# 丫丫认知大全 vs Kid Study

The clearest difference is in-app purchases: 丫丫认知大全 at none against Kid Study's 5. 丫丫认知大全 also leads on iOS requirement (11.0 vs 15.5). Kid Study's advantage is ads (none vs shown) and update cadence (monthly vs every 49 months). On price and device support there is nothing between them.

Both are free to download. Kid Study sells 5 one-off in-app purchases. 丫丫认知大全 asks for nothing beyond the download.

丫丫认知大全 ships an update every 49 months, Kid Study monthly. The most recent releases landed on October 14, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | 丫丫认知大全 | Kid Study |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 49 months | **Monthly** |
| Size | 18 MB | 24 MB |
| Requires iOS | **11.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [路霞 代](https://appshunter.io/developer/985101043) | [Jen Hsien Chen](https://appshunter.io/developer/1576491016) |

## What reviewers say

### 丫丫认知大全

[App page](https://appshunter.io/ios/app/id985101044)

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

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is 丫丫认知大全 free?

丫丫认知大全 is free to download, with no in-app purchases.

### Is Kid Study free?

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

### Do 丫丫认知大全 or Kid Study have ads?

丫丫认知大全 shows ads; Kid Study does not.

### Which is updated more often, 丫丫认知大全 or Kid Study?

丫丫认知大全 ships an update every 49 months, and Kid Study monthly. Most recently, 丫丫认知大全 was updated on October 14, 2026 and Kid Study on October 7, 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.*