# Study Clock vs 集中の木

The clearest difference is in-app purchases: 集中の木 at none against Study Clock's 1. 集中の木 also leads on ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Study Clock sells 1 one-off in-app purchase. 集中の木 asks for nothing beyond the download.

## The numbers

| Metric | Study Clock | 集中の木 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 4 weeks | — |
| Size | 28 MB | 38 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SnowdropSoft](https://appshunter.io/developer/1541796403) | [kizuna yoshihara](https://appshunter.io/developer/1807732321) |

## What reviewers say

### Study Clock

[App page](https://appshunter.io/ios/app/study-clock-deep-focus-timer/id6756950093)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


### 集中の木

[App page](https://appshunter.io/ios/app/zentree/id6758343120)

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

**In-app purchases:** none


## Frequently asked questions

### Is Study Clock free?

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

### Is 集中の木 free?

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

### Do Study Clock or 集中の木 have ads?

Study Clock shows ads; 集中の木 does not.

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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.*