# AI先生　危険物乙４類 vs 高圧ガス製造保安責任者 丙種化学（特別試験科目）

The clearest difference is price: AI先生　危険物乙４類 at Free against 高圧ガス製造保安責任者 丙種化学（特別試験科目）'s $1.99. 高圧ガス製造保安責任者 丙種化学（特別試験科目）'s advantage is device support. On in-app purchases and iOS requirement there is nothing between them.

AI先生　危険物乙４類 is free to download; 高圧ガス製造保安責任者 丙種化学（特別試験科目） costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | AI先生　危険物乙４類 | 高圧ガス製造保安責任者 丙種化学（特別試験科目） |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| In-app purchases | No | No |
| Ads | — | No |
| Size | 4 MB | 5 MB |
| Requires iOS | 18.1 | **17.0** |
| Devices | — | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [reiko hori](https://appshunter.io/developer/1777370692) | [Masaki Kobayashi](https://appshunter.io/developer/1882180437) |

## What reviewers say

### AI先生　危険物乙４類

[App page](https://appshunter.io/ios/app/ai/id6738078612)

**In-app purchases:** none


### 高圧ガス製造保安責任者 丙種化学（特別試験科目）

[App page](https://appshunter.io/ios/app/id6777429981)

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

**In-app purchases:** none


## Frequently asked questions

### Is AI先生　危険物乙４類 free?

AI先生　危険物乙４類 is free to download, with no in-app purchases.

### Is 高圧ガス製造保安責任者 丙種化学（特別試験科目） free?

高圧ガス製造保安責任者 丙種化学（特別試験科目） costs $1.99, with no in-app purchases.

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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.*