# TwinViewer

> Side-by-Side Photo Viewer

Canonical page: [https://chrome-stats.com/d/id531595249](https://chrome-stats.com/d/id531595249)

## Overview

- **ID:** `id531595249`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Masako Sakanashi
- **Category:** Photo & Video
- **Rating:** 4.00 / 5 (24 ratings)
- **Version:** 12.3
- **Last updated:** 2024-07-09
- **First published:** 2012-06-10
- **Size:** 947 KB
- **Data as of:** 2026-09-21
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/twinviewer/id531595249)
- **Website:** [https://www.sakanapps.com](https://www.sakanapps.com/)
- **Privacy policy:** [https://www.sakanapps.com/privacy\_policy.html](https://www.sakanapps.com/privacy_policy.html)

## Description

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.

## Rankings

- #244,918 — Overall

## Review summary

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).

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Source: [Chrome-Stats](https://chrome-stats.com/d/id531595249)