# 集中読書 vs Attention

The clearest difference is update cadence: Attention at every 4 days against 集中読書's every 11 days. Attention also leads on device support (3 vs 1). On price, ads, in-app purchases 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 and Attention sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

集中読書 ships an update every 11 days, Attention every 4 days. The most recent releases landed on November 5, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | 集中読書 | Attention |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 11 days | **Every 4 days** |
| Size | 44 MB | 29 MB |
| Requires iOS | **16.6** | 17.0 |
| Devices | iPhone | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [QOOQ inc.](https://appshunter.io/developer/446639722) | [DAIKI MATSUI](https://appshunter.io/developer/1842952100) |

## 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 |


### Attention

[App page](https://appshunter.io/ios/app/attention-moon-study-timer/id6767784989)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 7-Day Free Trial | Free | one-time |
| Lifetime Unlock | $2.99 | one-time |


## Frequently asked questions

### Is 集中読書 free?

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

### Is Attention free?

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

### Do 集中読書 or Attention have ads?

Neither 集中読書 nor Attention shows ads.

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

集中読書 ships an update every 11 days, and Attention every 4 days. Most recently, 集中読書 was updated on November 5, 2026 and Attention on November 9, 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.*