TwinViewer vs Image Compare.
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TwinViewer
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.
- Dual-screen photo viewing
- Side-by-side photo comparison
- Create combined images
- View EXIF data
- Zoom and swipe navigation
- Sync/Async viewer modes
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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.
Image Compare.
Easily compare two images using various modes like side-by-side, slider, opacity, or difference. Zoom in for detailed inspection and export comparison results.
- Concurrent side-by-side comparison
- Slider comparison
- Opacity comparison
- Difference comparison
- Zoom for detail
- Export difference images
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Compare two photos, instantly. From photo edits and DIY projects to plant growth records — see exactly what changed, in four powerful modes. # Four Comparison Modes ▼ Side by Side View both images at once. Perfect for progress photos. ▼ Slider Drag a slider across one image to reveal the other underneath. Smoothly check before/after photo edits. ▼ Opacity Overlay two images and adjust transparency. Great for spotting alignment shifts and subtle changes. ▼ Difference Subtract one image from the other to highlight only what's changed. Reveals details invisible to the naked eye. * You can save the difference image to your Photos. # Features ・Pinch to zoom in Slide, Opacity, and Difference modes for detailed inspection. ・Two processing options for Difference mode: - Express: Resizes to screen width before processing (fast). - Original: Processes at full resolution (high accuracy, takes longer. Both images must be the same size). ・Export the difference image to Photos or share it directly. # Privacy First ・Works completely offline. Your images never leave your device. ・Photo library access is only used when selecting images to compare.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | TwinViewer | Image Compare. |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (24 ratings) | 4.5 (31 ratings) — better |
| Positive reviews | 64.0% of reviews | 88.9% of reviews — better |
| Number of ratings | 24 | 31 — better |
| Update frequency | Every 5 weeks — better | Every 4 months |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Ad-supported — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Masako Sakanashi | Reiji Kobayashi |
Customer experience
TwinViewer
Image Compare.
In-app purchases
TwinViewer
- Full Version$4.99
Image Compare.
No in-app purchases
Questions
Is TwinViewer free?
Is Image Compare. free?
Which has better reviews, TwinViewer or Image Compare.?
Do TwinViewer or Image Compare. have ads?
Which is updated more often, TwinViewer or Image Compare.?
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