# Keep Time! vs 三十天挑战

The clearest difference is in-app purchases: 三十天挑战 at none against Keep Time!'s 1. Keep Time!'s advantage is device support. On price and iOS requirement there is nothing between them.

Both are free to download. Keep Time! sells 1 in-app purchase, starting at $1.99 per year. 三十天挑战 asks for nothing beyond the download.

## The numbers

| Metric | Keep Time! | 三十天挑战 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | — |
| Update frequency | Every 5 weeks | — |
| Size | 4 MB | 25 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | **iPhone, iPad, iPod** | — |
| Age rating | 4+ | 4+ |
| Developer | [锡蕃 林](https://appshunter.io/developer/522352724) | [Zhuhai Record Yi Technology Co.,Ltd.](https://appshunter.io/developer/1638483191) |

## What reviewers say

### Keep Time!

[App page](https://appshunter.io/ios/app/keep-time-improve-focus/id1134622897)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annually | $1.99 | per year |


### 三十天挑战

[App page](https://appshunter.io/ios/app/id6748619161)

**In-app purchases:** none


## Frequently asked questions

### Is Keep Time! free?

Keep Time! is free to download, with in-app purchases available.

### Is 三十天挑战 free?

三十天挑战 is free to download, with no in-app purchases.

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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.*