# 乙4 vs 危険物乙4 過去問・問題集

The clearest difference is in-app purchases: 危険物乙4 過去問・問題集 at none against 乙4's 1. 危険物乙4 過去問・問題集 also leads on iOS requirement (13.0 vs 17.6). 乙4's advantage is ads (none vs shown). On price, update cadence and device support there is nothing between them.

Both are free to download. 乙4 sells 1 in-app purchase, starting at $4.99 per 7 days. 危険物乙4 過去問・問題集 asks for nothing beyond the download.

乙4 ships an update monthly, 危険物乙4 過去問・問題集 every 2 weeks. The most recent releases landed on October 1, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | 乙4 | 危険物乙4 過去問・問題集 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | — | Ad-supported |
| Size | 2 MB | 43 MB |
| Requires iOS | 17.6 | **13.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [CapCat LLC](https://appshunter.io/developer/1654095841) | [Naoto Baba](https://appshunter.io/developer/1445524034) |

## What reviewers say

### 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 |


### 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 乙4 free?

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

### 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 乙4 or 危険物乙4 過去問・問題集 have ads?

危険物乙4 過去問・問題集 shows ads; 乙4 does not.

### Which is updated more often, 乙4 or 危険物乙4 過去問・問題集?

乙4 ships an update monthly, and 危険物乙4 過去問・問題集 every 2 weeks. Most recently, 乙4 was updated on October 1, 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.*