# 集中読書 vs Focus Mirror

The clearest difference is ads: 集中読書 at none against Focus Mirror's shown. Focus Mirror's advantage is update cadence (every 5 days vs fortnightly) and device support (3 vs 1). On price, 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 Focus Mirror sells 3 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

集中読書 ships an update fortnightly, Focus Mirror every 5 days. The most recent releases landed on October 12, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | 集中読書 | Focus Mirror |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Fortnightly | **Every 5 days** |
| Size | 45 MB | 8 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) | [Takahiro Kimura](https://appshunter.io/developer/6775796488) |

## 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 |


### Focus Mirror

[App page](https://appshunter.io/ios/app/focus-mirror-study-timer/id6815692837)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads Monthly Plan | $0.99 | per month |
| Remove Ads Yearly Plan | $9.99 | per year |
| Remove Ads Lifetime | $39.99 | 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 Focus Mirror free?

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

### Do 集中読書 or Focus Mirror have ads?

Focus Mirror shows ads; 集中読書 does not.

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

集中読書 ships an update fortnightly, and Focus Mirror every 5 days. Most recently, 集中読書 was updated on October 12, 2026 and Focus Mirror on October 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.*