# 集中読書 vs SwingCat

The clearest difference is in-app purchases: SwingCat at none against 集中読書's 2. SwingCat also leads on review sentiment (100% vs 67%). 集中読書's advantage is ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. 集中読書 sells 2 in-app purchases, starting at $1.99 per month. SwingCat asks for nothing beyond the download.

集中読書 ships an update fortnightly, SwingCat every 9 days. The most recent releases landed on October 12, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | 集中読書 | SwingCat |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Fortnightly | **Every 9 days** |
| Monetization | — | Free with in-app purchases |
| Size | 45 MB | 78 MB |
| Requires iOS | 16.6 | **16.1** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [QOOQ inc.](https://appshunter.io/developer/446639722) | [SYNCRAFT](https://appshunter.io/developer/1821469238) |

## What reviewers say

### 集中読書

[App page](https://appshunter.io/ios/app/id6759477350)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月間サブスクリプション | $1.99 | per month |
| 買い切り | $9.99 | one-time |


### SwingCat

[App page](https://appshunter.io/ios/app/swingcat-focus-timer/id6800948890)

This app uses a playful swinging cat animation to help you stay focused during study or work sessions. Complete your focus time to collect more cats and grow your virtual cat world. It offers a gamified approach to productivity and time management.

**Highlights:** Playful swinging cat animation, Collectible cats, Focus session tracking, Customizable focus duration, Detailed focus history, Gamified productivity

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

**In-app purchases:** none


## Frequently asked questions

### Is 集中読書 free?

集中読書 is free to download, with in-app purchases available.

### Is SwingCat free?

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

### Do 集中読書 or SwingCat have ads?

SwingCat shows ads; 集中読書 does not.

### Which is updated more often, 集中読書 or SwingCat?

集中読書 ships an update fortnightly, and SwingCat every 9 days. Most recently, 集中読書 was updated on October 12, 2026 and SwingCat on October 8, 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.*