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Smoke & CO Detectors · Head to head

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

Full Smart Smoke & CO Detectors comparison in 2026

Updated October 2026
Data from Amazon and official Shelly and X-Sense sites.
2026 verdict
For a smart home that lives on automations, the Shelly Plus Smoke Alarm is the better fit of these two, and it edges the X-Sense Wi-Fi Carbon Monoxide Alarm on battery life and platform reach.
Shelly Plus Smoke Alarm
Winner
Shelly Plus Smoke Alarm
€39.95€53.4325% OFF
Buy on Amazon GermanyCheck price
It is a smoke-only detector rated for five years on its CR123A battery, it pairs over 2.4 GHz Wi-Fi and Bluetooth without a hub, and it works with Google Home, Samsung SmartThings and Home Assistant and can trigger other devices through automations. The X-Sense Wi-Fi Carbon Monoxide Alarm guards a different hazard: it is a CO-only alarm with no smoke sensor or fire alerts, and it answers with a five-year warranty, a built-in light and a large LCD showing live CO levels, though it connects only to its own app. Neither supports Alexa, Apple HomeKit or Matter. Choose the Shelly Plus Smoke Alarm for automation-friendly smoke detection, and the X-Sense Wi-Fi Carbon Monoxide Alarm for a dedicated CO monitor with a live readout.
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FeatureShelly Plus Smoke AlarmX-Sense Wi-Fi Carbon Monoxide AlarmWinner
Price€39.95€39.87X-Sense Wi-Fi Carbon Monoxide Alarm
Rating4.44.6X-Sense Wi-Fi Carbon Monoxide Alarm
Warranty3 years5 yearsX-Sense Wi-Fi Carbon Monoxide Alarm
Battery Life5 years1 yearShelly Plus Smoke Alarm
Connectivity2.4 GHz WiFi, Bluetooth2.4 GHz WiFiShelly Plus Smoke Alarm
IntegrationsGoogle Home, Samsung SmartThings, Home AssistantHome AssistantShelly Plus Smoke Alarm
ScreenNOYESX-Sense Wi-Fi Carbon Monoxide Alarm
SensorsSmokeCOTie
AlertsFire Alerts, Low Battery AlertsCO Alerts, Low Battery AlertsTie
Built-in SirenYESYESTie
Built-in LightYESYESTie
Tests ItselfNONOTie

What the differences mean

Hazard covered

The Shelly Plus Smoke Alarm senses smoke and raises fire alerts. The X-Sense Wi-Fi Carbon Monoxide Alarm senses carbon monoxide and raises CO alerts. Neither covers the other hazard, so many homes would run both or pick a combined unit.

Battery life

The Shelly Plus Smoke Alarm is rated for five years on its CR123A battery, while the X-Sense Wi-Fi Carbon Monoxide Alarm runs about a year. The Shelly is the one you can mount and mostly forget.

Smart home reach

The Shelly Plus Smoke Alarm works with Google Home, Samsung SmartThings and Home Assistant and supports automations, so it can turn on lights or send a notification when smoke is detected. The X-Sense Wi-Fi Carbon Monoxide Alarm connects only to its own app, with Home Assistant the one platform listed.

Screen

The X-Sense Wi-Fi Carbon Monoxide Alarm has an LCD that shows the live CO level rather than a simple pass or fail. The Shelly Plus Smoke Alarm has no screen at all.

Warranty

The X-Sense Wi-Fi Carbon Monoxide Alarm carries a five-year warranty against three years for the Shelly Plus Smoke Alarm, a longer cover on the device that needs its battery changed sooner.

Which one to buy if

What owners say

Owners of both devices like a setup that takes minutes over 2.4 GHz Wi-Fi, and both groups value phone alerts while they are away. Shelly Plus Smoke Alarm owners praise the hub-free pairing and the way it slots into Home Assistant, MQTT and SmartThings for notifications and scene triggers, along with the loud siren, the built-in light and the long battery life; their warnings are a short initial pairing window, no CO sensor, no Apple Home support and a few reports of false alarms over time. X-Sense Wi-Fi Carbon Monoxide Alarm owners focus on its single job, calling the freestanding design convenient, the siren loud and the LCD clear, and several praise warranty support; a few note the app is not localized everywhere and that notifications can lag the device.

Price history compared

Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.

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

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Frequently Asked Questions

Which is better overall: Shelly Plus Smoke Alarm or X-Sense Wi-Fi Carbon Monoxide Alarm?

The Shelly Plus Smoke Alarm, if you want a smart alarm. It lasts five years on a battery and integrates with Google Home, SmartThings and Home Assistant with automations. The X-Sense Wi-Fi Carbon Monoxide Alarm is the better CO detector, with a live LCD readout, a built-in light and a longer warranty.

What is the biggest difference between the Shelly Plus Smoke Alarm and the X-Sense Wi-Fi Carbon Monoxide Alarm?

The hazard each one detects. The Shelly Plus Smoke Alarm is smoke-only, and the X-Sense Wi-Fi Carbon Monoxide Alarm is CO-only with no smoke sensor or fire alerts. One does not substitute for the other.

Which one integrates with smart home platforms?

The Shelly Plus Smoke Alarm works with Google Home, Samsung SmartThings and Home Assistant and supports automations. The X-Sense Wi-Fi Carbon Monoxide Alarm connects only to its own app, with Home Assistant as the one listed platform.

How do battery life and warranty compare?

The Shelly Plus Smoke Alarm is rated for five years on a CR123A battery with a three-year warranty, while the X-Sense Wi-Fi Carbon Monoxide Alarm runs about a year and carries a five-year warranty.

Who should buy the Shelly Plus Smoke Alarm?

Buyers who want smoke detection wired into Home Assistant, MQTT or SmartThings, and who value a long battery life and hub-free setup.

Who should buy the X-Sense Wi-Fi Carbon Monoxide Alarm?

Buyers who need a dedicated carbon monoxide monitor with a live LCD readout, a built-in light and a long warranty, and who will cover smoke separately.

Full comparison table

Compare all 25 Smoke & CO Detectors side by side

You are looking at two of them. The full table lines up all Smoke & CO Detectors in the catalog with the same specs, so you can filter by what you need and sort by price or rating.

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