Winner
Updated September 2026
Data from Amazon and official Kidde and X-Sense sites.
2026 verdict
Across the 2026 comparison, Kidde Smart Smoke + Indoor Air Quality Alarm earns the nod over X-Sense Wi-Fi Carbon Monoxide Alarm on the strength of warranty, integrations, and sensors.
The main reason it wins is warranty, integrations, and sensors, and alerts strengthen that case. There is still a case for X-Sense Wi-Fi Carbon Monoxide Alarm, but mainly if rating and screen are what you value most. Overall, Kidde Smart Smoke + Indoor Air Quality Alarm makes more sense for most people.
Price alerts
Smoke & CO Detector prices change while you decide
We check the price of every Smoke & CO Detector in the catalog daily and email you the drops, whichever one you pick.
| Feature | Kidde Smart Smoke + Indoor Air Quality Alarm | X-Sense Wi-Fi Carbon Monoxide Alarm | Winner |
|---|---|---|---|
| Rating | 3.3 | 4.6 | X-Sense Wi-Fi Carbon Monoxide Alarm |
| Warranty | 10 years | 5 years | Kidde Smart Smoke + Indoor Air Quality Alarm |
| Integrations | Google Home, Alexa, Home Assistant | Home Assistant | Kidde Smart Smoke + Indoor Air Quality Alarm |
| Screen | NO | YES | X-Sense Wi-Fi Carbon Monoxide Alarm |
| Sensors | Smoke, Humidity, Air Quality | CO | Kidde Smart Smoke + Indoor Air Quality Alarm |
| Alerts | Fire Alerts, Low Battery Alerts, Air Quality Alerts | CO Alerts, Low Battery Alerts | Kidde Smart Smoke + Indoor Air Quality Alarm |
| Connectivity | 2.4 GHz WiFi | 2.4 GHz WiFi | Tie |
| Built-in Siren | YES | YES | Tie |
| Built-in Light | YES | YES | Tie |
| Tests Itself | NO | NO | Tie |
| Pathlight | NO | NO | Tie |
| Steam Check | NO | NO | Tie |
Winner
$104.86
- + Warranty: 10 years
- + Integrations: Google Home, Alexa, Home Assistant
- + Sensors: Smoke, Humidity, Air Quality
- - Rating: 3.3 vs 4.6
- - Screen: NO vs YES
Price unavailable right now
- + Rating: 4.6
- + Screen: YES
- - Warranty: 5 years vs 10 years
- - Integrations: Home Assistant vs Google Home, Alexa, Home Assistant
Frequently Asked Questions
Which is better overall: Kidde Smart Smoke + Indoor Air Quality Alarm or X-Sense Wi-Fi Carbon Monoxide Alarm?
Kidde Smart Smoke + Indoor Air Quality Alarm has the stronger overall profile in this comparison, especially for warranty, integrations, and sensors.
What is the biggest difference between Kidde Smart Smoke + Indoor Air Quality Alarm and X-Sense Wi-Fi Carbon Monoxide Alarm?
Rating is one of the clearest differences: Kidde Smart Smoke + Indoor Air Quality Alarm lists 3.3, while X-Sense Wi-Fi Carbon Monoxide Alarm lists 4.6.
Who should buy Kidde Smart Smoke + Indoor Air Quality Alarm?
Choose Kidde Smart Smoke + Indoor Air Quality Alarm if your priority is warranty and integrations and that matters more than rating.
Who should buy X-Sense Wi-Fi Carbon Monoxide Alarm?
Choose X-Sense Wi-Fi Carbon Monoxide Alarm if your priority is rating and screen and that matters more than warranty.
Full comparison table
Compare all 21 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.
- 21 Smoke & CO Detectors
- 44 specs compared
- 41 filters
YoLinkPhotoelectric Smoke Alarm
$49.99
X-SenseWi-Fi CO Alarm
X-SenseSC07-MR Smart Smoke & CO Alarm
HeimanHS1SA Series Smoke Alarm
5% OFF£16.99£16.14
X-SenseWiFi Smoke & CO Detector
X-SenseWi-Fi Smoke Alarm
GoogleNest Protect (Battery)
$400.00
GoogleNest Protect (Wired)
$449.99
ShellySmoke Alarm
25% OFF€53.43€39.95
X-SenseXC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts
AqaraSmart Smoke Detector
16% OFF€44.99€37.99
KiddeSmart Smoke & CO Detector with Ring
$69.97
First AlertSC5 Battery Smart Smoke & CO Alarm
C$169.99
HeimanSmart CO Alarm
20% OFF$59.99$47.99
HeimanMatter Smoke Detector S1-M
$39.99
First AlertSMCO410 Smoke Detector & CO Alarm
$64.98- Kidde
Smart Smoke + Indoor Air Quality Alarm
$104.86 
First AlertSC5 Hardwire Smart Smoke & CO Alarm
C$169.99
KiddeSmart Smoke Alarm (P4010ACS-WF)
$40.79
X-SenseSD19-MN Interconnected Smart Smoke Alarm
33% OFF$32.99$21.99
- Smoke & CO DetectorsKidde
Smart Smoke Alarm (P4010ACS-WF)
3.2(317)$40.79 - Smoke & CO DetectorsKidde
Smart Smoke & CO Detector with Ring
4.3(434)$69.97 - Smoke & CO DetectorsKidde
Smart Smoke + Indoor Air Quality Alarm
3.3(198)$104.86 
Water Leak SensorsKiddeWiFi Water Leak & Freeze Detector
3.9(738)51% OFF$34.97$17.14
Air Quality MonitorsX-SenseXR0A-iR Wi-Fi Radon Detector
4.4(22)20% OFF$99.99$79.99
HubsX-SenseSBS50 Base Station
4.5(108)$29.99
Motion SensorsX-SenseSolar Outdoor Spotlight - Motion-Sensor
4.2(53)9% OFF$64.99$58.89- Smoke & CO DetectorsX-Sense
SC07-MR Smart Smoke & CO Alarm
4.6(692) - Smoke & CO DetectorsX-Sense
SD19-MN Interconnected Smart Smoke Alarm
33% OFF$32.99$21.99 - Smoke & CO DetectorsX-Sense
Wi-Fi CO Alarm
4.6(1,477) - Smoke & CO DetectorsX-Sense
Wi-Fi Smoke Alarm
4.5(392) - Smoke & CO DetectorsX-Sense
WiFi Smoke & CO Detector
4.5(4,336) - Smoke & CO DetectorsX-Sense
XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts
4.4(140) 
Smoke & CO DetectorsX-SenseXP0J-iA Smart Hardwired Smoke & CO Alarm
$48.99
Temperature & Humidity SensorsX-SenseSmart WiFi Indoor Thermometer
4.5(161)23% OFF$14.99$11.59
Temperature & Humidity SensorsX-SenseSTH0B Smart Thermometer Hygrometer
4.5(161)6% OFF$12.34$11.59
Water Leak SensorsX-Sense2-in-1 Wi-Fi Water Leak & Freeze Detector
3.0(102)17% OFF$17.99$14.99
Water Leak SensorsX-SenseWi-Fi Water Leak Detector
4.6(2,229)25% OFF$15.99$11.99