Winner
Updated November 2026
Data from the official Kidde and X-Sense sites.
2026 verdict
Smoke and carbon monoxide against smoke alone: the Kidde Smart Smoke & CO Detector with Ring covers both hazards, so it is the smart smoke alarm to pick of these two.
It adds a steam check against kitchen and shower nuisance alarms, reports into the Ring app and runs on two AA batteries. The X-Sense Wi-Fi Smoke Alarm detects smoke only, but it carries a 10 year battery, a 5 year warranty, a built-in light and a compact 92 g body, and it needs no hub. Both use 2.4 GHz Wi-Fi and list Home Assistant, and neither works with Alexa, Google Home or Apple Home. Choose the Kidde Smart Smoke & CO Detector with Ring for a Ring household or a Nest Protect replacement, and the X-Sense Wi-Fi Smoke Alarm to add cheap phone alerts to a room where CO is already covered.
Works with
Connectivity
- Wi-Fi 2.4 GHz
vs
Works with
Connectivity
- Wi-Fi 2.4 GHz
News by email
Still comparing? Get what's new by email
New releases and the smart home news worth knowing, in your inbox.
No spam. Unsubscribe in one click.
| Feature | Kidde Smart Smoke & CO Detector with Ring | X-Sense Wi-Fi Smoke Alarm | Winner |
|---|---|---|---|
| Connectivity | 2.4 GHz WiFi, Other | 2.4 GHz WiFi | Kidde Smart Smoke & CO Detector with Ring |
| Sensors | Smoke, CO | Smoke | Kidde Smart Smoke & CO Detector with Ring |
| Alerts | Fire Alerts, CO Alerts, Low Battery Alerts | Fire Alerts, Low Battery Alerts | Kidde Smart Smoke & CO Detector with Ring |
| Steam Check | YES | NO | Kidde Smart Smoke & CO Detector with Ring |
| Rating | 4.3 | 4.3 | Tie |
| Integrations | Home Assistant | Home Assistant | Tie |
| Screen | NO | NO | Tie |
| Built-in Siren | YES | YES | Tie |
| Pathlight | NO | NO | Tie |
What the differences mean
Carbon monoxide
The Kidde detects smoke and carbon monoxide and sends CO alerts. The X-Sense Wi-Fi Smoke Alarm is smoke only, so a home relying on it also needs a separate CO alarm.
Steam check
Only the Kidde lists a steam check, meant to cut nuisance alarms from cooking and showers. The X-Sense does not list one, which matters for a hallway near the kitchen or bathroom.
Battery
The X-Sense uses a CR123A rated for 10 years and comes with a 5 year warranty. The Kidde runs on two AA batteries and lists no warranty or battery life, so plan to swap cells at some point.
Ecosystem
The Kidde is built around the Ring app and Ring Alarm, with wireless interconnect to other Kidde alarms. The X-Sense is a standalone Wi-Fi alarm. Both list Home Assistant and neither lists Alexa, Google Home, Apple Home or Matter.
Light and size
The X-Sense has a built-in light and a compact 78 x 78 x 48 mm body at 92 g. The Kidde is larger at 127 x 127 x 51 mm and lists no built-in light or pathlight.
Which one to buy if
- you want one alarm that covers both smoke and carbon monoxide
The Kidde Smart Smoke & CO Detector with Ring has both sensors, while the X-Sense Wi-Fi Smoke Alarm is smoke only.
- you already use Ring Alarm or the Ring app
It reports straight into Ring, with alerts and status in the app you already have.
- you only need smoke coverage and want the longest battery and warranty
The X-Sense Wi-Fi Smoke Alarm has a 10 year battery rating and a 5 year warranty.
- you are replacing a Nest Protect and cook near the alarm
The Kidde covers CO like the Protect did and has a steam check, though it has no night light.
Winner
$69.97
- + Connectivity: 2.4 GHz WiFi, Other
- + Sensors: Smoke, CO
- + Alerts: Fire Alerts, CO Alerts, Low Battery Alerts
- - Connectivity: 2.4 GHz WiFi vs 2.4 GHz WiFi, Other
- - Sensors: Smoke vs Smoke, CO
What owners say
Owners of both alarms praise fast setup and phone alerts that arrive while they are away, and both groups value not having to climb a ladder to deal with a low-battery chirp. Kidde Smart Smoke & CO Detector with Ring owners single out the Ring integration with free status and alerts, wireless interconnect, a very loud alarm and relief at the end of 3am chirping, and many arrive as Nest Protect refugees. They mention the missing night light, the price and, in one case, a second unexplained false alarm. X-Sense Wi-Fi Smoke Alarm owners like the solid build, the loud siren and light and the replaceable battery. Their warnings are that it has no CO detection and no automatic self-test, that it fits no smart home platform and that the app is only in English for some buyers.
Frequently Asked Questions
Which is better overall: Kidde Smart Smoke & CO Detector with Ring or X-Sense Wi-Fi Smoke Alarm?
The Kidde Smart Smoke & CO Detector with Ring, because it detects carbon monoxide as well as smoke and has a steam check. The X-Sense Wi-Fi Smoke Alarm is the better pick for a smoke-only alarm with a 10 year battery.
What is the biggest difference between the Kidde Smart Smoke & CO Detector with Ring and the X-Sense Wi-Fi Smoke Alarm?
Carbon monoxide. The Kidde Smart Smoke & CO Detector with Ring senses both smoke and CO, while the X-Sense Wi-Fi Smoke Alarm senses smoke only and sends no CO alerts.
Does the X-Sense Wi-Fi Smoke Alarm detect carbon monoxide like the Kidde Smart Smoke & CO Detector with Ring?
No. The X-Sense Wi-Fi Smoke Alarm has no carbon monoxide sensor, so you would need a separate CO detector. The Kidde Smart Smoke & CO Detector with Ring covers both.
Is the Kidde Smart Smoke & CO Detector with Ring a good replacement for a Nest Protect?
It is the alarm many Nest Protect owners move to: it covers smoke and CO, runs on batteries, alerts through Ring and interconnects wirelessly. What it lacks is the night light, and the X-Sense Wi-Fi Smoke Alarm lacks CO entirely.
Which uses Wi-Fi and which needs a hub, the Kidde Smart Smoke & CO Detector with Ring or the X-Sense Wi-Fi Smoke Alarm?
Both use 2.4 GHz Wi-Fi. The X-Sense Wi-Fi Smoke Alarm needs no hub, and the Kidde Smart Smoke & CO Detector with Ring reports to the Ring app.
Who should buy the X-Sense Wi-Fi Smoke Alarm?
Buyers who want simple phone alerts from a smoke alarm with a 10 year battery, a built-in light and a 5 year warranty, and who already have CO covered.
Spotted something wrong on this page? Tell us and we will fix it.
Our store on AmazonShop our ideas on AmazonLists of the smart home setups we would put together ourselves, ready to add to your Amazon cart.Shop on AmazonFull comparison table
Compare all 28 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.
- 28 Smoke & CO Detectors
- 45 specs compared
- 42 filters
- Smoke & CO Detectors
Photoelectric Smoke Alarm
5.0(15)$49.99 - Smoke & CO Detectors
WiFi Smoke & CO Detector
4.7(727)£44.21 - Smoke & CO Detectors
Nest Protect (Wired)
4.6(4.6K) - Smoke & CO Detectors
Wi-Fi CO Alarm
4.6(1.5K)£35.99 - Smoke & CO Detectors
SC07-MR Smart Smoke & CO Alarm
4.6(726) - Smoke & CO Detectors
HS1SA-E Zigbee Smoke Alarm
4.6(131)£32.99 - Smoke & CO Detectors
15% OFFSD19-MN Interconnected Smart Smoke Alarm
4.5(22)£22.09£25.99 - Smoke & CO Detectors
Nest Protect (Battery)
4.4(7.5K) - Smoke & CO Detectors
Smart Smoke Detector
4.4(607) - Smoke & CO Detectors
7% OFF
Smoke Alarm
4.4(560)£64.81£69.74 - Smoke & CO Detectors
20% OFFXC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts
4.4(161)£26.32£32.99 - Smoke & CO Detectors
Carbon Monoxide Detector C1-S
4.4(151)$29.99 - Smoke & CO Detectors
10% OFFSmoke and CO Alarm HM-636THS
4.4(136)$35.98$39.99 - Smoke & CO Detectors
10% OFF
Matter Smoke Detector S1-TM
4.4(23)$44.98$49.98 - Smoke & CO Detectors
5% OFF
Smoke Alarm E10
4.3(79)£75.99£79.99 - Smoke & CO Detectors
17% OFFSmoke Alarm HM-636PHS
4.2(85)$24.99$29.99 - Smoke & CO Detectors
Interconnected Smoke Alarm S1-R
4.2(44) - Smoke & CO Detectors
Interconnected CO Alarm C1-R
4.2(27)$31.97 - Smoke & CO Detectors
SMCO410 Smoke Detector & CO Alarm
3.6(279)$64.98 - Smoke & CO Detectors
SC5 Battery Smart Smoke & CO Alarm
3.6(87)
- Air Quality Monitors
XR0A-iR Wi-Fi Radon Detector
4.3(51)$99.99 - Hubs
SBS50 Base Station
4.4(112) - Motion Sensors
Solar Outdoor Spotlight - Motion-Sensor
4.2(53) - Smoke & CO Detectors
SC07-MR Smart Smoke & CO Alarm
4.6(726) - Smoke & CO Detectors15% OFF
SD19-MN Interconnected Smart Smoke Alarm
4.5(22)£22.09£25.99 - Smoke & CO Detectors
Wi-Fi CO Alarm
4.6(1.5K)£35.99 - Smoke & CO Detectors
WiFi Smoke & CO Detector
4.7(727)£44.21 - Smoke & CO Detectors20% OFF
XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts
4.4(161)£26.32£32.99 - Smoke & CO Detectors
XP0J-iA Smart Hardwired Smoke & CO Alarm
$48.99 - Temperature & Humidity Sensors
23% OFFSmart WiFi Indoor Thermometer
4.5(167)$11.49$14.99 - Temperature & Humidity Sensors
23% OFFSTH0B Smart Thermometer Hygrometer
4.5(167)$11.49$14.99 - Water Leak Sensors
2-in-1 Wi-Fi Water Leak & Freeze Detector
3.0(106) - Water Leak Sensors
29% OFFWi-Fi Water Leak Detector
4.5(2.3K)$11.39$15.99