# 二級ボイラー技士Pass 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 二級ボイラー技士Pass's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. 二級ボイラー技士Pass 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.

二級ボイラー技士Pass ships an update weekly, うちの危険物乙4種ノート every 5 days. The most recent releases landed on September 9, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | 二級ボイラー技士Pass | うちの危険物乙4種ノート |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Weekly | **Every 5 days** |
| Size | 45 MB | 15 MB |
| Requires iOS | **15.1** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [KANDK](https://appshunter.io/developer/1867080143) | [Yutarou Nagano](https://appshunter.io/developer/6784878764) |

## What reviewers say

### 二級ボイラー技士Pass

[App page](https://appshunter.io/ios/app/pass/id6767974457)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアム | $1.99 | 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 二級ボイラー技士Pass free?

二級ボイラー技士Pass 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 二級ボイラー技士Pass or うちの危険物乙4種ノート have ads?

Both 二級ボイラー技士Pass and うちの危険物乙4種ノート show ads.

### Which is updated more often, 二級ボイラー技士Pass or うちの危険物乙4種ノート?

二級ボイラー技士Pass ships an update weekly, and うちの危険物乙4種ノート every 5 days. Most recently, 二級ボイラー技士Pass was updated on September 9, 2026 and うちの危険物乙4種ノート on September 10, 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.*