# 危険物取扱者 vs 乙4

危険物取扱者 and 乙4 are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. 危険物取扱者 sells 1 one-off in-app purchase and 乙4 sells 1 in-app purchase, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | 危険物取扱者 | 乙4 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | — | Monthly |
| Size | 5 MB | 2 MB |
| Requires iOS | **16.0** | 17.6 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [TAKAYUKI OOTA](https://appshunter.io/developer/1855196437) | [CapCat LLC](https://appshunter.io/developer/1654095841) |

## What reviewers say

### 危険物取扱者

[App page](https://appshunter.io/ios/app/4/id6757994563)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 危険物取扱者（乙4） 試験対策 | $1.99 | one-time |


### 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 free?

危険物取扱者 is free to download, with in-app purchases available.

### Is 乙4 free?

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

### Do 危険物取扱者 or 乙4 have ads?

Neither 危険物取扱者 nor 乙4 shows ads.

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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.*