# 危険物取扱者乙種第4類2023年対策アプリ vs 乙4

The clearest difference is in-app purchases: 危険物取扱者乙種第4類2023年対策アプリ at none against 乙4's 1. 危険物取扱者乙種第4類2023年対策アプリ also leads on device support (3 vs 1) and iOS requirement (11.0 vs 17.6). 乙4's advantage is ads (none vs shown) and update cadence (monthly vs every 3 months). On price there is nothing between them.

Both are free to download. 乙4 sells 1 in-app purchase, starting at $4.99 per 7 days. 危険物取扱者乙種第4類2023年対策アプリ asks for nothing beyond the download.

危険物取扱者乙種第4類2023年対策アプリ ships an update every 3 months, 乙4 monthly. The most recent releases landed on October 25, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | 危険物取扱者乙種第4類2023年対策アプリ | 乙4 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Monthly** |
| Size | 34 MB | 2 MB |
| Requires iOS | **11.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [YUZUKI SUDA](https://appshunter.io/developer/1548626646) | [CapCat LLC](https://appshunter.io/developer/1654095841) |

## What reviewers say

### 危険物取扱者乙種第4類2023年対策アプリ

[App page](https://appshunter.io/ios/app/42023/id1554186534)

**Features:** macOS Compatibility

**In-app purchases:** none


### 乙4

[App page](https://appshunter.io/ios/app/4-4-2026/id6764290217)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 無料でお試しする | $4.99 | per 7 days |


## Frequently asked questions

### Is 危険物取扱者乙種第4類2023年対策アプリ free?

危険物取扱者乙種第4類2023年対策アプリ is free to download, with no in-app purchases.

### Is 乙4 free?

乙4 is free to download, with in-app purchases available.

### Do 危険物取扱者乙種第4類2023年対策アプリ or 乙4 have ads?

危険物取扱者乙種第4類2023年対策アプリ shows ads; 乙4 does not.

### Which is updated more often, 危険物取扱者乙種第4類2023年対策アプリ or 乙4?

危険物取扱者乙種第4類2023年対策アプリ ships an update every 3 months, and 乙4 monthly. Most recently, 危険物取扱者乙種第4類2023年対策アプリ was updated on October 25, 2026 and 乙4 on October 31, 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.*