# ボイラー技士二級 合格ドリル vs 危険物乙4 問題集

The clearest difference is in-app purchases: ボイラー技士二級 合格ドリル at none against 危険物乙4 問題集's 1. ボイラー技士二級 合格ドリル also leads on iOS requirement (15.1 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. 危険物乙4 問題集 sells 1 one-off in-app purchase. ボイラー技士二級 合格ドリル asks for nothing beyond the download.

ボイラー技士二級 合格ドリル ships an update every 4 days, 危険物乙4 問題集 weekly. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | ボイラー技士二級 合格ドリル | 危険物乙4 問題集 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Weekly |
| Size | 52 MB | 14 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [AFTW LLC](https://appshunter.io/developer/1886356149) | [RIVERSHIP](https://appshunter.io/developer/6780804499) |

## What reviewers say

### ボイラー技士二級 合格ドリル

[App page](https://appshunter.io/ios/app/id6763425772)

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

**In-app purchases:** none


### 危険物乙4 問題集

[App page](https://appshunter.io/ios/app/4/id6785840919)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 全問題アンロック | $4.99 | one-time |


## Frequently asked questions

### Is ボイラー技士二級 合格ドリル free?

ボイラー技士二級 合格ドリル is free to download, with no in-app purchases.

### Is 危険物乙4 問題集 free?

危険物乙4 問題集 is free to download, with in-app purchases available.

### Do ボイラー技士二級 合格ドリル or 危険物乙4 問題集 have ads?

Neither ボイラー技士二級 合格ドリル nor 危険物乙4 問題集 shows ads.

### Which is updated more often, ボイラー技士二級 合格ドリル or 危険物乙4 問題集?

ボイラー技士二級 合格ドリル ships an update every 4 days, and 危険物乙4 問題集 weekly. Most recently, ボイラー技士二級 合格ドリル was updated on October 25, 2026 and 危険物乙4 問題集 on October 24, 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.*