# 数学小博士之初试牛刀 vs 九剑仙

The clearest difference is in-app purchases: 数学小博士之初试牛刀 at none against 九剑仙's 4. 数学小博士之初试牛刀 also leads on iOS requirement (12.0 vs 14.0). 九剑仙's advantage is ads (none vs shown) and update cadence (monthly vs every 13 months). On price and device support there is nothing between them.

Both are free to download. 九剑仙 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, 九剑仙 monthly. The most recent releases landed on October 18, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | 数学小博士之初试牛刀 | 九剑仙 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (18 ratings)](https://appshunter.io/ios/app/id1672202118/reviews)** |
| Number of ratings | — | **18** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 13 months | **Monthly** |
| Monetization | — | Free with in-app purchases |
| Size | 14 MB | 31 MB |
| Requires iOS | **12.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [习堂 刘](https://appshunter.io/developer/998087258) | [慧 吴](https://appshunter.io/developer/1672186914) |

## 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


### 九剑仙

[App page](https://appshunter.io/ios/app/id1672202118)

An immersive idle cultivation entertainment app with a unique Chinese fantasy martial arts world. Engage in relaxed character development, forge friendships, and break through to new levels. Discover numerous intricate gameplay mechanics in this casual, single-player experience.

**Highlights:** Immersive idle cultivation gameplay, Unique Chinese fantasy martial arts world, Relaxed character development, Social interaction with other players, Breakthrough and upgrade mechanics, Intricate gameplay systems, Single-player casual experience

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VIP1 | $0.99 | one-time |
| VIP2 | $3.99 | one-time |
| VIP3 | $14.99 | one-time |
| VIP4 | $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 九剑仙 free?

九剑仙 is free to download, with in-app purchases available.

### Do 数学小博士之初试牛刀 or 九剑仙 have ads?

数学小博士之初试牛刀 shows ads; 九剑仙 does not.

### Which is updated more often, 数学小博士之初试牛刀 or 九剑仙?

数学小博士之初试牛刀 ships an update every 13 months, and 九剑仙 monthly. Most recently, 数学小博士之初试牛刀 was updated on October 18, 2026 and 九剑仙 on September 30, 2026.

---

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