# 杜杜快乐阅读4A vs 小学同步二年级

The clearest difference is in-app purchases: 杜杜快乐阅读4A at none against 小学同步二年级's 2. 杜杜快乐阅读4A also leads on iOS requirement (9.0 vs 12.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. 小学同步二年级 sells 2 one-off in-app purchases. 杜杜快乐阅读4A asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on October 16, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | 杜杜快乐阅读4A | 小学同步二年级 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Size | 154 MB | 99 MB |
| Requires iOS | **9.0** | 12.0 |
| 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) | [广州格林软件技术有限公司](https://appshunter.io/developer/1796064959) |

## 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


### 小学同步二年级

[App page](https://appshunter.io/ios/app/id1558020978)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 小学同步二年级季卡 | $5.99 | one-time |
| 小学同步二年级年卡 | $9.99 | 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 小学同步二年级 free?

小学同步二年级 is free to download, with in-app purchases available.

### Do 杜杜快乐阅读4A or 小学同步二年级 have ads?

Neither 杜杜快乐阅读4A nor 小学同步二年级 shows ads.

### Which is updated more often, 杜杜快乐阅读4A or 小学同步二年级?

杜杜快乐阅读4A ships an update every 3 months, and 小学同步二年级 every 3 months. Most recently, 杜杜快乐阅读4A was updated on October 16, 2026 and 小学同步二年级 on October 25, 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.*