# 头像挂件 vs 21天计划

The clearest difference is in-app purchases: 21天计划 at none against 头像挂件's 3. 21天计划 also leads on device support and iOS requirement (12.0 vs 15.0). On price there is nothing between them.

Both are free to download. 头像挂件 sells 3 in-app purchases, starting at $0.99 per month. 21天计划 asks for nothing beyond the download.

## The numbers

| Metric | 头像挂件 | 21天计划 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | — | No |
| Size | 9 MB | 42 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | — | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [三淼 李](https://appshunter.io/developer/1812594990) | [红升 孙](https://appshunter.io/developer/1502418960) |

## What reviewers say

### 头像挂件

[App page](https://appshunter.io/ios/app/id6745531062)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月度会员 | $0.99 | per month |
| 年度会员 | $3.99 | per year |
| 永久会员 | $7.99 | one-time |


### 21天计划

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

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

**In-app purchases:** none


## Frequently asked questions

### Is 头像挂件 free?

头像挂件 is free to download, with in-app purchases available.

### Is 21天计划 free?

21天计划 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.*