# Kid Study vs 山姆叔叔

The clearest difference is in-app purchases: 山姆叔叔 at none against Kid Study's 5. Kid Study's advantage is update cadence (monthly vs every 13 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Kid Study sells 5 one-off in-app purchases. 山姆叔叔 asks for nothing beyond the download.

Kid Study ships an update monthly, 山姆叔叔 every 13 months. The most recent releases landed on October 7, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Kid Study | 山姆叔叔 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Monthly** | Every 13 months |
| Size | 24 MB | 194 MB |
| Requires iOS | 15.5 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jen Hsien Chen](https://appshunter.io/developer/1576491016) | [Chi Hsien Lai](https://appshunter.io/developer/1039759515) |

## What reviewers say

### Kid Study

[App page](https://appshunter.io/ios/app/kid-study/id1613678208)

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Animal Full Version | $0.99 | one-time |
| Food Full Version | $0.99 | one-time |
| Items Full Version | $0.99 | one-time |
| World, Environment & Nature Full | $0.99 | one-time |
| Full Version | $2.99 | one-time |


### 山姆叔叔

[App page](https://appshunter.io/ios/app/id6752279417)

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

**In-app purchases:** none


## Frequently asked questions

### Is Kid Study free?

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

### Is 山姆叔叔 free?

山姆叔叔 is free to download, with no in-app purchases.

### Do Kid Study or 山姆叔叔 have ads?

Neither Kid Study nor 山姆叔叔 shows ads.

### Which is updated more often, Kid Study or 山姆叔叔?

Kid Study ships an update monthly, and 山姆叔叔 every 13 months. Most recently, Kid Study was updated on October 7, 2026 and 山姆叔叔 on October 24, 2026.

---

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