# MPO Viewer — 3D Stereo Photo & Video Viewer > 3D Stereo Photo & Video Viewer (iPhone/iPad app by G.G. van der Steen.) - Source: https://appshunter.io/ios/app/mpo-viewer/id6800211928 (this page in markdown: same URL + `.md`) - Developer: [G.G. van der Steen](https://appshunter.io/developer/6800212440) - Category: Photo & Video - Price: Free with in-app purchases - Age rating: 4+ - Requires: iOS 26.0 · 4 MB - Languages: American English, Dutch - Released: 2026-08-19 - Data updated: 2026-09-18 - User reviews in markdown: https://appshunter.io/ios/app/mpo-viewer/id6800211928/reviews.md ## What is MPO Viewer? MPO Viewer opens your stereoscopic 3D photos and video straight from the camera. No conversion, no computer. A dual-lens camera such as the Fujifilm FinePix REAL 3D W1 or W3 saves each photo as an .mpo file holding both eyes. MPO Viewer reads them out and shows the pair in five 3D viewing modes, and plays the stereo video those cameras shoot as well. VIEWING Point it at a folder of .mpo photos or .avi clips, on your device or in iCloud Drive, and browse them in a searchable grid or table. Open any photo in the mode that suits you: • Side by Side: the classic pair, for free-viewing or a stereo viewer or headset • Crossed Eye: the same pair swapped, for cross-eyed viewing • Anaglyph: both eyes merged for coloured glasses (Red/Cyan, Magenta/Green, Amber/Blue or Red/Blue), with eye swapping and ghost reduction • Wiggle: the two eyes flicker back and forth, on a timer or as you tilt the phone • Depth (experimental): a depth map built from the pair, warped as you tilt Whichever mode you pick, the pair is corrected first: the two eyes are brought into line vertically and placed against the screen so the nearest thing in the picture sits at the screen plane, which is what keeps the depth comfortable. Any photo can be shown as the camera shot it instead, and the correction can be switched off. Hold a thumbnail to hide a photo or clip, or select several at once; the Hidden list brings them back, behind Face ID if you want it that way, and the file itself never moves. Captions are kept by the app, and Settings can write them out to the folder or read them back in, so they travel with your photos. An info button shows what the camera recorded, down to lens, aperture, shutter and ISO, with a map when the photo carries a location. 3D VIDEO Stereo clips play with sound in Side by Side, Crossed Eye and Anaglyph. FRAMES, CAPTIONS AND SLIDESHOWS Frame photos and clips with a plain border or one of six passepartouts, from a stereo card to a cardboard peep box. Add a focus helper to align your eyes, caption any photo, and run a slideshow through a folder. SHARE AND EXPORT Side by Side, Crossed Eye and Anaglyph export as PNG or JPEG, Wiggle as an animated GIF or a cross-faded video, and Depth as an MP4 tilt-sweep. A clip exports as MP4 at three sizes, with or without its sound, or as a single frame, and a marked start and end limit the export to that span. Exports carry a watermark, and MPO Viewer Pro removes it. ACCESSIBILITY Works with VoiceOver, the largest text sizes, and Reduce Motion, where Wiggle and Depth follow your tilt rather than moving by themselves. If you cannot fuse a stereo pair, those two modes work with one eye. PRIVACY Entirely offline. Your photos never leave your device. No accounts, no analytics, no data collection. In English and Dutch. For anyone rediscovering a box of old stereo camera photos, and for anyone still shooting 3D today. ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | MPO Viewer Pro | $4.99 | one-time | ## Version history (last 5 releases) ### 1.10 — 2026-09-14 New in this update: • Comfortable depth. Every stereo pair is now placed against the screen before you see it: the app measures where the nearest thing in the picture sits and moves the pair so that point lands on the screen plane instead of in front of it. That is often the difference between a pair your eyes settle into and one they fight. It applies in all five viewing modes and to what you export, it is on by default, and Comfortable Depth in Settings turns it off. • The two eyes are now brought into line vertically as well. No dual-lens camera holds both lenses exactly level, and the few pixels of height difference that leaves is something your eyes can only absorb by working at it, which is where tiredness after a handful of photos comes from. The app measures that offset across the whole frame and takes it out, in every mode and in exports, under the same Comfortable Depth switch. • One photo at a time can stay out of it. If a placed photo looks wrong to you, a button in the viewer shows it as the camera shot it, out of line included, and the app remembers that for that photo. • The viewer's top row has made room for that button, next to Close, in the same place in every mode. The slideshow button has moved to the bottom right, opposite Export. • Wiggle no longer crops a large part of the picture away on the odd photo. It was trusting a single vertical measurement that the rest of the frame does not agree with; a measurement the frame cannot confirm is now refused rather than acted on. • A photo or clip you are done with can leave the view. Hold its thumbnail and Hide takes it out of the library, or choose Select to take several at once. Hidden in the sort menu shows what you hid and puts any of it back, and if you would rather nobody else opened that list, Settings can put it behind Face ID, Touch ID or your passcode. The file itself stays exactly where it is: MPO Viewer no longer moves, renames or deletes any of your photos or clips. • Your captions now live in the app rather than in a file among your photos. The ones you already had are brought across the first time you open the app, and Settings can write them back out to the folder, or read them in again, whenever you want to carry them to another device. • Anaglyph and Wiggle could get stuck on the loading spinner. The two eyes were cropped from fractional positions and could come back a pixel apart, which the merge refuses. Crops now land on whole pixels, and a merge that does fail says so instead of loading for ever. ### 1.9 — 2026-09-10 New in this update: • The viewer's controls stay put when you switch modes. Wiggle and Depth carry no field of view slider, so the mode picker used to slide to the right edge and the export row sat a line higher than everywhere else. Every mode now holds the same slots, at every text size. The slideshow button has moved left, next to Close. • The Depth shadow has been taken out again. It drew the gaps where the picture runs out instead of blurring over them, which made them easier to see but no smaller. The setting and the button in the viewer are both gone. ### 1.8 — 2026-09-08 New in this update: • Photos now open at their own depth. A 3D camera puts the screen plane at infinity, which leaves everything you can actually see floating in front of it. The app now puts that plane on the picture itself: the distance just behind it, the subject on it, the foreground just in front. A photo looks less deep at first because of this. What came off is an offset. The depth itself is still there, and Depth Shift puts the push back wherever you want it. • Ghost Reduction, new in Settings. Subtracts the light each lens leaks from the other eye, so edges show through less. Turned up far it darkens the photo, so turn it until the show-through goes and stop there. • Depth has been recalibrated. The same strength came out differently on different photos, because the app had no idea how big a unit of depth was. Now it measures that per photo. The setting is called Strength, where 1.00 is the depth the camera captured. Your old Intensity value does not carry over, because it meant something different on every photo. • Zooming in Anaglyph works from the part you have zoomed into rather than the middle of the whole photo. Red and cyan also no longer drift further apart as you zoom. • Search looks at the file name as well. A photo without a description could not be found before. • Swiping between photos follows your finger until you let go, instead of snapping halfway. • An export can be called off. A Cancel button sits over the progress, and whatever was half written is cleaned up. • The library opens faster and stays smooth, and clip thumbnails appear at once. • Depth holds far less memory while it works, so large photos get through more often. • An incoming call interrupts a clip properly and playback comes back on its own afterwards. Pulling out headphones stops it. • Damaged or unusual clips no longer trip the app up, and exports now work at sizes that used to fail. • Also fixed: a rotated photo's size in the info panel, the shutter speed, a long description used as a filename, the empty share sheet after an export, the cloud badge on a downloaded photo, and the viewer jumping to a different photo when the folder changed underneath it. ### 1.7 — 2026-09-07 New in this update: • Wiggle and Depth now follow Reduce Motion. With it on they no longer move by themselves but follow how you tilt the phone, and Depth keeps its swing in check. Settings carries a switch to turn that off again. • VoiceOver reads the library. Every photo and clip gives its description, or else what it is and when it was taken, and you can open and export without seeing where you tap. • In the viewer VoiceOver names the photo you are on, with actions to show the controls and to zoom in and out. • Double-tap now zooms in from the whole photo, and double-tapping again zooms back out, so zooming works without a pinch. The zoom level is spoken. • The library now sorts by when a photo or clip was taken rather than by the file's date, so a folder you copied is back in the right order. • If you cannot fuse a stereo pair, the app now points you at Wiggle and Depth. Those two work with one eye. • An exported anaglyph now carries the glasses in its filename — redcyan, magentagreen, amberblue or redblue — instead of rgv for all of them. With the eyes swapped the two words swap too. • The sliders in Settings now tell VoiceOver their name and their value, and the app stays usable at the largest text sizes. • Reduce Motion now covers the whole app: panels and zoom steps appear at once instead of animating into place. • With VoiceOver a zoomed photo can now be moved without dragging — four actions alongside zoom in and out. • The segmented controls in Settings become a menu at the largest text sizes, so their labels grow with everything else. • At those sizes the viewer's controls wrap onto more rows instead of ceasing to grow, so every button stays reachable. • Holding a photo now shows a menu with Export rather than exporting straight away — the gesture explains itself. • About lists every gesture, so double-tapping and swiping are no longer things you have to stumble upon. • Fixed: switching modes in the viewer works first time again. ### 1.6 — 2026-09-05 New in this update: • Depth Shift for Anaglyph. A button under the picture opens a slider, the way Field of View already works in Side by Side. • Slide right and the subject sinks behind the screen; slide left and it comes forward. It is there for the pair that sits too deep to fuse comfortably, and for the flat one that could use more relief. • The setting is remembered and applies to photos, 3D clips and what you export alike. Settings carries the same slider, with a reset. • Side by Side and Crossed Eye now show a caption with the frame style set to None as well. There is no border to hold it, so it sits over the bottom of both photos, the same on the left and the right. • With a border you can put it there too: the caption position adds In Photo, next to under the left photo, the right one, or both. The button under the photo still switches it off, and exports carry it either way. --- *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 2026-09-18.*