# CO2 Check — Be Aware Of Your Air

> Remote monitoring of carbon dioxide levels from dedicated devices. (iPhone/iPad app by CO2 CHECK LLC.)

- Source: https://appshunter.io/ios/app/co2-check/id1578623635 (this page in markdown: same URL + `.md`)
- Developer: [CO2 CHECK LLC](https://appshunter.io/developer/1578623637)
- Category: Lifestyle, Health & Fitness
- Price: Free
- Rating: 2.80/5 from 15 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.0 · 67 MB
- Languages: English
- Released: 2021-10-21
- Data updated: 2026-08-12
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/co2-check/id1578623635/reviews.md

## What is CO2 Check?

Remotely monitor the carbon dioxide levels on your CO2 Check devices. Get real-time readings and receive push notifications when your levels reach unhealthy levels. Know when ventilation needs to be improved or windows need to be opened. Keep an eye on your CO2 Check device readings from a different room, a different building or even a different city!

## Key features

- Remote CO2 monitoring
- Real-time readings
- Push notifications for unhealthy levels
- Ventilation optimization
- Cross-location monitoring

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/co2-check/id1578623635/reviews.md

### 1/5 — VERY BADDDDD

*2025-03-23*

It doesn’t work, don’t use it, don’t download it, it’s a waste of time

### 1/5 — THE APP DOES NOT WORK!!

*2024-06-25*

This is my first time ever using the app….ever. After downloading, I went to create an account when I got to the password it said the password that I created didn’t work!!! I then tried to change it(although I am new to the app) after erasing password and replacing it with new one it says my email address already has a exiting account. I thought that was strange, so I then go to log in and press “forgot password” and get a notification saying email with instructions have been sent! But I never actually got a email to reset. Sooo then I tried the exact same thing with 3 different email addresses and got the same results 3 different times!! There a glitch or error, somebody needs to fix it!!

## Frequently asked questions about CO2 Check

### What is CO2 Check?

CO2 Check is a free application that allows you to remotely monitor the carbon dioxide levels detected by your CO2 Check devices. It provides real-time readings and sends push notifications when levels become unhealthy.

### How does CO2 Check help improve air quality?

By providing real-time CO2 readings and alerts, CO2 Check helps you understand when ventilation needs to be improved. You'll know when to open windows or adjust your ventilation system to maintain healthier indoor air.

### Can I monitor CO2 levels from anywhere with CO2 Check?

Yes, you can keep an eye on your CO2 Check device readings from a different room, building, or even a different city. The app enables remote monitoring from any location with an internet connection.

### What devices does CO2 Check support?

CO2 Check is available for iPhone and iPod devices. It is designed to work with CO2 Check brand devices for monitoring.

### Is CO2 Check free to use?

Yes, CO2 Check is available for free. There are no in-app purchases or subscription fees associated with using the application.

### Does CO2 Check have ads?

No, CO2 Check does not contain advertisements. The application is ad-free, providing an uninterrupted user experience.

### What is the age rating for CO2 Check?

CO2 Check has an age rating of 4+. This indicates it is suitable for users aged 4 and above.

### When was CO2 Check last updated?

CO2 Check was last updated on October 21, 2021, with version 1.0. The application was initially released on the same date.

## Version history (last 1 release)

### 1.0 — 2021-10-21

No release notes.

## Apps similar to CO2 Check

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [OTG CO Leak Detector](https://appshunter.io/ios/app/otg-co-leak-detector/id6740924509) | — | Free | Lifestyle |
| [Kidde](https://appshunter.io/ios/app/kidde/id942334464) | 4.8 (6,439) | Free | Lifestyle |
| [Onelink Home by First Alert](https://appshunter.io/ios/app/onelink-home-by-first-alert/id1034376317) | 1.5 (295) | Free | Lifestyle |
| [Alen Air](https://appshunter.io/ios/app/alen-air/id1575726185) | 2.6 (175) | Free | Lifestyle |
| [Dwellin: Home Rewards & Care](https://appshunter.io/ios/app/dwellin-home-rewards-and-care/id1566306121) | 4.4 (170) | Free | Lifestyle |
| [CO2 Monitor 2](https://appshunter.io/ios/app/co2-monitor-2/id6711338246) | — | Free | Lifestyle |

## Related topics

[co2 check](https://appshunter.io/ios/topics/co2-check) · [free carbon monoxide detector](https://appshunter.io/ios/topics/free-carbon-monoxide-detector) · [co2 sensor](https://appshunter.io/ios/topics/co2-sensor) · [carbon monoxide](https://appshunter.io/ios/topics/carbon-monoxide) · [carbon monoxide detection](https://appshunter.io/ios/topics/carbon-monoxide-detection) · [carbon monoxide detector](https://appshunter.io/ios/topics/carbon-monoxide-detector) · [co2 detector](https://appshunter.io/ios/topics/co2-detector) · [kidde carbon monoxide](https://appshunter.io/ios/topics/kidde-carbon-monoxide) · [acdac](https://appshunter.io/ios/topics/acdac) · [co2](https://appshunter.io/ios/topics/co2) · [aranet home](https://appshunter.io/ios/topics/aranet-home) · [denver co2 risk calculator](https://appshunter.io/ios/topics/denver-co2-risk-calculator) · [carbon incubator srl](https://appshunter.io/ios/topics/carbon-incubator-srl) · [co2 monitor 2](https://appshunter.io/ios/topics/co2-monitor-2) · [hibou air](https://appshunter.io/ios/topics/hibou-air)

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-12.*