# Eye'sTest vs 【CO2センサー】換気エアミエル

The clearest difference is in-app purchases: 【CO2センサー】換気エアミエル at none against Eye'sTest's 1. 【CO2センサー】換気エアミエル also leads on iOS requirement (12.1 vs 16.0). Eye'sTest's advantage is device support. On price there is nothing between them.

Both are free to download. Eye'sTest sells 1 one-off in-app purchase. 【CO2センサー】換気エアミエル asks for nothing beyond the download.

## The numbers

| Metric | Eye'sTest | 【CO2センサー】換気エアミエル |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | — |
| Update frequency | Daily | — |
| Size | 6 MB | 37 MB |
| Requires iOS | 16.0 | **12.1** |
| Devices | **iPhone, iPad, Apple Watch** | — |
| Age rating | 4+ | 12+ |
| Developer | [Takeshi Kawai](https://appshunter.io/developer/428422074) | [Step One Limited](https://appshunter.io/developer/646296997) |

## What reviewers say

### Eye'sTest

[App page](https://appshunter.io/ios/app/eyestest/id539352012)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium: Measurement History | $1.99 | one-time |


### 【CO2センサー】換気エアミエル

[App page](https://appshunter.io/ios/app/co2/id1549479731)

**In-app purchases:** none


## Frequently asked questions

### Is Eye'sTest free?

Eye'sTest is free to download, with in-app purchases available.

### Is 【CO2センサー】換気エアミエル free?

【CO2センサー】換気エアミエル is free to download, with no in-app purchases.

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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.*