# 公害防止管理者 大気1種 問題集 vs 二級ボイラー技士・一級・特級 一問一答

公害防止管理者 大気1種 問題集 and 二級ボイラー技士・一級・特級 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. 公害防止管理者 大気1種 問題集 sells 1 one-off in-app purchase and 二級ボイラー技士・一級・特級 一問一答 sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

公害防止管理者 大気1種 問題集 ships an update every 4 days, 二級ボイラー技士・一級・特級 一問一答 every 3 days. The most recent releases landed on November 6, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | 公害防止管理者 大気1種 問題集 | 二級ボイラー技士・一級・特級 一問一答 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 days | **Every 3 days** |
| Size | 32 MB | 11 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Takuro Fukuma](https://appshunter.io/developer/1896728656) | [Particles and Waves](https://appshunter.io/developer/1812653811) |

## What reviewers say

### 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 |


### 二級ボイラー技士・一級・特級 一問一答

[App page](https://appshunter.io/ios/app/id6810931242)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Grade 2 Pro (Full Unlock) | $2.99 | one-time |
| Grade 1 Pro (Full Unlock) | $2.99 | one-time |
| Special Class Pro (Unlock) | $3.99 | one-time |


## Frequently asked questions

### 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.

### Is 二級ボイラー技士・一級・特級 一問一答 free?

二級ボイラー技士・一級・特級 一問一答 is free to download, with in-app purchases available.

### Do 公害防止管理者 大気1種 問題集 or 二級ボイラー技士・一級・特級 一問一答 have ads?

Neither 公害防止管理者 大気1種 問題集 nor 二級ボイラー技士・一級・特級 一問一答 shows ads.

### Which is updated more often, 公害防止管理者 大気1種 問題集 or 二級ボイラー技士・一級・特級 一問一答?

公害防止管理者 大気1種 問題集 ships an update every 4 days, and 二級ボイラー技士・一級・特級 一問一答 every 3 days. Most recently, 公害防止管理者 大気1種 問題集 was updated on November 6, 2026 and 二級ボイラー技士・一級・特級 一問一答 on November 8, 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.*