# 危険物乙4 合格ドリル vs 自主保全士 2級 | 2026年対策問題

The clearest difference is price: 危険物乙4 合格ドリル at Free against 自主保全士 2級 | 2026年対策問題's $2.99. 危険物乙4 合格ドリル also leads on update cadence (weekly vs every 5 months) and iOS requirement (15.1 vs 17.0). 自主保全士 2級 | 2026年対策問題's advantage is ads (none vs shown). On in-app purchases and device support there is nothing between them.

危険物乙4 合格ドリル is free to download; 自主保全士 2級 | 2026年対策問題 costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

危険物乙4 合格ドリル ships an update weekly, 自主保全士 2級 | 2026年対策問題 every 5 months. The most recent releases landed on October 11, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | 危険物乙4 合格ドリル | 自主保全士 2級 | 2026年対策問題 |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 5 months |
| Size | 53 MB | 5 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) | [Masaki Kobayashi](https://appshunter.io/developer/1882180437) |

## What reviewers say

### 危険物乙4 合格ドリル

[App page](https://appshunter.io/ios/app/4/id6761160536)

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

**In-app purchases:** none


### 自主保全士 2級 | 2026年対策問題

[App page](https://appshunter.io/ios/app/2-2026/id6777914623)

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

**In-app purchases:** none


## Frequently asked questions

### Is 危険物乙4 合格ドリル free?

危険物乙4 合格ドリル is free to download, with no in-app purchases.

### Is 自主保全士 2級 | 2026年対策問題 free?

自主保全士 2級 | 2026年対策問題 costs $2.99, with no in-app purchases.

### Do 危険物乙4 合格ドリル or 自主保全士 2級 | 2026年対策問題 have ads?

危険物乙4 合格ドリル shows ads; 自主保全士 2級 | 2026年対策問題 does not.

### Which is updated more often, 危険物乙4 合格ドリル or 自主保全士 2級 | 2026年対策問題?

危険物乙4 合格ドリル ships an update weekly, and 自主保全士 2級 | 2026年対策問題 every 5 months. Most recently, 危険物乙4 合格ドリル was updated on October 11, 2026 and 自主保全士 2級 | 2026年対策問題 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.*