# TwinViewer vs Image Compare.

The clearest difference is in-app purchases: Image Compare. at none against TwinViewer's 1. Image Compare. also leads on rating (4.5 vs 4.0) and review sentiment (89% vs 64%). TwinViewer's advantage is ads (none vs shown) and update cadence (every 5 weeks vs every 4 months). On price, ratings volume and device support there is nothing between them.

Both are free to download. TwinViewer sells 1 one-off in-app purchase. Image Compare. asks for nothing beyond the download.

Image Compare. holds the better App Store score, 4.5 against 4.0. Both are backed by a comparable volume of ratings — 24 and 31 respectively. Written reviews point the same way: 64% of TwinViewer's written reviews are positive against 89% of Image Compare.'s.

TwinViewer ships an update every 5 weeks, Image Compare. every 4 months. The most recent releases landed on September 17, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | TwinViewer | Image Compare. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (24 ratings)](https://appshunter.io/ios/app/twinviewer/id531595249/reviews) | **[4.5 (31 ratings)](https://appshunter.io/ios/app/image-compare/id1544276764/reviews)** |
| Number of ratings | 24 | **31** |
| Positive reviews | 64.0% of reviews | **88.9% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 5 weeks** | Every 4 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 1 MB | 10 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Masako Sakanashi](https://appshunter.io/developer/410497749) | [Reiji Kobayashi](https://appshunter.io/developer/1513077226) |

## What reviewers say

### TwinViewer

[App page](https://appshunter.io/ios/app/twinviewer/id531595249)

View and compare two photo albums side-by-side. This app allows you to pick the best shots, delete unwanted ones, create combined images, and access detailed EXIF data. It offers intuitive gestures for navigation and zooming.

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

**Features:** Vision Pro support

**In-app purchases (1)**

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


### Image Compare.

[App page](https://appshunter.io/ios/app/image-compare/id1544276764)

Easily compare two images using various modes like side-by-side, slider, opacity, or difference. Zoom in for detailed inspection and export comparison results.

**Highlights:** Concurrent side-by-side comparison, Slider comparison, Opacity comparison, Difference comparison, Zoom for detail, Export difference images

**In-app purchases:** none


## Frequently asked questions

### Is TwinViewer free?

TwinViewer is free to download, with in-app purchases available.

### Is Image Compare. free?

Image Compare. is free to download, with no in-app purchases.

### Which has better reviews, TwinViewer or Image Compare.?

Image Compare. is rated higher. TwinViewer averages 4.0 out of 5 from 24 ratings, while Image Compare. averages 4.5 from 31 ratings.

### Do TwinViewer or Image Compare. have ads?

Image Compare. shows ads; TwinViewer does not.

### Which is updated more often, TwinViewer or Image Compare.?

TwinViewer ships an update every 5 weeks, and Image Compare. every 4 months. Most recently, TwinViewer was updated on September 17, 2026 and Image Compare. on September 15, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*