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) | Yes | No | Aug 2026 |
| 3 |  | Free | 2.7★ (3) | No | No | May 2026 |
| 4 |  | Free | 4.6★ (2.5K) | Yes | Yes | Aug 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.
Check real-time air quality and pollution levels for your current location or any city worldwide. Understand the concentration of various pollutants and receive alerts for unhealthy conditions. Find protection equipment and manage respiratory health.
Measure ambient CO2 levels using a compatible device. This utility app provides environmental data for your surroundings.
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.
This app connects to smart home safety devices, providing real-time alerts for smoke, CO, air quality, and water leaks. It offers features like Smart Hush, remote notifications to loved ones, and advanced indoor air quality monitoring through a subscription service.
Control your smart home devices, including thermostats, cameras, and sensors. Automate your home for comfort and peace of mind, and monitor entryways and cabinets with intelligent alerts. Save energy with custom schedules and find potential rebates.
Transform your iPhone into a precise wall scanner. Easily locate studs, pipes, wires, and other hidden metal objects for DIY projects and home improvements. Offers multiple detection modes and adjustable sensitivity for accurate results.
This utility app connects to a specific radon detection device via Bluetooth. It allows users to monitor radon levels in real-time, set up timed measurements, and configure device settings for expanded functionality.
Transform your phone into a versatile detection tool. Identify metals, coins, stones, and measure electromagnetic fields using your device's sensors and AI. Explore your surroundings and discover hidden objects with real-time scanning and smart recognition.
