# 危険物乙4 問題集 vs 危険物取扱者甲/丙/乙1〜6類・消防設備士甲4/乙6 対策

The clearest difference is iOS requirement: 危険物取扱者甲/丙/乙1〜6類・消防設備士甲4/乙6 対策 at 15.1 against 危険物乙4 問題集's 17.0. On price, update cadence, ads and in-app purchases 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 and 危険物取扱者甲/丙/乙1〜6類・消防設備士甲4/乙6 対策 sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

危険物乙4 問題集 ships an update every 8 days, 危険物取扱者甲/丙/乙1〜6類・消防設備士甲4/乙6 対策 every 2 weeks. The most recent releases landed on November 5, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | 危険物乙4 問題集 | 危険物取扱者甲/丙/乙1〜6類・消防設備士甲4/乙6 対策 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 8 days** | Every 2 weeks |
| Size | 14 MB | 76 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [RIVERSHIP](https://appshunter.io/developer/6780804499) | [CHOI SEONGMIN](https://appshunter.io/developer/6772332527) |

## What reviewers say

### 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 |


### 危険物取扱者甲/丙/乙1〜6類・消防設備士甲4/乙6 対策

[App page](https://appshunter.io/ios/app/1646/id6795147917)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 永久利用権 | $3.49 | one-time |


## Frequently asked questions

### 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.

### Is 危険物取扱者甲/丙/乙1〜6類・消防設備士甲4/乙6 対策 free?

危険物取扱者甲/丙/乙1〜6類・消防設備士甲4/乙6 対策 is free to download, with in-app purchases available.

### Do 危険物乙4 問題集 or 危険物取扱者甲/丙/乙1〜6類・消防設備士甲4/乙6 対策 have ads?

Neither 危険物乙4 問題集 nor 危険物取扱者甲/丙/乙1〜6類・消防設備士甲4/乙6 対策 shows ads.

### Which is updated more often, 危険物乙4 問題集 or 危険物取扱者甲/丙/乙1〜6類・消防設備士甲4/乙6 対策?

危険物乙4 問題集 ships an update every 8 days, and 危険物取扱者甲/丙/乙1〜6類・消防設備士甲4/乙6 対策 every 2 weeks. Most recently, 危険物乙4 問題集 was updated on November 5, 2026 and 危険物取扱者甲/丙/乙1〜6類・消防設備士甲4/乙6 対策 on November 4, 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.*