Monitor CO2, temperature, and humidity levels in real-time using a Bluetooth sensor. Save readings with location data and sync them across Apple devices via iCloud. View historical data on a map.






160+ iOS apps curated and reviewed
From beginner-friendly picks to power-user tools, our carbon monoxide list covers 160+ iPhone apps updated through September 2026. Compare ratings, prices, and screenshots in one place.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 | Free | 2.7★ (3) | No | No | Sep 2026 | ||
| 2 | Free | 4.8★ (44K) | No | No | Sep 2026 | ||
| 3 | Free | 4.0★ (7) | No | No | May 2026 | ||
| 4 | Free | 4.7★ (2.6K) | Yes | Yes | Sep 2026 | ||
| 5 | Free | — | No | No | May 2026 | ||
| 6 | Free | — | No | No | May 2026 | ||
| 7 | Free | 3.4★ (12) | No | No | May 2026 | ||
| 8 | Free | 5.0★ (1) | No | Yes | May 2026 |






Monitor CO2, temperature, and humidity levels in real-time using a Bluetooth sensor. Save readings with location data and sync them across Apple devices via iCloud. View historical data on a map.






Access real-time and forecasted air quality data for over 500,000 locations worldwide. Understand pollutant levels, receive health recommendations, and track wildfire and pollen information to plan your day safely.





This app works with a portable carbon monoxide monitor to provide real-time air quality data and safety alerts. It displays CO levels, tracks exposure over time, and can send emergency text alerts to a designated contact.