# 杜杜快乐阅读4A vs 数方

The clearest difference is in-app purchases: 杜杜快乐阅读4A at none against 数方's 3. 杜杜快乐阅读4A also leads on ads (none vs shown) and iOS requirement (9.0 vs 13.0). On price, update cadence and device support there is nothing between them.

Both are free to download. 数方 sells 3 one-off in-app purchases. 杜杜快乐阅读4A asks for nothing beyond the download.

杜杜快乐阅读4A ships an update every 3 months, 数方 every 2 months. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | 杜杜快乐阅读4A | 数方 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 2 months** |
| Size | 154 MB | 40 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [长沙市星灿软件开发有限公司](https://appshunter.io/developer/1126375430) | [杭州家之馨电子商务有限公司](https://appshunter.io/developer/1641228139) |

## What reviewers say

### 杜杜快乐阅读4A

[App page](https://appshunter.io/ios/app/4a/id1129812218)

**Features:** macOS Compatibility

**In-app purchases:** none


### 数方

[App page](https://appshunter.io/ios/app/id6462990371)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月度会员 | $4.99 | one-time |
| 半年会员 | $7.99 | one-time |
| 年度会员 | $11.99 | one-time |


## Frequently asked questions

### Is 杜杜快乐阅读4A free?

杜杜快乐阅读4A is free to download, with no in-app purchases.

### Is 数方 free?

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

### Do 杜杜快乐阅读4A or 数方 have ads?

数方 shows ads; 杜杜快乐阅读4A does not.

### Which is updated more often, 杜杜快乐阅读4A or 数方?

杜杜快乐阅读4A ships an update every 3 months, and 数方 every 2 months. Most recently, 杜杜快乐阅读4A was updated on October 26, 2026 and 数方 on October 27, 2026.

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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.*