# MZD数字钥匙 vs AI绘本库

The clearest difference is update cadence: AI绘本库 at every 3 weeks against MZD数字钥匙's every 3 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

MZD数字钥匙 ships an update every 3 months, AI绘本库 every 3 weeks. The most recent releases landed on October 16, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | MZD数字钥匙 | AI绘本库 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Size | 36 MB | 95 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [USTL Internet of Things Co., Ltd.](https://appshunter.io/developer/1494250730) | [汉光 杨](https://appshunter.io/developer/1611145104) |

## What reviewers say

### MZD数字钥匙

[App page](https://appshunter.io/ios/app/mzd/id1669684270)

**Features:** macOS Compatibility

**In-app purchases:** none


### AI绘本库

[App page](https://appshunter.io/ios/app/ai-ai/id6745256933)

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

**In-app purchases:** none


## Frequently asked questions

### Is MZD数字钥匙 free?

MZD数字钥匙 is free to download, with no in-app purchases.

### Is AI绘本库 free?

AI绘本库 is free to download, with no in-app purchases.

### Do MZD数字钥匙 or AI绘本库 have ads?

Neither MZD数字钥匙 nor AI绘本库 shows ads.

### Which is updated more often, MZD数字钥匙 or AI绘本库?

MZD数字钥匙 ships an update every 3 months, and AI绘本库 every 3 weeks. Most recently, MZD数字钥匙 was updated on October 16, 2026 and AI绘本库 on October 30, 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.*