TwinViewer 4+

Dual screen photo viewer

Masako Sakanashi

    • 4.2 • 13 Ratings
    • Free
    • Offers In-App Purchases



TwinViewer is a dual-screen photo viewer application.

You can view two different albums simultaneously, compare two photos side by side, pick a better shot, or leave one and delete another.
This is more than just a viewer. You can also create side-by-side combined images, get the detailed EXIF data, etc.

----- HOW TO USE -----

- Swipe left/right to browse next/previous photo.
- Pinch open/close with two fingers to zoom in/out.
- Double tap either one to display in full-screen mode.
- Sync/Async button to switch the sync mode between two viewers.
- Swap button to switch two viewers.
- Grid button to show/hide grid liens.
- Data button to show/hide data such as image size or shooting date.
- Export button to created and share side-by-side images.

----- WHAT'S FULL VERSION? -----

If you upgrade to the full version by in-app purchase, the following restrictions will be unlocked.

・Create and save side-by-side combined images.
・Display image metadata.

What’s New

Version 11.7

- Fixed bugs.
- Minor improvements.

Ratings and Reviews

4.2 out of 5
13 Ratings

13 Ratings


Great Viewer

I was looking for an app to open my video game app to play on my card board viewer. *box app allows viewing on my iOS devices now, but no way to split . I tested this app with a screen shot and applied it to both screens , placing my phone in my VR device and it worked perfectly once my eyes adjusted. This is the closest thing I found. If I could open the app instead of a photo and mirror the other side it would allow me to view whatever I want on a portable viewing system anywhere anytime, sitting laying or standing. Without spending $600 on a proprietary VR and AR devices. If the developers can make that I would purchase it. This app does what it says , but can be so much more. Thanks.

cmhawke ,

Minor issues

Would be great if Recently Deleted were an available folder on the menu, seeing as more and more apps have managed to implement this option.

Otherwise, best tool for comparing images that I've used; more convenient and quicker than using the layer method in the typical photo editor.

Update: the below is now fixed, thanks!

I noticed (I believe within the last few versions) that the iOS status bar at the top (containing network info, time, battery and other indicators) no longer disappears when attempting to view an image full-screen in the app. This makes image comparisons more difficult or less convenient in some situations (e.g. screenshots taken in the app of zoomed-in portions of an image pair). It would be appreciated if this issue could be fixed by either hiding the status bar and ensuring the image is truly full-screen, or at least giving the option to completely hide it.

Developer Response ,

Thank you for your encouraging comments and I'm sorry I could not meet all your requests.

rarelyposter ,

Great little app. (Update)

I’m a photographer and retoucher. So it’s nice to be able to compare the original photo with the retouched photo.

After the response from the developer I found the exact feature I was looking for. I missed the instruction in the beginning! My mistake! Being able to tap to quickly switch back and forth between the photos so I can easily see what has been changed. Perfect! Paid for the full version after finding this out!

I guess another neat feature would be if there was also an option to have a slider to compare photos. Where you could slide to your finger back and forth and reveal the second image. Similar to the app “Photo Compare.” This would be a really cool way to compare images.

But the app is already wonderful! This is exactly what I’ve been looking for! ありがとうございました!素敵なアップです!

Developer Response ,

Thank you for your feedback. I'm sorry for the insufficient usage information. The app already has the function. Double-tap either one of photos to see it on full screen. Tap it to switch. Long-press to switch quickly. You can see more help in Information page. I hope it would suit your needs. ;)

App Privacy

The developer, Masako Sakanashi, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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