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Smoke & CO Detectors · Head to head

Google Nest Protect (Wired) vs X-Sense WiFi Smoke & CO Detector

Full Smart Smoke & CO Detectors comparison in 2026

Updated October 2026
Data from Amazon and official Google and X-Sense sites.
2026 verdict
Mains power or a battery? Among these two smoke and CO alarms, the Google Nest Protect (Wired) is the smarter choice, with house power, self-testing and Google Home support.
Google Nest Protect (Wired)
Winner
Google Nest Protect (Wired)
$499.99
Buy on Amazon USACheck price
Both detect smoke and carbon monoxide and alert your phone over Wi-Fi, but the Nest adds a spoken early warning, occupancy, motion, temperature and humidity sensing, a pathlight, Steam Check against false alarms and wireless interconnection between units, and it works with Google Home as well as Home Assistant. The X-Sense WiFi Smoke & CO Detector answers with an LCD that shows readings, a 5-year warranty against 2 years, and a battery-powered design that goes up anywhere without wiring. It lists Home Assistant as its only integration and does not test itself. Pick the Google Nest Protect (Wired) if you have alarm wiring and use Google Home, and the X-Sense WiFi Smoke & CO Detector for dual-hazard coverage without wiring or a premium price.
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FeatureGoogle Nest Protect (Wired)X-Sense WiFi Smoke & CO DetectorWinner
Price$499.99€33.58X-Sense WiFi Smoke & CO Detector
Rating4.64.5Google Nest Protect (Wired)
Warranty2 years5 yearsX-Sense WiFi Smoke & CO Detector
Connectivity2.4 GHz WiFi, Bluetooth, Other2.4 GHz WiFiGoogle Nest Protect (Wired)
IntegrationsGoogle Home, Home AssistantHome AssistantGoogle Nest Protect (Wired)
ScreenNOYESX-Sense WiFi Smoke & CO Detector
SensorsSmoke, CO, Occupancy, Temperature, Humidity, Ambient Light, MotionSmoke, COGoogle Nest Protect (Wired)
Tests ItselfYESNOGoogle Nest Protect (Wired)
PathlightYESNOGoogle Nest Protect (Wired)
Steam CheckYESNOGoogle Nest Protect (Wired)
AlertsFire Alerts, CO Alerts, Low Battery AlertsFire Alerts, CO Alerts, Low Battery AlertsTie
Built-in SirenYESYESTie

What the differences mean

Power

The Google Nest Protect (Wired) runs on your home's alarm wiring with 3 AA batteries as backup, so batteries are only for outages. The X-Sense WiFi Smoke & CO Detector runs on a CR123A and needs no wiring, which suits homes without alarm circuits.

Google Home

The Google Nest Protect (Wired) works with Google Home and Home Assistant. The X-Sense WiFi Smoke & CO Detector lists Home Assistant only, with no Google Home, Alexa or HomeKit.

Self-testing and false alarms

The Google Nest Protect (Wired) tests itself and uses Steam Check to ignore shower and cooking steam. The X-Sense WiFi Smoke & CO Detector has neither, so you test it by hand.

Extra sensing and pathlight

The Google Nest Protect (Wired) also senses occupancy, motion, temperature, humidity and light, which powers its pathlight at night. The X-Sense WiFi Smoke & CO Detector senses smoke and CO only.

Screen and warranty

The X-Sense WiFi Smoke & CO Detector has an LCD for its readings and a 5-year warranty. The Google Nest Protect (Wired) has no screen and a 2-year warranty.

Which one to buy if

What owners say

Both groups bought for the same reason, one device that watches for smoke and carbon monoxide and pings the phone, and both describe a straightforward install. Google Nest Protect (Wired) owners single out never hearing a low-battery chirp, the voice that names the room before the loud alarm, monthly self-test reports and units that sound together even without Wi-Fi. They complain that it only links with other Nest Protects, costs a lot and lacks Alexa and HomeKit. X-Sense WiFi Smoke & CO Detector owners often mount it near pellet stoves and fireplaces and praise the readable LCD, app alerts across several rooms and quick warranty replacements. Their complaints are that it is bigger than a standard alarm and that the bracket is awkward to line up 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.

  • Google Nest Protect (Wired)
  • X-Sense WiFi Smoke & CO Detector

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Frequently Asked Questions

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

No. The X-Sense WiFi Smoke & CO Detector has no Google Home integration; it sends alerts through the X-Sense app and lists Home Assistant as its only platform. The Google Nest Protect (Wired) works with Google Home and Home Assistant.

Which is better: Google Nest Protect (Wired) or X-Sense WiFi Smoke & CO Detector?

The Google Nest Protect (Wired), for its house power, self-testing, Steam Check, pathlight and Google Home support. The X-Sense WiFi Smoke & CO Detector is the better buy when you have no alarm wiring or want an LCD and a 5-year warranty.

Do both detect smoke and carbon monoxide?

Yes. The Google Nest Protect (Wired) and the X-Sense WiFi Smoke & CO Detector both detect smoke and carbon monoxide and send fire and CO alerts to your phone.

Does either alarm test itself?

Only the Google Nest Protect (Wired), which runs its own tests. The X-Sense WiFi Smoke & CO Detector has no automatic self-test, so owners test it manually.

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

Homes that want smoke and CO covered by one unit without wiring, near fireplaces, stoves or boilers. The X-Sense WiFi Smoke & CO Detector alerts your phone over Wi-Fi and has a 5-year warranty, but no Google Home or Alexa support.

Full comparison table

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