# 发票助手 vs 打字练习

The clearest difference is in-app purchases: 打字练习 at none against 发票助手's 3. 打字练习 also leads on device support. On price and iOS requirement there is nothing between them.

Both are free to download. 发票助手 sells 3 in-app purchases, starting at $2.99 per month. 打字练习 asks for nothing beyond the download.

## The numbers

| Metric | 发票助手 | 打字练习 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | — | Yes |
| Update frequency | — | Every 2 days |
| Size | 24 MB | 17 MB |
| Requires iOS | **15.6** | 16 |
| Devices | — | **iPhone, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [应习 黄](https://appshunter.io/developer/1618173120) | [志雄 黄](https://appshunter.io/developer/1877111087) |

## What reviewers say

### 发票助手

[App page](https://appshunter.io/ios/app/ocr/id6651826202)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 发票助手月度会员高级账户 | $2.99 | per month |
| 发票助手季度会员高级账户 | $3.99 | per 3 months |
| 发票助手年度会员高级账户 | $4.99 | per year |


### 打字练习

[App page](https://appshunter.io/ios/app/id6759860730)

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

**In-app purchases:** none


## Frequently asked questions

### Is 发票助手 free?

发票助手 is free to download, with in-app purchases available.

### Is 打字练习 free?

打字练习 is free to download, with no in-app purchases.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*