249+ iOS apps curated and reviewed
Looking for free 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 | May 2026 | |
| 4 |  | Free | 4.8★ (44K) | No | No | Sep 2026 | |
| 5 |  | Free | 4.8★ (25K) | No | No | Sep 2026 | |
| 6 |  | Free | 4.0★ (7) | No | No | May 2026 | |
| 7 |  | Free | — | Yes | No | May 2026 | |
| 8 |  | Free | 3.0★ (2) | No | No | May 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.
