# ワイヤレスCO2モニター vs 差圧チェッカー

The clearest difference is update cadence: 差圧チェッカー at every 3 months against ワイヤレスCO2モニター's every 11 months. ワイヤレスCO2モニター's advantage is iOS requirement (8.0 vs 13.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ワイヤレスCO2モニター ships an update every 11 months, 差圧チェッカー every 3 months. The most recent releases landed on September 10, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | ワイヤレスCO2モニター | 差圧チェッカー |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 3 months** |
| Size | 4 MB | 17 MB |
| Requires iOS | **8.0** | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Step One Limited](https://appshunter.io/developer/646296997) | [Ryonetsu Kogyou co.,ltd.](https://appshunter.io/developer/887824730) |

## What reviewers say

### ワイヤレスCO2モニター

[App page](https://appshunter.io/ios/app/co2/id1162038614)

**Features:** macOS Compatibility

**In-app purchases:** none


### 差圧チェッカー

[App page](https://appshunter.io/ios/app/id1561700741)

**In-app purchases:** none


## Frequently asked questions

### Is ワイヤレスCO2モニター free?

ワイヤレスCO2モニター is free to download, with no in-app purchases.

### Is 差圧チェッカー free?

差圧チェッカー is free to download, with no in-app purchases.

### Do ワイヤレスCO2モニター or 差圧チェッカー have ads?

Neither ワイヤレスCO2モニター nor 差圧チェッカー shows ads.

### Which is updated more often, ワイヤレスCO2モニター or 差圧チェッカー?

ワイヤレスCO2モニター ships an update every 11 months, and 差圧チェッカー every 3 months. Most recently, ワイヤレスCO2モニター was updated on September 10, 2026 and 差圧チェッカー on September 16, 2026.

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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.*