# STL Viewer: 3D Model & 3MF — Open OBJ & GLB files in AR > Open OBJ & GLB files in AR (iPhone/iPad app by Alper Vural.) - Source: https://appshunter.io/ios/app/stl-viewer-3d-model-and-3mf/id6801906359 (this page in markdown: same URL + `.md`) - Developer: [Alper Vural](https://appshunter.io/developer/1728214585) - Category: Developer Tools, Graphics & Design - Price: Free - Age rating: 4+ - Requires: iOS 15.0 · 27 MB - Languages: American English, Arabic, Dutch, French (France), German (Germany), Hindi, Indonesian, Italian, Japanese, Korean and 7 more - Released: 2026-09-14 - Data updated: 2026-10-16 ## What is STL Viewer? STL Viewer is a free, offline 3D model viewer for iPhone and iPad. It opens STL, 3MF, OBJ, PLY, OFF, 3DS, GLB and glTF files, measures them, estimates the print, shows them in AR at real size and converts them to STL. Your models never leave your device and no account is needed. AT A GLANCE • 8 file formats: STL, 3MF, OBJ, PLY, OFF, 3DS, GLB, glTF • Works fully offline, with no upload and no sign-up • Free: no subscription and no in-app purchase • No pop-up, timed or full-screen ads; at most one small banner • 17 languages, on iPhone and iPad VIEW IN AR AT REAL SIZE Place your model on a real desk or floor with AR Quick Look and see its true size before you print it. The camera is used only while AR is open. MEASURE AND ESTIMATE THE PRINT • Measure the distance between any two points, in millimetres • See dimensions, volume, surface area and triangle count • Print estimate: weight, filament length, print time and cost, by printer class, material (PLA, PETG, ABS, ASA, TPU, Nylon), layer height, infill and walls • Cut through the model with a section view CONVERT AND EXPORT TO STL Turn an OBJ, 3MF, PLY, OFF, 3DS, GLB or glTF model into a binary STL in millimetres, ready for any slicer. Every triangle of the source is kept, even when the on-screen preview is simplified. INSPECT EVERY DETAIL • Orbit, pan, zoom and fit to screen • Shaded or wireframe, perspective or orthographic • Front, back, left, right, top and bottom views from the view cube • Change the colour and the surface look: plastic, glossy, wood, stone or carbon SHARE • A rotating 360° GIF • A 9:16 video for stories • An STL copy, only when you choose WORKING WITH 3MF 3MF is the format most modern slicers save. STL Viewer reads the geometry inside a 3MF so you can check a part before printing, with real-world units from the file. Modifier meshes and negative volumes are left out, so you see the part itself. A 3MF that holds only print data, such as G-code, says so instead of opening empty. LOCAL AND PRIVATE Models are processed on your device. STL Viewer does not send model files, filenames, paths, geometry or dimensions to any cloud service, advertising provider or analytics platform. WHAT IT DOES NOT DO STL Viewer is for viewing, measuring, sharing and STL export. It does not edit, repair, slice or print models. Textures, materials and animations are not loaded. Native CAD formats (STEP, IGES, SOLIDWORKS, Fusion) need to be exported to STL, OBJ or 3MF first. QUESTIONS AND ANSWERS How do I open an STL file on iPhone or iPad? Tap Open file in STL Viewer, or choose STL Viewer from Open With or Share in the Files app. Is STL Viewer free? Yes. There is no subscription and no in-app purchase. At most one small banner appears after a model is ready. Does it work offline? Yes. Opening, measuring, AR and export all run on the device without an internet connection. Can I open a 3MF from Bambu Studio, PrusaSlicer or Cura? Yes. The part's geometry opens with its real units; print settings and plates are not read. Can I see an STL in AR at real size? Yes. Tap the AR button to place the model in your room at its real size. How do I measure an STL on iPhone? Open the model, tap the ruler, then Measure distance, and tap two points on the model. Can it estimate filament and print time? Yes. Print estimate shows weight, filament length, time and cost from the part's volume and your printer class, material and settings. It is an estimate, not a slicer result. How do I convert OBJ, 3MF or GLB to STL on iPhone? Open the model, tap Export, then Share as STL. How do I open a GLB or glTF file on iPhone? Open it like any other model. glTF files must keep their buffers embedded; use GLB if yours has a separate .bin file. Are my files uploaded anywhere? No. Models stay on your device. ## Is STL Viewer safe? Not enough ratings yet to assess STL Viewer. ## Is STL Viewer legit? STL Viewer: 3D Model & 3MF appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for STL Viewer is 70 out of 100 points across 7 verification signals from App Store and developer data. ## Version history (last 4 releases) ### 1.7.0 — 2026-10-13 • Opens PLY, OFF, 3DS, GLB and glTF too. • Export any model as STL, at full detail. • See your model in AR at real size — it never leaves your iPhone. • Share a 9:16 video for stories. • Tools fit small screens like iPhone SE, with a fold-away panel. • Fixed 360° GIF sharing and model framing on narrow screens. Your emails keep making this app better and better — thank you! ### 1.5.0 — 2026-09-20 Picking a model no longer fails with "The selected file is no longer available." Files chosen from the Files app, iCloud Drive, or sent over with Open With or Share now open as they should STL, OBJ and 3MF alike. Opening a second model right after the first no longer leaves the previous model on screen under the new file's name. The app now opens on a dark screen with its icon instead of flashing white. ### 1.4.0 — 2026-09-15 Open 3MF files: pick them in the app, or send them from another app with Open with or Share. 3MF units are read from the file, so size and print estimate need no unit choice. A 3MF that holds only print data (G-code) now tells you so. Much larger STL and OBJ models now open, simplified for smooth viewing instead of showing holes. A progress bar shows while a big model loads. ### 1.0 — 2026-09-14 No release notes. ## Apps similar to STL Viewer | App | Rating | Price | Category | | --- | --- | --- | --- | | [LocBench](https://appshunter.io/ios/app/locbench/id6798163220) | — | Free | Developer Tools | | [.md viewer & editor: NanoFile](https://appshunter.io/ios/app/md-viewer-and-editor-nanofile/id6806269455) | — | Free | Developer Tools | | [Mjegulla](https://appshunter.io/ios/app/mjegulla/id6779351887) | — | Free | Developer Tools | | [Shine3D - Pro 3D Viewer](https://appshunter.io/ios/app/shine3d-pro-3d-viewer/id6757391542) | — | Free | Developer Tools | | [STL & 3D Model Viewer - Mes3D](https://appshunter.io/ios/app/stl-and-3d-model-viewer-mes3d/id6761634572) | 4.5 (15) | Free | Developer Tools | | [HetzMate for Hetzner Cloud](https://appshunter.io/ios/app/hetzmate-for-hetzner-cloud/id6756284112) | 5.0 (1) | Free | Developer Tools | ## More apps by Alper Vural - [Hedeflerimiz](https://appshunter.io/ios/app/hedeflerimiz/id6476915865) - [Huzurlu Yaşam](https://appshunter.io/ios/app/huzurlu-yasam/id6499059380) - [Bluetooth Controller BT/LE](https://appshunter.io/ios/app/bluetooth-controller-btle/id6739386030) - [PaRota - Altın & Döviz](https://appshunter.io/ios/app/parota-altn-and-doviz/id6747687974) - [Echo Ball](https://appshunter.io/ios/app/echo-ball/id6755126532) - [Just Bubble Tap](https://appshunter.io/ios/app/just-bubble-tap/id6757010685) All apps by Alper Vural: https://appshunter.io/developer/1728214585 ## Related topics [gcode scanner & stl viewer](https://appshunter.io/ios/topics/gcode-scanner-stl-viewer) · [alper vural](https://appshunter.io/ios/topics/alper-vural) · [stl workshop](https://appshunter.io/ios/topics/stl-workshop) · [efugy 3d slicer](https://appshunter.io/ios/topics/efugy-3d-slicer) · [meshman 3d viewer](https://appshunter.io/ios/topics/meshman-3d-viewer) · [dividia viewer](https://appshunter.io/ios/topics/dividia-viewer) · [stl design](https://appshunter.io/ios/topics/stl-design) · [3d model viewer](https://appshunter.io/ios/topics/3d-model-viewer) · [3d stl viewer](https://appshunter.io/ios/topics/3d-stl-viewer) · [3d model print simple edit](https://appshunter.io/ios/topics/3d-model-print-simple-edit) --- *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 2026-10-16.*