Shelly Plus Smoke Alarm vs X-Sense WiFi Smoke & CO Detector

The X-Sense WiFi Smoke & CO Detector is better overall because it senses both smoke and carbon monoxide, carries a higher owner rating and a longer warranty, and adds an LCD screen. The Shelly Plus Smoke Alarm is smoke-only but wins on smart home integration.

Hazard coverage. The X-Sense WiFi Smoke & CO Detector combines smoke and CO sensing with both fire and CO alerts, while the Shelly Plus Smoke Alarm detects smoke only and would need a separate carbon monoxide detector.

The Shelly Plus Smoke Alarm does, connecting over WiFi to Google Home, Alexa, SmartThings and Home Assistant with automations. The X-Sense WiFi Smoke & CO Detector connects only to its own app, trading platform links for dual-hazard coverage and an LCD display.

The X-Sense WiFi Smoke & CO Detector 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 WiFi Smoke & CO Detector if you want one well-rated alarm covering both smoke and carbon monoxide, with a clear LCD readout, a long warranty and WiFi phone alerts, rather than mounting two devices.

Buy the Shelly Plus Smoke Alarm if automation-friendly smoke detection matters most and you want tight ties to Google Home, Alexa, SmartThings and Home Assistant, adding a separate CO detector for carbon monoxide.