226+ iOS apps curated and reviewed
OTG CO Leak Detector is the household name in otg co leak detector, but it's far from the only option. We track 226+ 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 | 5.0★ (1) | Yes | No | May 2026 |
| 3 |  | Free | 4.0★ (1.9K) | No | No | Jul 2026 |
| 4 |  | Free | 4.7★ (6K) | Yes | Yes | Jul 2026 |
| 5 |  | Free | 4.5★ (2.4K) | No | Yes | Jul 2026 |
| 6 |  | Free | 4.6★ (2.7K) | No | Yes | Jul 2026 |
| 7 |  | Free | 4.8★ (2.9K) | No | No | Jul 2026 |
| 8 |  | Free | 4.8★ (22K) | Yes | 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.
This app guides users through migrating their Flo by Moen devices to a new platform before the current app is deactivated. It provides a step-by-step process to ensure a smooth transition for water damage and leak protection devices.
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.
Scan your current network for suspicious devices and identify hidden cameras or bugs using advanced AI and Wi-Fi scanning. Protect your privacy in hotels, public spaces, and more by ensuring your environment is safe.
Protect your privacy by scanning for hidden spy cameras in various locations. This app also functions as a network scanner to detect spy devices, GPS trackers, and more. Stay safe and secure in hotels, bathrooms, and other important places.
This app connects to a smart water leak alarm to monitor your home's plumbing. It detects leaks early to prevent damage and costly repairs, providing real-time alerts and diagnostic information.
Monitor and manage your smart home devices for comfort, safety, and water leak detection. Receive alerts whether you're home or away, and integrate with various smart home partners for comprehensive control.
Control your home remotely with this app. Manage door locks, thermostats, and create custom schedules for energy savings. Grant temporary access codes and automate routines for ultimate convenience.
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.
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.
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.
Monitor and control your indoor air quality in real-time. Gain insights and manage your environment effectively with intelligent features, whether you're at home or away. Experience healthier living through advanced air care.
This AI assistant simplifies smart living by controlling connected devices, automating routines, and providing personalized lifestyle tips. It offers home security monitoring, energy insights, and family organization tools, all within a single, intuitive platform.
Locate, organize, and secure your essential items with this comprehensive tracking app. It provides real-time location monitoring, customizable alerts when items are left behind, and easy organization through custom labels and folders.
Detects and alerts you to unknown Bluetooth trackers like Samsung SmartTags and Tiles that may be following you. Scan your surroundings to find hidden devices and receive notifications if a tracker is detected multiple times in different locations, ensuring your privacy.
Monitor and manage your home's water usage with real-time data and leak detection. This app helps you understand your consumption, set budgets, and receive alerts to prevent costly water damage.
Monitor and improve your indoor air quality with smart devices. Get real-time insights, track trends, and receive actionable advice to enhance focus, reduce allergies, and sleep better. Control your air purifier and stay informed about pollen forecasts.
Control your home's air quality remotely with this app. Adjust temperature, humidity, and freshness, and receive alerts for air quality events. Manage multiple devices and schedules for optimal comfort and energy savings.
Control your air purifier remotely, monitor indoor and outdoor air quality in real-time, and manage filter life. Schedule operation and integrate with voice assistants for hands-free control.