# 危険物乙4・乙種全類 一問一答問題集 vs 危険物乙4 一問一答・模試 オツスキ！

The clearest difference is ads: 危険物乙4・乙種全類 一問一答問題集 at none against 危険物乙4 一問一答・模試 オツスキ！'s shown. 危険物乙4・乙種全類 一問一答問題集 also leads on update cadence (every 5 days vs every 3 weeks). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. 危険物乙4・乙種全類 一問一答問題集 sells 1 one-off in-app purchase and 危険物乙4 一問一答・模試 オツスキ！ sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

危険物乙4・乙種全類 一問一答問題集 ships an update every 5 days, 危険物乙4 一問一答・模試 オツスキ！ every 3 weeks. The most recent releases landed on October 9, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | 危険物乙4・乙種全類 一問一答問題集 | 危険物乙4 一問一答・模試 オツスキ！ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 5 days** | Every 3 weeks |
| Size | 10 MB | 30 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Particles and Waves](https://appshunter.io/developer/1812653811) | [NAGAKAWA MASAHIKO](https://appshunter.io/developer/1872718412) |

## What reviewers say

### 危険物乙4・乙種全類 一問一答問題集

[App page](https://appshunter.io/ios/app/4/id6801183486)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro (Full Unlock) | $2.99 | one-time |


### 危険物乙4 一問一答・模試 オツスキ！

[App page](https://appshunter.io/ios/app/4/id6801225154)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアム | $2.99 | one-time |


## Frequently asked questions

### Is 危険物乙4・乙種全類 一問一答問題集 free?

危険物乙4・乙種全類 一問一答問題集 is free to download, with in-app purchases available.

### Is 危険物乙4 一問一答・模試 オツスキ！ free?

危険物乙4 一問一答・模試 オツスキ！ is free to download, with in-app purchases available.

### Do 危険物乙4・乙種全類 一問一答問題集 or 危険物乙4 一問一答・模試 オツスキ！ have ads?

危険物乙4 一問一答・模試 オツスキ！ shows ads; 危険物乙4・乙種全類 一問一答問題集 does not.

### Which is updated more often, 危険物乙4・乙種全類 一問一答問題集 or 危険物乙4 一問一答・模試 オツスキ！?

危険物乙4・乙種全類 一問一答問題集 ships an update every 5 days, and 危険物乙4 一問一答・模試 オツスキ！ every 3 weeks. Most recently, 危険物乙4・乙種全類 一問一答問題集 was updated on October 9, 2026 and 危険物乙4 一問一答・模試 オツスキ！ on October 15, 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.*