# 杜杜快乐阅读1A vs 明之算课外

The clearest difference is in-app purchases: 杜杜快乐阅读1A at none against 明之算课外's 6. 杜杜快乐阅读1A also leads on ads (none vs shown). 明之算课外's advantage is update cadence (every 6 weeks vs every 5 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. 明之算课外 sells 6 one-off in-app purchases. 杜杜快乐阅读1A asks for nothing beyond the download.

杜杜快乐阅读1A ships an update every 5 months, 明之算课外 every 6 weeks. The most recent releases landed on October 26, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | 杜杜快乐阅读1A | 明之算课外 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Every 6 weeks** |
| Size | 278 MB | 28 MB |
| Requires iOS | 9.0 | 9.0 |
| 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) | [火明 蔡](https://appshunter.io/developer/1486723353) |

## What reviewers say

### 杜杜快乐阅读1A

[App page](https://appshunter.io/ios/app/1a/id923234282)

**Features:** macOS Compatibility

**In-app purchases:** none


### 明之算课外

[App page](https://appshunter.io/ios/app/id1137104767)

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 6L油量充值包 | $0.99 | one-time |
| 12L油量充值包 | $1.99 | one-time |
| 18L油量充值包 | $2.99 | one-time |
| 30L油量充值包 | $4.99 | one-time |
| 50L油量充值包 | $7.99 | one-time |
| 88L油量充值包 | $12.99 | one-time |


## Frequently asked questions

### Is 杜杜快乐阅读1A free?

杜杜快乐阅读1A is free to download, with no in-app purchases.

### Is 明之算课外 free?

明之算课外 is free to download, with in-app purchases available.

### Do 杜杜快乐阅读1A or 明之算课外 have ads?

明之算课外 shows ads; 杜杜快乐阅读1A does not.

### Which is updated more often, 杜杜快乐阅读1A or 明之算课外?

杜杜快乐阅读1A ships an update every 5 months, and 明之算课外 every 6 weeks. Most recently, 杜杜快乐阅读1A was updated on October 26, 2026 and 明之算课外 on October 10, 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.*