# 乙4 vs 電気工事士 危険物乙4 過去問 問題集 一問一答

乙4 and 電気工事士 危険物乙4 過去問 問題集 一問一答 are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases 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. 乙4 sells 1 in-app purchase, starting at $4.99 per 7 days and 電気工事士 危険物乙4 過去問 問題集 一問一答 sells 3 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

乙4 ships an update monthly, 電気工事士 危険物乙4 過去問 問題集 一問一答 every 3 weeks. The most recent releases landed on October 1, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | 乙4 | 電気工事士 危険物乙4 過去問 問題集 一問一答 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Size | 2 MB | 194 MB |
| Requires iOS | 17.6 | **16.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [CapCat LLC](https://appshunter.io/developer/1654095841) | [Shanghai Xushu Information Technology Co., Ltd.](https://appshunter.io/developer/1733615663) |

## 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 |


### 電気工事士 危険物乙4 過去問 問題集 一問一答

[App page](https://appshunter.io/ios/app/4/id6786999430)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro 月額プラン | $9.99 | per month |
| Pro 3か月プラン | $19.99 | per 3 months |
| Pro 買い切り（永久） | $39.99 | one-time |


## Frequently asked questions

### Is 乙4 free?

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

### Is 電気工事士 危険物乙4 過去問 問題集 一問一答 free?

電気工事士 危険物乙4 過去問 問題集 一問一答 is free to download, with in-app purchases available.

### Do 乙4 or 電気工事士 危険物乙4 過去問 問題集 一問一答 have ads?

Neither 乙4 nor 電気工事士 危険物乙4 過去問 問題集 一問一答 shows ads.

### Which is updated more often, 乙4 or 電気工事士 危険物乙4 過去問 問題集 一問一答?

乙4 ships an update monthly, and 電気工事士 危険物乙4 過去問 問題集 一問一答 every 3 weeks. Most recently, 乙4 was updated on October 1, 2026 and 電気工事士 危険物乙4 過去問 問題集 一問一答 on October 17, 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.*