TwinViewer

Name: TwinViewer
Author: Masako Sakanashi

By: Masako Sakanashi

Side-by-Side Photo Viewer

Features & Capabilities

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.

User Growth & Download Statistics

App

By:

Masako Sakanashi

Version:

12.3 Last updated: 2024-07-09

Version code:

867345514

Creation date:

2012-06-10

Compatible devices:

Size:

947.00KB

URLs:

Website ,Privacy policy

Full description:

Source:

Apple Apps Store

Data ingested on:

2026-06-06

Compare stats and ranking:

Ranking

# 1,179,849 ▼ 904,303

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Apple app. Please use these information below to contact the Apple app developer.

Developed by:

Masako Sakanashi

Apple Apps Store

https://apps.apple.com/cn/app/twinviewer/id531595249?l=en-GB

Website:

https://www.sakanapps.com

User Reviews

TwinViewer shines for fast, intuitive side-by-side image comparisons, ideal for culling large photo libraries and teaching before/after concepts. Reviewers praise its ease of use, speed, and a one-time purchase model, along with responsive developer updates. A common drawback is the paywall to save/export, with several calling the pricing deceptive. Upgrade flow can be unclear, and a few users report reliability bumps. Overall, it’s a strong tool for photographers who don’t mind paying for export functionality.

Pros

Very easy to use with an intuitive UI; praised for speed and simplicity in side-by-side comparisons.
Excellent for handling large photo libraries and quick culling.
Great for before/after comparisons, teaching, and saving combined images with captions.
No ongoing subscription; one-time purchase is seen as good value.
Developer responsiveness and timely updates based on user feedback.

Cons

Free version restricts saving/exporting; you must upgrade to save images.
Perceived deceptive pricing / paywall; some reviewers call it a scam.
Upgrade flow can be unclear or hard to locate; accessing core export features requires payment.
Occasional reliability issues reported by some users (e.g., features not working until upgrade).

Recent reviews

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.

by Ju*****, 2025-01-05

The app is saying there are no images to view

by em*****, 2024-09-25

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!