# 二級ボイラー技士＜対策シリーズ＞ vs オツスキ！：仕事の合間で受かる乙4

The clearest difference is update cadence: オツスキ！：仕事の合間で受かる乙4 at daily against 二級ボイラー技士＜対策シリーズ＞'s weekly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 二級ボイラー技士＜対策シリーズ＞ sells 1 one-off in-app purchase and オツスキ！：仕事の合間で受かる乙4 sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

二級ボイラー技士＜対策シリーズ＞ ships an update weekly, オツスキ！：仕事の合間で受かる乙4 daily. The most recent releases landed on September 12, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | 二級ボイラー技士＜対策シリーズ＞ | オツスキ！：仕事の合間で受かる乙4 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Weekly | **Daily** |
| Size | 106 MB | 30 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Katsuhisa Irie](https://appshunter.io/developer/1592415462) | [NAGAKAWA MASAHIKO](https://appshunter.io/developer/1872718412) |

## What reviewers say

### 二級ボイラー技士＜対策シリーズ＞

[App page](https://appshunter.io/ios/app/id6737748481)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告非表示 | $3.99 | one-time |


### オツスキ！：仕事の合間で受かる乙4

[App page](https://appshunter.io/ios/app/4/id6801225154)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアム | $2.99 | one-time |


## Frequently asked questions

### Is 二級ボイラー技士＜対策シリーズ＞ free?

二級ボイラー技士＜対策シリーズ＞ is free to download, with in-app purchases available.

### Is オツスキ！：仕事の合間で受かる乙4 free?

オツスキ！：仕事の合間で受かる乙4 is free to download, with in-app purchases available.

### Do 二級ボイラー技士＜対策シリーズ＞ or オツスキ！：仕事の合間で受かる乙4 have ads?

Both 二級ボイラー技士＜対策シリーズ＞ and オツスキ！：仕事の合間で受かる乙4 show ads.

### Which is updated more often, 二級ボイラー技士＜対策シリーズ＞ or オツスキ！：仕事の合間で受かる乙4?

二級ボイラー技士＜対策シリーズ＞ ships an update weekly, and オツスキ！：仕事の合間で受かる乙4 daily. Most recently, 二級ボイラー技士＜対策シリーズ＞ was updated on September 12, 2026 and オツスキ！：仕事の合間で受かる乙4 on September 20, 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.*