# 数学小博士之初试牛刀 vs 七乐

The clearest difference is in-app purchases: 数学小博士之初试牛刀 at none against 七乐's 4. 数学小博士之初试牛刀 also leads on device support (3 vs 1) and iOS requirement (12.0 vs 16.1). 七乐's advantage is ads (none vs shown) and update cadence (every 3 days vs every 13 months). On price there is nothing between them.

Both are free to download. 七乐 sells 4 one-off in-app purchases. 数学小博士之初试牛刀 asks for nothing beyond the download.

数学小博士之初试牛刀 ships an update every 13 months, 七乐 every 3 days. The most recent releases landed on October 18, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | 数学小博士之初试牛刀 | 七乐 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 13 months | **Every 3 days** |
| Size | 14 MB | 192 MB |
| Requires iOS | **12.0** | 16.1 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [习堂 刘](https://appshunter.io/developer/998087258) | [郑州七云科技有限公司](https://appshunter.io/developer/1801401595) |

## What reviewers say

### 数学小博士之初试牛刀

[App page](https://appshunter.io/ios/app/id1024285199)

**Features:** macOS Compatibility

**In-app purchases:** none


### 七乐

[App page](https://appshunter.io/ios/app/id6777908206)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 周卡 | $0.99 | one-time |
| 月卡 | $3.99 | one-time |
| 季卡 | $8.99 | one-time |
| 年卡 | $29.99 | one-time |


## Frequently asked questions

### Is 数学小博士之初试牛刀 free?

数学小博士之初试牛刀 is free to download, with no in-app purchases.

### Is 七乐 free?

七乐 is free to download, with in-app purchases available.

### Do 数学小博士之初试牛刀 or 七乐 have ads?

数学小博士之初试牛刀 shows ads; 七乐 does not.

### Which is updated more often, 数学小博士之初试牛刀 or 七乐?

数学小博士之初试牛刀 ships an update every 13 months, and 七乐 every 3 days. Most recently, 数学小博士之初试牛刀 was updated on October 18, 2026 and 七乐 on October 24, 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.*