# 心流时间 vs CatchU

The clearest difference is in-app purchases: 心流时间 at none against CatchU's 1. 心流时间 also leads on iOS requirement (12.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. CatchU sells 1 one-off in-app purchase. 心流时间 asks for nothing beyond the download.

## The numbers

| Metric | 心流时间 | CatchU |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 8 days |
| Size | 39 MB | 12 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [北京动念智能科技有限公司](https://appshunter.io/developer/1781541269) | [乐 王](https://appshunter.io/developer/1879659759) |

## What reviewers say

### 心流时间

[App page](https://appshunter.io/ios/app/id6757784698)

**Features:** macOS Compatibility

**In-app purchases:** none


### CatchU

[App page](https://appshunter.io/ios/app/catchu/id6760410648)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Unlock - Unlimited Citations | $1.99 | one-time |


## Frequently asked questions

### Is 心流时间 free?

心流时间 is free to download, with no in-app purchases.

### Is CatchU free?

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

### Do 心流时间 or CatchU have ads?

Neither 心流时间 nor CatchU 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.*