# 危険物取扱者 vs うちの危険物乙4種ノート

The clearest difference is in-app purchases: うちの危険物乙4種ノート at none against 危険物取扱者's 1. うちの危険物乙4種ノート also leads on update cadence (every 5 days vs every 10 months). 危険物取扱者's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. 危険物取扱者 sells 1 one-off in-app purchase. うちの危険物乙4種ノート asks for nothing beyond the download.

危険物取扱者 ships an update every 10 months, うちの危険物乙4種ノート every 5 days. The most recent releases landed on November 9, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | 危険物取扱者 | うちの危険物乙4種ノート |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 10 months | **Every 5 days** |
| Size | 5 MB | 15 MB |
| Requires iOS | 16.0 | 16.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [TAKAYUKI OOTA](https://appshunter.io/developer/1855196437) | [Yutarou Nagano](https://appshunter.io/developer/6784878764) |

## 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 | $4.99 | one-time |


### うちの危険物乙4種ノート

[App page](https://appshunter.io/ios/app/4/id6801598267)

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

**In-app purchases:** none


## 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 うちの危険物乙4種ノート free?

うちの危険物乙4種ノート is free to download, with no in-app purchases.

### Do 危険物取扱者 or うちの危険物乙4種ノート have ads?

うちの危険物乙4種ノート shows ads; 危険物取扱者 does not.

### Which is updated more often, 危険物取扱者 or うちの危険物乙4種ノート?

危険物取扱者 ships an update every 10 months, and うちの危険物乙4種ノート every 5 days. Most recently, 危険物取扱者 was updated on November 9, 2026 and うちの危険物乙4種ノート on November 2, 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.*