# Attention vs 分贝仪噪音测试

The clearest difference is in-app purchases: 分贝仪噪音测试 at none against Attention's 1. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Attention sells 1 one-off in-app purchase. 分贝仪噪音测试 asks for nothing beyond the download.

## The numbers

| Metric | Attention | 分贝仪噪音测试 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 9 months | — |
| Size | 19 MB | 18 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [向军 贾](https://appshunter.io/developer/788691093) | [Qun Cao](https://appshunter.io/developer/1655069600) |

## What reviewers say

### Attention

[App page](https://appshunter.io/ios/app/attention-brain-training/id978324464)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock function and off AD | $2.99 | one-time |


### 分贝仪噪音测试

[App page](https://appshunter.io/ios/app/id6773730167)

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

**In-app purchases:** none


## Frequently asked questions

### Is Attention free?

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

### Is 分贝仪噪音测试 free?

分贝仪噪音测试 is free to download, with no in-app purchases.

### Do Attention or 分贝仪噪音测试 have ads?

Both Attention and 分贝仪噪音测试 show 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.*