Smoke & CO Detectors · Head to head

Kidde Smart Smoke & CO Detector with Ring vs X-Sense Wi-Fi Carbon Monoxide Alarm

Full Smart Smoke & CO Detectors comparison in 2026

Updated November 2026
Data from the official Kidde and X-Sense sites.
2026 verdict
For covering both smoke and carbon monoxide in one unit, the Kidde Smart Smoke & CO Detector with Ring is the better buy of these two.
Kidde Smart Smoke & CO Detector with Ring
Winner
Kidde Smart Smoke & CO Detector with Ring
$69.97
Buy on Amazon USA
It is the only one of the pair that senses smoke as well as CO, and it adds an electrochemical CO sensor with low-level alerts, a wider alert set, steam-check tuning against cooking nuisance alarms, and wireless interconnect so every Kidde alarm sounds together. The X-Sense Wi-Fi Carbon Monoxide Alarm answers with the lower price, the higher owner rating, an LCD that shows the live CO reading, a built-in light and a 5-year warranty. Both connect over 2.4GHz Wi-Fi and alert your phone. Pick the Kidde Smart Smoke & CO Detector with Ring for full hazard coverage, and the X-Sense Wi-Fi Carbon Monoxide Alarm for a dedicated CO monitor with a display.
Works with
Connectivity
  • Wi-Fi 2.4 GHz
vs
Works with
Connectivity
  • Wi-Fi 2.4 GHz
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FeatureKidde Smart Smoke & CO Detector with RingX-Sense Wi-Fi Carbon Monoxide AlarmWinner
Price$69.97£35.99X-Sense Wi-Fi Carbon Monoxide Alarm
Rating4.34.6X-Sense Wi-Fi Carbon Monoxide Alarm
Connectivity2.4 GHz WiFi, Other2.4 GHz WiFiKidde Smart Smoke & CO Detector with Ring
ScreenNOYESX-Sense Wi-Fi Carbon Monoxide Alarm
SensorsSmoke, COCOKidde Smart Smoke & CO Detector with Ring
AlertsFire Alerts, CO Alerts, Low Battery AlertsCO Alerts, Low Battery AlertsKidde Smart Smoke & CO Detector with Ring
Steam CheckYESNOKidde Smart Smoke & CO Detector with Ring
IntegrationsHome AssistantHome AssistantTie
Built-in SirenYESYESTie
PathlightNONOTie

What the differences mean

Hazards covered

The Kidde Smart Smoke & CO Detector with Ring senses both smoke and carbon monoxide. The X-Sense Wi-Fi Carbon Monoxide Alarm senses carbon monoxide only, so it cannot stand in for a smoke alarm.

Display

The X-Sense Wi-Fi Carbon Monoxide Alarm has a large LCD showing the live CO reading from 30 to 999 ppm. The Kidde Smart Smoke & CO Detector with Ring has no screen, sending status to the Ring app instead.

CO alerts

The Kidde Smart Smoke & CO Detector with Ring raises low-level CO mobile alerts before a conventional alarm would sound, and its photoelectric sensing cuts cooking nuisance alarms. The X-Sense Wi-Fi Carbon Monoxide Alarm alerts on CO and low battery.

Interconnect and monitoring

The Kidde Smart Smoke & CO Detector with Ring interconnects wirelessly so all Kidde alarms sound together, and it can join optional Ring professional monitoring. The X-Sense Wi-Fi Carbon Monoxide Alarm is a standalone unit.

Warranty and price

The X-Sense Wi-Fi Carbon Monoxide Alarm carries a 5-year warranty and is the lower priced of the two, while the Kidde Smart Smoke & CO Detector with Ring is the pricier unit with a shorter warranty.

Which one to buy if

What owners say

Owners of both alarms like getting alerts without a hub, and both groups describe simple setup. Kidde Smart Smoke & CO Detector with Ring owners lead with the free real-time alerts and status in the Ring app with no subscription, low-level CO warnings that arrive before a conventional alarm would sound, and the end of midnight chirping since low-battery warnings show in the app. Ring households describe pairing straight into an existing Ring Alarm with professional monitoring, and Nest Protect refugees are a happy group. Their notes are the expense relative to a plain alarm, the missing night light, and rare unexplained false alarms. X-Sense Wi-Fi Carbon Monoxide Alarm owners praise how fast it connects to Wi-Fi and the app, a loud clear siren, and the large LCD showing live CO readings, and they like the freestanding design and replaceable battery; it is a CO-only alarm with no smart home integrations.

Frequently Asked Questions

Which is better overall: Kidde Smart Smoke & CO Detector with Ring or X-Sense Wi-Fi Carbon Monoxide Alarm?

The Kidde Smart Smoke & CO Detector with Ring for most homes, because it covers both smoke and carbon monoxide in one unit, adds low-level CO alerts and interconnect, and fits a Ring Alarm system with free app alerts. The X-Sense Wi-Fi Carbon Monoxide Alarm is the better dedicated CO alarm when smoke is already covered elsewhere.

What is the biggest difference between the Kidde Smart Smoke & CO Detector with Ring and the X-Sense Wi-Fi Carbon Monoxide Alarm?

Hazard coverage. The Kidde Smart Smoke & CO Detector with Ring detects smoke and carbon monoxide, while the X-Sense Wi-Fi Carbon Monoxide Alarm detects carbon monoxide only.

Do the Kidde Smart Smoke & CO Detector with Ring and X-Sense Wi-Fi Carbon Monoxide Alarm need a subscription?

No for basic alerts. The Kidde Smart Smoke & CO Detector with Ring gives free real-time status and alerts in the Ring app, with an optional Ring plan for 24/7 monitoring. The X-Sense Wi-Fi Carbon Monoxide Alarm alerts your phone over Wi-Fi at no cost.

Do these alarms work with Alexa, Google Home or Apple Home?

No. Both send alerts through their own apps rather than voice assistants, and neither appears as a smart home device in Alexa, Google Home or Apple HomeKit.

Who should buy the Kidde Smart Smoke & CO Detector with Ring?

A Ring household or anyone replacing a Nest Protect who wants smoke and CO covered in one battery-powered unit, with free app alerts and low-level CO warnings.

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

Anyone who already has smoke alarms and wants a well-rated, screen-equipped standalone carbon monoxide detector for a home with gas appliances or a wood stove.

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