# 友口 vs ROI计算

The clearest difference is in-app purchases: ROI计算 at none against 友口's 5. 友口's advantage is iOS requirement (9.0 vs 13.0). On price, ads and device support there is nothing between them.

Both are free to download. 友口 sells 5 one-off in-app purchases. ROI计算 asks for nothing beyond the download.

## The numbers

| Metric | 友口 | ROI计算 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Size | 28 MB | 70 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Heze Youkou Network Technology Co., Ltd.](https://appshunter.io/developer/1626761521) | [天门市万纺信息技术有限公司](https://appshunter.io/developer/1772867820) |

## What reviewers say

### 友口

[App page](https://appshunter.io/ios/app/id1662441586)

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 首次一小时特惠 | $1.99 | one-time |
| 一小时人工服务 | $5.99 | one-time |
| 五小时人工服务 | $20.99 | one-time |
| 十一小时人工服务 | $44.99 | one-time |
| 二十八小时人工服务 | $99.99 | one-time |


### ROI计算

[App page](https://appshunter.io/ios/app/roi/id6747033622)

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

**In-app purchases:** none


## Frequently asked questions

### Is 友口 free?

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

### Is ROI计算 free?

ROI计算 is free to download, with no in-app purchases.

### Do 友口 or ROI计算 have ads?

Neither 友口 nor ROI计算 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.*