# AI先生　危険物乙４類 vs 二級ボイラー技士Pass

The clearest difference is in-app purchases: AI先生　危険物乙４類 at none against 二級ボイラー技士Pass's 1. 二級ボイラー技士Pass's advantage is device support and iOS requirement (15.1 vs 18.1). On price there is nothing between them.

Both are free to download. 二級ボイラー技士Pass 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 | 二級ボイラー技士Pass |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | — | Yes |
| Update frequency | — | Weekly |
| Size | 4 MB | 45 MB |
| Requires iOS | 18.1 | **15.1** |
| Devices | — | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [reiko hori](https://appshunter.io/developer/1777370692) | [KANDK](https://appshunter.io/developer/1867080143) |

## 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


### 二級ボイラー技士Pass

[App page](https://appshunter.io/ios/app/pass/id6767974457)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアム | $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 二級ボイラー技士Pass free?

二級ボイラー技士Pass 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.*