# 1級ボイラー技士 vs 公害防止管理者 大気1種 問題集

The clearest difference is update cadence: 公害防止管理者 大気1種 問題集 at every 4 days against 1級ボイラー技士's every 8 days. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 1級ボイラー技士 sells 1 one-off in-app purchase and 公害防止管理者 大気1種 問題集 sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

1級ボイラー技士 ships an update every 8 days, 公害防止管理者 大気1種 問題集 every 4 days. The most recent releases landed on October 13, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | 1級ボイラー技士 | 公害防止管理者 大気1種 問題集 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 8 days | **Every 4 days** |
| Size | 5 MB | 32 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [TAKAYUKI OOTA](https://appshunter.io/developer/1855196437) | [Takuro Fukuma](https://appshunter.io/developer/1896728656) |

## What reviewers say

### 1級ボイラー技士

[App page](https://appshunter.io/ios/app/1/id6757117093)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1級ボイラー技士 試験対策 | $1.99 | one-time |


### 公害防止管理者 大気1種 問題集

[App page](https://appshunter.io/ios/app/1/id6800551667)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 全問解放（買い切り） | $6.99 | one-time |


## Frequently asked questions

### Is 1級ボイラー技士 free?

1級ボイラー技士 is free to download, with in-app purchases available.

### Is 公害防止管理者 大気1種 問題集 free?

公害防止管理者 大気1種 問題集 is free to download, with in-app purchases available.

### Do 1級ボイラー技士 or 公害防止管理者 大気1種 問題集 have ads?

Neither 1級ボイラー技士 nor 公害防止管理者 大気1種 問題集 shows ads.

### Which is updated more often, 1級ボイラー技士 or 公害防止管理者 大気1種 問題集?

1級ボイラー技士 ships an update every 8 days, and 公害防止管理者 大気1種 問題集 every 4 days. Most recently, 1級ボイラー技士 was updated on October 13, 2026 and 公害防止管理者 大気1種 問題集 on September 30, 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.*