249+ iOS apps curated and reviewed
Looking for free carbon monoxide detector apps? 19 of our 249+ tracked titles are free to download — no subscription, no trial. The rest are premium picks worth paying for.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | — | No | No | May 2026 | |
| 2 |  | Free | 5.0★ (1) | No | No | Sep 2026 | |
| 3 |  | Free | 2.7★ (3) | No | No | Sep 2026 | |
| 4 |  | Free | 4.7★ (2.6K) | Yes | Yes | Sep 2026 | |
| 5 |  | Free | 2.0★ (1) | No | No | May 2026 | |
| 6 |  | Free | — | No | No | Jun 2026 | |
| 7 |  | Free | — | No | No | May 2026 | |
| 8 |  | Free was $0.99 | — | No | No | Jul 2026 |
This app works with a smartphone-powered USB device to detect various gas leaks like methane and formaldehyde. It provides real-time monitoring and alerts to enhance safety at home or work. Pinpoint emission sources effortlessly for peace of mind.
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.
