# AI先生　危険物乙４類 vs 2級ボイラー技士

The clearest difference is in-app purchases: AI先生　危険物乙４類 at none against 2級ボイラー技士's 1. 2級ボイラー技士's advantage is device support and iOS requirement (16.0 vs 18.1). On price there is nothing between them.

Both are free to download. 2級ボイラー技士 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 | 2級ボイラー技士 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | — | No |
| Size | 4 MB | 5 MB |
| Requires iOS | 18.1 | **16.0** |
| Devices | — | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [reiko hori](https://appshunter.io/developer/1777370692) | [TAKAYUKI OOTA](https://appshunter.io/developer/1855196437) |

## 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


### 2級ボイラー技士

[App page](https://appshunter.io/ios/app/2/id6757114326)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 2級ボイラー技士 試験対策 | $1.99 | 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 2級ボイラー技士 free?

2級ボイラー技士 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.*