# 乙4 vs 危険物乙4 問題集

The clearest difference is update cadence: 危険物乙4 問題集 at weekly against 乙4's monthly. On price, ads, in-app purchases 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 and 危険物乙4 問題集 sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

乙4 ships an update monthly, 危険物乙4 問題集 weekly. The most recent releases landed on October 1, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | 乙4 | 危険物乙4 問題集 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Size | 2 MB | 14 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [CapCat LLC](https://appshunter.io/developer/1654095841) | [RIVERSHIP](https://appshunter.io/developer/6780804499) |

## 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 問題集

[App page](https://appshunter.io/ios/app/4/id6785840919)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 全問題アンロック | $4.99 | one-time |


## Frequently asked questions

### Is 乙4 free?

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

### Is 危険物乙4 問題集 free?

危険物乙4 問題集 is free to download, with in-app purchases available.

### Do 乙4 or 危険物乙4 問題集 have ads?

Neither 乙4 nor 危険物乙4 問題集 shows ads.

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

乙4 ships an update monthly, and 危険物乙4 問題集 weekly. Most recently, 乙4 was updated on October 1, 2026 and 危険物乙4 問題集 on October 11, 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.*