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Smoke & CO Detectors · Head to head

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

Full Smart Smoke & CO Detectors comparison in 2026

Data from Amazon and official Shelly and X-Sense sites.
2026 verdict
Short answer: the X-Sense WiFi Smoke & CO Detector, because it watches for carbon monoxide as well as smoke, which the Shelly alarm cannot do.
X-Sense WiFi Smoke & CO Detector
Winner
X-Sense WiFi Smoke & CO Detector
€33.58€39.9916% OFF
Buy on Amazon GermanyCheck price
Its photoelectric smoke sensor sits next to an electrochemical CO sensor, it shows readings on an LCD, and X-Sense backs it with a 5 year warranty against 3 years for the Shelly Plus Smoke Alarm. The Shelly Plus Smoke Alarm is the smart home choice: it works with Google Home, SmartThings and Home Assistant and runs automations, where the X-Sense reaches only Home Assistant through a community integration and sends its alerts through its own app. Both connect over 2.4 GHz Wi-Fi with no hub, run on a CR123A cell and have a built-in siren and light. Pick the X-Sense WiFi Smoke & CO Detector for a home with a gas boiler, a fireplace or a stove, and the Shelly Plus Smoke Alarm when the alarm has to trigger other devices.
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FeatureShelly Plus Smoke AlarmX-Sense WiFi Smoke & CO DetectorWinner
Price€39.95€33.58X-Sense WiFi Smoke & CO Detector
Rating4.44.5X-Sense WiFi Smoke & CO Detector
Warranty3 years5 yearsX-Sense WiFi Smoke & CO Detector
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 WiFi Smoke & CO Detector
SensorsSmokeSmoke, COX-Sense WiFi Smoke & CO Detector
AlertsFire Alerts, Low Battery AlertsFire Alerts, CO Alerts, Low Battery AlertsX-Sense WiFi Smoke & CO Detector
Built-in SirenYESYESTie
Built-in LightYESYESTie
Tests ItselfNONOTie

What the differences mean

Carbon monoxide

The X-Sense WiFi Smoke & CO Detector detects CO and raises CO alerts; the Shelly Plus Smoke Alarm detects smoke only. In a home with a gas boiler, a fireplace or an attached garage, the X-Sense covers a hazard the Shelly leaves to a second device.

Smart home platforms

The Shelly Plus Smoke Alarm works with Google Home, SmartThings and Home Assistant, so smoke can switch on lights or send a voice announcement. The X-Sense WiFi Smoke & CO Detector works with none of the voice platforms and reaches Home Assistant only through a community integration that reads its cloud account.

Screen

The X-Sense WiFi Smoke & CO Detector has an LCD that shows its readings on the ceiling, useful for checking a CO level at a glance. The Shelly Plus Smoke Alarm has no screen and leaves everything to the app.

Size

At 144 x 144 x 50 mm and 480 g, the X-Sense WiFi Smoke & CO Detector is a big unit. The Shelly Plus Smoke Alarm is 86 x 88 x 31 mm and 95 g, which disappears on a ceiling.

Warranty and battery

X-Sense covers its alarm for 5 years, Shelly for 3. The Shelly Plus Smoke Alarm has a published 5 year battery rating; the X-Sense battery life is not documented, though its sensors are rated for a 10 year lifespan.

Which one to buy if

What owners say

Owners of both alarms praise an easy setup, a loud siren and real-time phone alerts over Wi-Fi with no hub to buy. Shelly Plus Smoke Alarm owners single out how well it plugs into Home Assistant, MQTT and Google Home, and a long battery rating, and they mention a short pairing window and, for a small minority, false alarms after months of use. X-Sense WiFi Smoke & CO Detector owners value covering smoke and carbon monoxide with one mounted unit, a readable LCD and fast warranty replacements when a unit failed, and their caveats are that it plugs into no smart home platform, is bigger than a standard smoke alarm and has a mounting bracket that is awkward to level.

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 WiFi Smoke & CO Detector

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Frequently Asked Questions

Which is better overall: Shelly Plus Smoke Alarm or X-Sense WiFi Smoke & CO Detector?

The X-Sense WiFi Smoke & CO Detector, because it detects carbon monoxide as well as smoke, has an LCD and a 5 year warranty. The Shelly Plus Smoke Alarm is the better pick for a smart home, since it works with Google Home, SmartThings and Home Assistant.

Does the Shelly Plus Smoke Alarm detect carbon monoxide?

No. The Shelly Plus Smoke Alarm has no CO sensor and no CO alerts. The X-Sense WiFi Smoke & CO Detector combines a photoelectric smoke sensor with an electrochemical CO sensor in one unit.

Do the Shelly Plus Smoke Alarm and the X-Sense WiFi Smoke & CO Detector need a hub?

No. Both connect straight to 2.4 GHz Wi-Fi and send alerts to your phone without any hub or gateway.

Does the X-Sense WiFi Smoke & CO Detector work with Alexa or Google Home?

No. The X-Sense WiFi Smoke & CO Detector does not work with Alexa, Google Home, Apple Home, SmartThings or Matter; it reaches Home Assistant through a community integration. The Shelly Plus Smoke Alarm works with Google Home, SmartThings and Home Assistant, but not with Alexa either, which has no device type for smoke alarms outside Matter.

Who should buy the Shelly Plus Smoke Alarm?

Smart home users who want smoke alerts to drive automations in Home Assistant, Google Home or SmartThings, and who already have CO covered by another alarm.

Who should buy the X-Sense WiFi Smoke & CO Detector?

Any home with a fuel-burning appliance that wants smoke and carbon monoxide covered by one Wi-Fi alarm with a screen and a 5 year warranty, and does not need voice assistant integration.

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