# 危険物取扱者乙種第四類 vs 危険物乙4 過去問・問題集

The clearest difference is review sentiment: 危険物取扱者乙種第四類 at 55% against 危険物乙4 過去問・問題集's 0%. 危険物乙4 過去問・問題集's advantage is update cadence (every 2 weeks vs every 2 months). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

危険物取扱者乙種第四類 ships an update every 2 months, 危険物乙4 過去問・問題集 every 2 weeks. The most recent releases landed on October 11, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | 危険物取扱者乙種第四類 | 危険物乙4 過去問・問題集 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | **55.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | — | Ad-supported |
| Size | 13 MB | 43 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Maiji Saito](https://appshunter.io/developer/671719488) | [Naoto Baba](https://appshunter.io/developer/1445524034) |

## What reviewers say

### 危険物取扱者乙種第四類

[App page](https://appshunter.io/ios/app/id671719485)

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

**In-app purchases:** none


### 危険物乙4 過去問・問題集

[App page](https://appshunter.io/ios/app/4/id6766231307)

This app helps you prepare for the Class B, Type 4 hazardous materials handler exam. It offers practice questions, targeted drills, and mock tests to support self-study and efficient learning during your commute or breaks.

**Highlights:** Past exam questions and explanations, Subject-specific practice, Weakness review, Mock exams, Study history visualization, Bookmarks, Dark mode

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

**In-app purchases:** none


## Frequently asked questions

### Is 危険物取扱者乙種第四類 free?

危険物取扱者乙種第四類 is free to download, with no in-app purchases.

### Is 危険物乙4 過去問・問題集 free?

危険物乙4 過去問・問題集 is free to download, with no in-app purchases.

### Do 危険物取扱者乙種第四類 or 危険物乙4 過去問・問題集 have ads?

Both 危険物取扱者乙種第四類 and 危険物乙4 過去問・問題集 show ads.

### Which is updated more often, 危険物取扱者乙種第四類 or 危険物乙4 過去問・問題集?

危険物取扱者乙種第四類 ships an update every 2 months, and 危険物乙4 過去問・問題集 every 2 weeks. Most recently, 危険物取扱者乙種第四類 was updated on October 11, 2026 and 危険物乙4 過去問・問題集 on October 12, 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.*