# 【CO2センサー】換気エアミエル vs Posture Trainer

The clearest difference is in-app purchases: 【CO2センサー】換気エアミエル at none against Posture Trainer's 3. 【CO2センサー】換気エアミエル also leads on iOS requirement (12.1 vs 17.0). On price there is nothing between them.

Both are free to download. Posture Trainer sells 3 in-app purchases, starting at $6.99 per 7 days. 【CO2センサー】換気エアミエル asks for nothing beyond the download.

## The numbers

| Metric | 【CO2センサー】換気エアミエル | Posture Trainer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | — | No |
| Update frequency | — | Monthly |
| Size | 37 MB | 13 MB |
| Requires iOS | **12.1** | 17.0 |
| Devices | — | **iPhone** |
| Age rating | 12+ | 4+ |
| Developer | [Step One Limited](https://appshunter.io/developer/646296997) | [Phuc Pham](https://appshunter.io/developer/1893081423) |

## What reviewers say

### 【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


### Posture Trainer

[App page](https://appshunter.io/ios/app/posture-trainer-sit-straight/id6772211099)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $6.99 | per 7 days |
| Yearly | $34.99 | per year |
| Lifetime Pro | $69.99 | one-time |


## Frequently asked questions

### 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.

### Is Posture Trainer free?

Posture Trainer is free to download, with in-app purchases available.

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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.*