TwinViewer 4+

Side-by-Side Photo Viewer

Masako Sakanashi

    • 4.2 • 18 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 Lines button to show/hide grid liens.
- EXIF Data button to show/hide data such as image size or shooting date.
- Snapshot button to created and share side-by-side images.

* Please note that this application can be downloaded for free, but in-app purchase is required to use all functions.

What’s New

Version 12.3

• Enabled 2-finger swipe up to delete photo
• Fixed bugs
• Minor improvements

Ratings and Reviews

4.2 out of 5
18 Ratings

18 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.

whotestedthis ,

great app no subscription fee

This is a perfect app to combine multiple photos for a side-by-side comparison etc. The best part is I don’t have to pay a weekly or monthly subscription for something that I only use like once or twice a year which is why I never had kept an app to do this before, past the trial period.
I didn’t know this until after I bought this app but there’s also a different version which is more expensive and does quad photo comparisons. Had I known before,I might’ve purchased that one instead just to give me a more options for the future.

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.

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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