# 21天计划 vs 刻度Scale

The clearest difference is price: 21天计划 at Free against 刻度Scale's $0.99. 21天计划 also leads on iOS requirement (12.0 vs 17.6). On ads, in-app purchases and device support there is nothing between them.

21天计划 is free to download; 刻度Scale costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | 21天计划 | 刻度Scale |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Weekly |
| Size | 42 MB | 3 MB |
| Requires iOS | **12.0** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [红升 孙](https://appshunter.io/developer/1502418960) | [浚羿 王](https://appshunter.io/developer/1854984027) |

## What reviewers say

### 21天计划

[App page](https://appshunter.io/ios/app/21/id6754164973)

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

**In-app purchases:** none


### 刻度Scale

[App page](https://appshunter.io/ios/app/scale/id6756906841)

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

**In-app purchases:** none


## Frequently asked questions

### Is 21天计划 free?

21天计划 is free to download, with no in-app purchases.

### Is 刻度Scale free?

刻度Scale costs $0.99, with no in-app purchases.

### Do 21天计划 or 刻度Scale have ads?

Neither 21天计划 nor 刻度Scale 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.*