifold / watertight detection, overhangs, wall thickness • Bed-fit check for popular printers (Bambu A1, Prusa MK4, Ender 3, Bambu X1C) • Rough weight, filament length and cost estimates • Measure distances on the model • Cross-section / clipping plane to inspect interiors • Scale and resize tool • Convert and export between GLB and STL LOCALIZED The interface automatically follows your device language. Currently available in English, German, Spanish, French, Portuguese, Hindi, Japanese, and Chinese. NO ACCOUNT. NO CLOUD. NO NONSENSE. • No sign-up, ever • 100% on-device. Works offline. • We never read, scan, or upload your files • We don't track which files you open The STL viewer and GLB viewer that makers, 3D artists and engineers actually want: clean, fast, and local. Measurements and print-readiness figures are estimates, not a replacement for a slicer or proper measuring tools. See the in-app Disclaimer. Open3D Viewer is an independent app and is not affiliated with the Open3D open-source library at open3d.org. All trademarks belong to their respective owners. Privacy policy: https://open3d.app/privacy.html ## Key features - Supports over 15 3D file formats - Augmented Reality (AR) viewing via Apple Quick Look - 3D printing readiness checks (manifold, overhangs, wall thickness) - On-device processing, no cloud upload required - Detailed model specifications (triangle count, bounding box) - Export between GLB and STL formats - Offline functionality ## Recent user reviews (2 of 2) All indexed reviews: https://appshunter.io/ios/app/open3d-stl-and-3d-model-viewer/id6772109964/reviews.md ### 5/5 — Great stuff *2026-08-09* Initial impressions are fantastic. Two small pieces of feedback: there have been a couple .3MF that have been unable to render (but have also printed successfully). And a feature request to be able to view flat 3D files like DWG. **Developer response:** Thanks for the 5 stars! For the .3MF files that fail — mind mailing one to support@open3d.app? I'll trace exactly why and patch it. DWG is closed-format so it needs a bit of plumbing, but I'm adding auto-DWG support in the next Windows update (v1.1.4) via ODA File Converter. Coming soon. ### 5/5 — Looks good *2026-07-11* Just getting started but looking good so far! **Developer response:** Thank you ! ## Frequently asked questions about Open3D ### What 3D file formats does Open3D support? Open3D supports a comprehensive list of mesh formats including STL, GLB, GLTF, OBJ, PLY, 3MF, FBX, DAE, 3DS, and USDZ. It also handles CAD formats like STEP/STP, IGES/IGS, and DXF. ### Can I view 3D models in Augmented Reality with Open3D? Yes, Open3D allows you to view 3D models in AR using Apple Quick Look, provided the model is in a compatible format like USDZ. This feature lets you place and interact with your 3D models in your real-world environment. ### Does Open3D have ads? Yes, Open3D contains advertisements. As a free application, it utilizes ads to support its development and maintenance. ### Is Open3D suitable for 3D printing preparation? Open3D includes several features beneficial for 3D printing, such as print-readiness checks for manifold geometry and wall thickness, as well as bed-fit estimations for popular printers. It also offers tools for measuring distances and inspecting model interiors. ### Does Open3D require an internet connection or account? No, Open3D is designed for 100% on-device operation. It works offline and does not require any account sign-up or cloud upload, ensuring your files remain private. ### How often is Open3D updated? The latest version of Open3D was released on July 12, 2026, indicating a relatively recent update. Updates typically address bug fixes, performance improvements, and potentially new features. ### What are the basic viewing controls in Open3D? Open3D offers intuitive touch controls for smooth orbit, pan, and zoom. It also provides preset camera views and various render modes like solid, wireframe, X-ray, and textured. ### What is the age rating for Open3D? Open3D has an age rating of 4+, making it suitable for a wide range of users, including younger individuals interested in exploring 3D models. ## Version history (last 5 releases) ### 1.1.17 — 2026-09-08 Bug Fixes and performance improvements ### 1.1.11 — 2026-08-31 Bug Fixes ### 1.1.10 — 2026-08-30 • Sharper 3D — STL files now rotate around their true centre with proper Z-up orientation, edges are anti-aliased on every device. • Better default lighting — models look like the marketing site's hero viewer out of the box. • Model colour and background remember your choice across every file. • Print check runs ~10× faster on big files, no more UI freezes. • More prominent "measure" and "cross-section" instructions. • Stability fixes for iPhone ### 1.1.3 — 2026-08-11 • Walk-through mode — step inside your models. Virtual joystick + drag to look on mobile, WASD + drag on desktop. • Model colour and background now stick across files and app restarts (thanks Yusuf for the flag). • HDRI environment and background colour are now independent — pick Studio HDRI for lighting, keep your Cream backdrop. • Sharper edges: antialiasing on by default across every device. • STL fixes: models spin around their true centre, Z-up files auto-orient, yaw feels right. ### 1.1.0 — 2026-08-04 Bug Fixes ## More apps by Rajesh Konatala - [Ritn3D: Floor Plan to 3D Home](https://appshunter.io/ios/app/ritn3d-floor-plan-to-3d-home/id6760037325) All apps by Rajesh Konatala: https://appshunter.io/developer/1882436576 ## Related topics [3d print viewer](https://appshunter.io/ios/topics/3d-print-viewer) · [alumetric](https://appshunter.io/ios/topics/alumetric) · [3d stl viewer](https://appshunter.io/ios/topics/3d-stl-viewer) · [drape3d](https://appshunter.io/ios/topics/drape3d) · [openclip](https://appshunter.io/ios/topics/openclip) · [vcom3d](https://appshunter.io/ios/topics/vcom3d) · [letus helix](https://appshunter.io/ios/topics/letus-helix) · [stl mesh](https://appshunter.io/ios/topics/stl-mesh) · [3dexperience forum](https://appshunter.io/ios/topics/3dexperience-forum) · [3d cad model viewer](https://appshunter.io/ios/topics/3d-cad-model-viewer) · [tbdc produtor](https://appshunter.io/ios/topics/tbdc-produtor) · [atomus 3d](https://appshunter.io/ios/topics/atomus-3d) · [lettres3d](https://appshunter.io/ios/topics/lettres3d) · [glb viewer](https://appshunter.io/ios/topics/glb-viewer) · [free stl viewer](https://appshunter.io/ios/topics/free-stl-viewer) · [3d viewer](https://appshunter.io/ios/topics/3d-viewer) · [artist 3d viewer](https://appshunter.io/ios/topics/artist-3d-viewer) · [khronos gltf viewer](https://appshunter.io/ios/topics/khronos-gltf-viewer) · [stl viewer](https://appshunter.io/ios/topics/stl-viewer) · [puzzledom 3d](https://appshunter.io/ios/topics/puzzledom-3d) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-10.*