# 2級ボイラー技士問題集lite　りすさんシリーズ vs オツスキ！：仕事の合間で受かる乙4

The clearest difference is in-app purchases: 2級ボイラー技士問題集lite　りすさんシリーズ at none against オツスキ！：仕事の合間で受かる乙4's 1. 2級ボイラー技士問題集lite　りすさんシリーズ also leads on ads (none vs shown). オツスキ！：仕事の合間で受かる乙4's advantage is update cadence (daily vs every 16 months) and iOS requirement (15.0 vs 18.6). On price and device support there is nothing between them.

Both are free to download. オツスキ！：仕事の合間で受かる乙4 sells 1 one-off in-app purchase. 2級ボイラー技士問題集lite　りすさんシリーズ asks for nothing beyond the download.

2級ボイラー技士問題集lite　りすさんシリーズ ships an update every 16 months, オツスキ！：仕事の合間で受かる乙4 daily. The most recent releases landed on September 22, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | 2級ボイラー技士問題集lite　りすさんシリーズ | オツスキ！：仕事の合間で受かる乙4 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 16 months | **Daily** |
| Size | 5 MB | 30 MB |
| Requires iOS | 18.6 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kazuki Baba](https://appshunter.io/developer/903350438) | [NAGAKAWA MASAHIKO](https://appshunter.io/developer/1872718412) |

## What reviewers say

### 2級ボイラー技士問題集lite　りすさんシリーズ

[App page](https://appshunter.io/ios/app/2lite/id907765542)

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

**In-app purchases:** none


### 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 2級ボイラー技士問題集lite　りすさんシリーズ free?

2級ボイラー技士問題集lite　りすさんシリーズ is free to download, with no in-app purchases.

### 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 2級ボイラー技士問題集lite　りすさんシリーズ or オツスキ！：仕事の合間で受かる乙4 have ads?

オツスキ！：仕事の合間で受かる乙4 shows ads; 2級ボイラー技士問題集lite　りすさんシリーズ does not.

### Which is updated more often, 2級ボイラー技士問題集lite　りすさんシリーズ or オツスキ！：仕事の合間で受かる乙4?

2級ボイラー技士問題集lite　りすさんシリーズ ships an update every 16 months, and オツスキ！：仕事の合間で受かる乙4 daily. Most recently, 2級ボイラー技士問題集lite　りすさんシリーズ was updated on September 22, 2026 and オツスキ！：仕事の合間で受かる乙4 on September 20, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*