# TwinViewer — Side-by-Side Photo Viewer

> Dual-screen photo viewer for comparison, editing, and combined image creation. (iPhone/iPad app by Masako Sakanashi.)

- Source: https://appshunter.io/ios/app/twinviewer/id531595249 (this page in markdown: same URL + `.md`)
- Developer: [Masako Sakanashi](https://appshunter.io/developer/410497749)
- Category: Photo & Video, Utilities
- Price: Free with in-app purchases
- Rating: 4.00/5 from 24 App Store ratings · 80 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.0 · 1 MB
- Languages: American English, French (France), German (Germany), Japanese
- Released: 2012-06-10
- Data updated: 2026-06-10
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/twinviewer/id531595249/reviews.md

## What is TwinViewer?

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.

## Key features

- Dual-screen photo viewing
- Side-by-side photo comparison
- Create combined images
- View EXIF data
- Zoom and swipe navigation
- Sync/Async viewer modes

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Full Version | $4.99 | one-time |


## Recent user reviews (10 of 80)

All indexed reviews: https://appshunter.io/ios/app/twinviewer/id531595249/reviews.md

### 5/5 — Reason I bought new iPad

*2025-01-05, version 12.3*

Tried many iOS apps and Windows apps on a Surface pro. This single app is the reason I bought my new iPad. Nothing came close to the ease of use, speed, features, intuitive UI, support, etc.

Had over 10,000 photos I needed to cull quickly and this app fit the task perfectly. 1 very cool feature is the ability to flash full screen images back-and-forth to compare very minor detail. I had 1,000’s of whale photos with very minor differences in details and focus which made this feature alone well worth the price.

### 1/5 — Can’t view any images…single or twin

*2024-09-25, version 12.3*

The app is saying there are no images to view

### 5/5 — BEST APP for side by side comparison photos

*2024-05-07, version 12.1*

I’ve tried so many apps for side by side before and after photo comparisons and this is definitely the best and easiest to use. Development team is also SUPER responsive!

### 3/5 — Having problems

*2024-01-20, version 11.7*

App worked great for years but within the last few months I’ve been getting a “photos aren’t available locally” error every other time I try to open an image. I checked my Privacy settings as was suggested in a previous reply and Twinviewer was already set to All Photos. Reinstalling didn’t help, only temporary fix I’ve found is that sometimes resetting the devices works.

### 5/5 — great app no subscription fee

*2023-12-05, version 11.7*

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.

### 1/5 — Need more instructions. I purchased it and nothing happens

*2023-10-09, version 11.7*

Used this app once and it worked once. Today nothing would work, so I upgraded and still nothing happens. No choices to choose from. Cannot open my photos to choose anything. Think there might be special instruction somewhere, but where? What is wrong? Would like it to work. Tell me what needs to be done to make it work? If it is broken then please refund my my money. Thank you

### 5/5 — Best Before and After app

*2023-03-06, version 11.7*

I am a aesthetician and I use this app for my Before and After pictures!

### 4/5 — Still using it today

*2023-02-12, version 11.7*

It pairs nicely with Procreate when referencing images.

### 5/5 — Excellent

*2022-09-03, version 11.7*

I’ve been using the full version now for a few years and have found it excellent especially for comparing visual and / or metadata details on almost identical images, prior to Twin Viewer I tried several other similar apps but for me this one was the best, I haven’t felt the need to look any further.

### 5/5 — The perfect app that connects no data about you!

*2022-06-29, version 11.7*

I am going to buy this, not because I need the extra features but it’s everything indeed and the dev actually doesn’t collect your life story (ie personal data)

## Frequently asked questions about TwinViewer

### What does TwinViewer do?

TwinViewer is a dual-screen photo viewer that allows you to view two albums simultaneously. You can compare photos side-by-side, select the best shots, delete unwanted ones, create combined images, and access detailed EXIF data.

### How do I use TwinViewer?

You can swipe left/right to browse photos, pinch to zoom, and double-tap to enter full-screen mode. Buttons are available to switch between sync/async modes, swap viewers, show grid lines, view EXIF data, and create snapshots of combined images.

### Is TwinViewer free to use?

The application can be downloaded for free. However, an in-app purchase is required to unlock and use all of its functions.

### What are the main use cases for TwinViewer?

This app is ideal for photographers who need to compare multiple takes of the same subject to pick the best one, or for users who want to easily delete duplicates or less desirable photos. It also facilitates the creation of side-by-side combined images for sharing.

### What devices is TwinViewer compatible with?

While specific compatibility details are not provided in the description, it is a mobile application, implying it is designed for smartphones and tablets. Users should check their device's app store for specific operating system requirements.

## Version history (last 5 releases)

### 12.3 — 2024-07-09

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

### 12.2 — 2024-05-13

• Added face zoom function by face detection
• Fixed bugs
• Minor improvements

### 12.1 — 2024-05-07

• Photo Library Scan option is now enabled
  If you have a huge number of images, the quick scan is recommended.
• Fixed bugs
• Minor improvements

### 12.0 — 2024-05-05

MAJOR UPDATE!
• Optimized for iOS 17 (Requires iOS 16.0 or later)
• Completely improved user interface
• Supports Dark mode
• Changed restrictions in the free version
  (All functions will be available except for limit number of swipe operations when viewing photos)
• Fixed bugs
• Minor improvements

### 11.7 — 2022-02-24

- Fixed bugs.
- Minor improvements.

## Apps similar to TwinViewer

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [写真で顧客管理アプリ ビフォーアフター](https://appshunter.io/ios/app/id1239269208) | — | Free | Photo & Video |
| [Before After Effect Collage BA](https://appshunter.io/ios/app/before-after-effect-collage-ba/id1474009694) | 4.6 (371) | Free | Photo & Video |
| [Photo before and after](https://appshunter.io/ios/app/photo-before-and-after/id1671430867) | — | Free | Photo & Video |
| [Photo Compare - Before & After](https://appshunter.io/ios/app/photo-compare-before-and-after/id1537250336) | 4.5 (2,552) | Free | Photo & Video |
| [Before and After Photo Сompare](https://appshunter.io/ios/app/before-and-after-photo-ompare/id1667877581) | 3.9 (7) | Free | Photo & Video |
| [Images Comparison](https://appshunter.io/ios/app/images-comparison/id1639770274) | 4.8 (10) | Free | Photo & Video |

## More apps by Masako Sakanashi

- [Balloon Stickies](https://appshunter.io/ios/app/balloon-stickies/id410497746)
- [Balloon Stickies Plus](https://appshunter.io/ios/app/balloon-stickies-plus/id699592020)
- [Stamp Meister](https://appshunter.io/ios/app/stamp-meister/id725400299)
- [Count Helper](https://appshunter.io/ios/app/count-helper/id882447467)
- [CostMan - manage your expenses](https://appshunter.io/ios/app/costman-manage-your-expenses/id987312187)

All apps by Masako Sakanashi: https://appshunter.io/developer/410497749

## Related topics

[+twinviewer ios alternative](https://appshunter.io/ios/topics/twinviewer-ios-alternative)

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*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 2026-06-10.*