Google Nest Protect (Battery) vs X-Sense Wi-Fi Carbon Monoxide Alarm

The Google Nest Protect (Battery) is better overall because it detects both smoke and carbon monoxide, adds extra sensors, self-tests, and works with Google Home and Home Assistant. The X-Sense Wi-Fi Carbon Monoxide Alarm is CO-only, but it is the more affordable pick, carries a longer 5-year warranty, and shows live CO levels on an LCD screen.

The biggest difference is what each detects. The Google Nest Protect (Battery) senses both smoke and carbon monoxide as a full smart alarm, while the X-Sense Wi-Fi Carbon Monoxide Alarm detects carbon monoxide only, with no smoke sensor and no fire alerts, so it is meant to complement a smoke alarm rather than replace one.

The X-Sense Wi-Fi Carbon Monoxide Alarm has an LCD screen that displays the live CO reading from 30 to 999 ppm, while the Google Nest Protect (Battery) has no display and instead relies on spoken warnings, phone alerts and its status light.

The X-Sense Wi-Fi Carbon Monoxide Alarm carries a longer 5-year warranty and has a freestanding design that can sit on a shelf without wall mounting, while the Google Nest Protect (Battery) has a 2-year warranty and is designed to be mounted on a wall or ceiling.

Buy the Google Nest Protect (Battery) if you want a single smart alarm covering both smoke and carbon monoxide with spoken early warnings, phone alerts, self-testing and a pathlight, and you want it to work with Google Home or Home Assistant.

Buy the X-Sense Wi-Fi Carbon Monoxide Alarm if you specifically need standalone carbon monoxide coverage with a live LCD readout and a long warranty, you already have a smoke alarm in place, and you want an affordable, freestanding unit.