# 禪修計時 vs Challenge21

The clearest difference is device support: 禪修計時 at 2 against Challenge21's —. 禪修計時 also leads on iOS requirement (9.0 vs 15.1). On price and in-app purchases there is nothing between them.

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

## The numbers

| Metric | 禪修計時 | Challenge21 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (8 ratings)](https://appshunter.io/ios/app/id914439545/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | 85.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | — |
| Update frequency | Every 2 months | — |
| Size | 120 MB | 31 MB |
| Requires iOS | **9.0** | 15.1 |
| Devices | **iPhone, iPod** | — |
| Age rating | 4+ | 4+ |
| Developer | [法鼓山香港道場](https://appshunter.io/developer/1736697210) | [Astra Zenith Ltd.](https://appshunter.io/developer/1834145226) |

## What reviewers say

### 禪修計時

[App page](https://appshunter.io/ios/app/id914439545)

**Features:** macOS Compatibility

**In-app purchases:** none


### Challenge21

[App page](https://appshunter.io/ios/app/challenge21/id6759655419)

**In-app purchases:** none


## Frequently asked questions

### Is 禪修計時 free?

禪修計時 is free to download, with no in-app purchases.

### Is Challenge21 free?

Challenge21 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.*