Shelly Plus Smoke Alarm vs X-Sense Wi-Fi Carbon Monoxide Alarm

The X-Sense Wi-Fi Carbon Monoxide Alarm rates ahead overall on price, owner rating, warranty and its LCD readout. They protect against different hazards, though: the X-Sense senses carbon monoxide, while the Shelly Plus Smoke Alarm detects smoke, so many homes want one of each.

Hazard type. The X-Sense Wi-Fi Carbon Monoxide Alarm is a CO-only detector, while the Shelly Plus Smoke Alarm is a smoke-only alarm. One does not substitute for the other, so full coverage means running both or choosing a combined unit.

The Shelly Plus Smoke Alarm does, connecting over WiFi to Google Home, Alexa, SmartThings and Home Assistant with automations. The X-Sense Wi-Fi Carbon Monoxide Alarm connects only to its own app and has no platform integrations, though it adds an LCD showing live CO readings.

The X-Sense Wi-Fi Carbon Monoxide Alarm is the more affordable unit and carries a 5-year warranty, while the Shelly Plus Smoke Alarm has a 3-year warranty. The X-Sense leads on both cost and warranty length.

Buy the X-Sense Wi-Fi Carbon Monoxide Alarm if your priority is carbon monoxide protection, you want a live LCD reading, a long warranty and a low price, and you already have smoke alarms covering fire.

Buy the Shelly Plus Smoke Alarm if you want automation-friendly WiFi smoke detection that plugs into Google Home, Alexa, SmartThings and Home Assistant, and you will cover carbon monoxide with a separate detector.