# 睡眠ドッグ vs 集中852

睡眠ドッグ and 集中852 are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | 睡眠ドッグ | 集中852 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | — |
| Size | 9 MB | 1 MB |
| Requires iOS | **17.0** | 18.5 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 9+ | 4+ |
| Developer | [Hayato Kitaoka](https://appshunter.io/developer/1634161426) | [Ryota Koda](https://appshunter.io/developer/1834053321) |

## What reviewers say

### 睡眠ドッグ

[App page](https://appshunter.io/ios/app/id6475922311)

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

**In-app purchases:** none


### 集中852

[App page](https://appshunter.io/ios/app/852/id6751219410)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 睡眠ドッグ free?

睡眠ドッグ is free to download, with no in-app purchases.

### Is 集中852 free?

集中852 is free to download, with no in-app purchases.

### Do 睡眠ドッグ or 集中852 have ads?

Neither 睡眠ドッグ nor 集中852 shows ads.

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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.*