# Attention vs 嘀友好司机

The clearest difference is in-app purchases: 嘀友好司机 at none against Attention's 1. 嘀友好司机 also leads on ads (none vs shown) and iOS requirement (9.0 vs 12.0). On price and device support there is nothing between them.

Both are free to download. Attention sells 1 one-off in-app purchase. 嘀友好司机 asks for nothing beyond the download.

## The numbers

| Metric | Attention | 嘀友好司机 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 9 months | — |
| Size | 19 MB | 20 MB |
| Requires iOS | 12.0 | **9.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [向军 贾](https://appshunter.io/developer/788691093) | [上海嘀友网络科技有限公司](https://appshunter.io/developer/1087699404) |

## 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 |


### 嘀友好司机

[App page](https://appshunter.io/ios/app/id1460088065)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Attention free?

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

### Is 嘀友好司机 free?

嘀友好司机 is free to download, with no in-app purchases.

### Do Attention or 嘀友好司机 have ads?

Attention shows ads; 嘀友好司机 does not.

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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.*