# ClearS vs 大気関係第３種

The clearest difference is in-app purchases: ClearS at none against 大気関係第３種's 1. ClearS also leads on iOS requirement (9.1 vs 16.0). On price, ads and device support there is nothing between them.

Both are free to download. 大気関係第３種 sells 1 one-off in-app purchase. ClearS asks for nothing beyond the download.

## The numbers

| Metric | ClearS | 大気関係第３種 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 days | — |
| Size | 59 MB | 5 MB |
| Requires iOS | **9.1** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [CLEAR, K.K.](https://appshunter.io/developer/778299371) | [TAKAYUKI OOTA](https://appshunter.io/developer/1855196437) |

## What reviewers say

### ClearS

[App page](https://appshunter.io/ios/app/clears/id1289584035)

**In-app purchases:** none


### 大気関係第３種

[App page](https://appshunter.io/ios/app/id6758421053)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 大気関係第３種公害防止管理者 試験対策 | $1.99 | one-time |


## Frequently asked questions

### Is ClearS free?

ClearS is free to download, with no in-app purchases.

### Is 大気関係第３種 free?

大気関係第３種 is free to download, with in-app purchases available.

### Do ClearS or 大気関係第３種 have ads?

Neither ClearS nor 大気関係第３種 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.*