# 水質関係第４種 vs 公害防止管理者水質4種対策

The clearest difference is price: 水質関係第４種 at Free against 公害防止管理者水質4種対策's $4.99. 公害防止管理者水質4種対策's advantage is in-app purchases (none vs 1). On ads, device support and iOS requirement there is nothing between them.

水質関係第４種 is free to download; 公害防止管理者水質4種対策 costs $4.99 up front. 水質関係第４種 sells 1 one-off in-app purchase. 公害防止管理者水質4種対策 asks for nothing beyond the download.

## The numbers

| Metric | 水質関係第４種 | 公害防止管理者水質4種対策 |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | — | Monthly |
| Size | 5 MB | 34 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [TAKAYUKI OOTA](https://appshunter.io/developer/1855196437) | [satoshi yoshida](https://appshunter.io/developer/1873856165) |

## 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4種対策

[App page](https://appshunter.io/ios/app/4/id6775329695)

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

**In-app purchases:** none


## 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4種対策 free?

公害防止管理者水質4種対策 costs $4.99, with no in-app purchases.

### Do 水質関係第４種 or 公害防止管理者水質4種対策 have ads?

Neither 水質関係第４種 nor 公害防止管理者水質4種対策 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.*