# AI先生　危険物乙４類 vs 危険物乙4 合格対策

The clearest difference is in-app purchases: AI先生　危険物乙４類 at none against 危険物乙4 合格対策's 1. 危険物乙4 合格対策's advantage is iOS requirement (13.0 vs 18.1). On price there is nothing between them.

Both are free to download. 危険物乙4 合格対策 sells 1 one-off in-app purchase. AI先生　危険物乙４類 asks for nothing beyond the download.

## The numbers

| Metric | AI先生　危険物乙４類 | 危険物乙4 合格対策 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Size | 4 MB | 132 MB |
| Requires iOS | 18.1 | **13.0** |
| Age rating | 4+ | 4+ |
| Developer | [reiko hori](https://appshunter.io/developer/1777370692) | [Jongmin Kim](https://appshunter.io/developer/1693759760) |

## 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


### 危険物乙4 合格対策

[App page](https://appshunter.io/ios/app/4/id6760637063)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告削除プレミアム | $2.99 | one-time |


## 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 危険物乙4 合格対策 free?

危険物乙4 合格対策 is free to download, with in-app purchases available.

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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.*