# 水質関係第４種 vs 公害防止管理者 水質1種 合格ナビ

水質関係第４種 and 公害防止管理者 水質1種 合格ナビ are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support 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. 水質関係第４種 sells 1 one-off in-app purchase and 公害防止管理者 水質1種 合格ナビ sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | 水質関係第４種 | 公害防止管理者 水質1種 合格ナビ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | — | Every 8 days |
| Size | 5 MB | 3 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [TAKAYUKI OOTA](https://appshunter.io/developer/1855196437) | [Shunya Iwasaki](https://appshunter.io/developer/1796095304) |

## What reviewers say

### 水質関係第４種

[App page](https://appshunter.io/ios/app/id6758494591)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 水質関係第４種公害防止管理者 試験対策 | $1.99 | one-time |


### 公害防止管理者 水質1種 合格ナビ

[App page](https://appshunter.io/ios/app/1/id6772624961)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 実戦問題パック 2026 | $3.99 | one-time |
| プレミアム（全機能解放） | $14.99 | one-time |


## Frequently asked questions

### Is 水質関係第４種 free?

水質関係第４種 is free to download, with in-app purchases available.

### Is 公害防止管理者 水質1種 合格ナビ free?

公害防止管理者 水質1種 合格ナビ is free to download, with in-app purchases available.

### Do 水質関係第４種 or 公害防止管理者 水質1種 合格ナビ have ads?

Neither 水質関係第４種 nor 公害防止管理者 水質1種 合格ナビ shows ads.

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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.*