250+ iOS apps curated and reviewed
OTG CO Leak Detector is the household name in carbon monoxide detection, but it's far from the only option. We track 250+ alternatives and competitors on iOS — many free, many higher-rated than you'd expect.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | — | No | No | May 2026 | |
| 2 |  | Free | 3.7★ (3) | No | No | Oct 2026 | |
| 3 |  | Free | 3.4★ (7) | No | No | Oct 2026 | |
| 4 |  | Free | 4.6★ (2.6K) | Yes | Yes | Oct 2026 | |
| 5 |  | Free | 2.0★ (1) | No | No | May 2026 | |
| 6 |  | Free | — | No | No | Jun 2026 | |
| 7 |  | Free | 4.0★ (7) | No | No | May 2026 | |
| 8 |  | Free | — | 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.
