# TwinViewer vs K&S(写真共有カレンダー)

The clearest difference is in-app purchases: K&S(写真共有カレンダー) at none against TwinViewer's 1. K&S(写真共有カレンダー) also leads on update cadence (every 2 days vs every 5 weeks). TwinViewer's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. TwinViewer sells 1 one-off in-app purchase. K&S(写真共有カレンダー) asks for nothing beyond the download.

TwinViewer ships an update every 5 weeks, K&S(写真共有カレンダー) every 2 days. The most recent releases landed on October 29, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | TwinViewer | K&S(写真共有カレンダー) |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (24 ratings)](https://appshunter.io/ios/app/twinviewer/id531595249/reviews)** | — |
| Number of ratings | **24** | — |
| Positive reviews | 63.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 5 weeks | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Size | 1 MB | 130 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Masako Sakanashi](https://appshunter.io/developer/410497749) | [Sota Fukuhara](https://appshunter.io/developer/1867388914) |

## 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 |


### K&S(写真共有カレンダー)

[App page](https://appshunter.io/ios/app/k-and-s/id6770290344)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is TwinViewer free?

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

### Is K&S(写真共有カレンダー) free?

K&S(写真共有カレンダー) is free to download, with no in-app purchases.

### Do TwinViewer or K&S(写真共有カレンダー) have ads?

K&S(写真共有カレンダー) shows ads; TwinViewer does not.

### Which is updated more often, TwinViewer or K&S(写真共有カレンダー)?

TwinViewer ships an update every 5 weeks, and K&S(写真共有カレンダー) every 2 days. Most recently, TwinViewer was updated on October 29, 2026 and K&S(写真共有カレンダー) on September 26, 2026.

---

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