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Smart Smoke & CO Detectors
Connected smoke and carbon monoxide alarms ranked on sensing, interconnect, and alert reliability.
A smart alarm earns its premium in the alert you receive away from home, and in what it does not do: nuisance chirps at 3 a.m. and false cooking alarms that teach families to ignore it. The specs that matter are sensor type, photoelectric for smoldering fires and ionization for fast flames, hardwired versus battery power, and whether alarms interconnect so one detection sounds throughout the house.
The ten alarms below are the honest connected field in 2027: Nest Protect at the premium end, First Alert and Kidde smart lines, X-Sense interconnected and Wi-Fi models, and a Z-Wave option for hub homes. Standalone CO-only smart alarms round out the set for homes whose smoke coverage is already handled. All are models sold on Amazon; note that connected smoke and CO remains a thinner category than other smart-home gear, and several picks are interconnect or hub-based rather than direct Wi-Fi.
Every guide on smart smoke & co detectors
12 guides
Best of
The Best Smart Smoke & CO Detectors (2027)
The best smart smoke and CO detectors for 2027, ranked on sensor quality, interconnect behavior, alert paths, and 10-year ownership cost.
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For frequent travelers
The Best Smart Smoke & CO Detectors for Travelers (2027)
The best smart alarms for 2027 for owners who travel: phone alerts, self-tests, and remote silencing that work from anywhere.
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For multi-story homes
Best Smart Smoke & CO Detectors for Multi-Story Homes (2027)
The best interconnected alarms for 2027: every unit sounds for every event, across floors, wired or wireless.
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For renters and apartments
The Best Smart Smoke & CO Detectors for Renters (2027)
The best renter-friendly smart alarms for 2027: battery models that add phone alerts without wiring or landlord projects.
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Review
Google Nest Protect (2nd Gen) Review (2027)
Google Nest Protect (2nd Gen) · The premium split-spectrum alarm that speaks, self-tests, and lights your path.
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Review
First Alert Z-Wave ZCOMBO Review (2027)
First Alert Z-Wave Smoke & CO Alarm ZCOMBO · The hub-home combo alarm: Z-Wave alerts through Ring Alarm or SmartThings, no Wi-Fi needed.
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Review
X-Sense SC07-W Review (2027)
X-Sense SC07-W Wireless Interconnected · Interconnected combo alarms that all sound together, with a 10-year sealed battery.
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Review
First Alert SCO500B Wireless Interconnected Smoke & CO Alarm Review (2027)
First Alert SCO500B Wireless Interconnected Smoke & CO Alarm · A battery combo alarm that wirelessly interconnects up to 16 units, with voice and location alerts.
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Head to head
Nest Protect vs Kidde Smart Smoke & CO (2027)
Head-to-head: Google Nest Protect versus Kidde Smart Smoke and CO on sensing, extras, and whole-home cost.
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Head to head
X-Sense SC07-W vs First Alert ZCOMBO (2027)
Head-to-head: X-Sense SC07-W interconnected set versus First Alert ZCOMBO hub alarm on sounding, alerts, and system design.
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Buying guide
Smart Smoke & CO Detectors Buying Guide (2027)
How to choose smart smoke and CO alarms in 2027: sensor types, placement, interconnect, power, and the alert-path questions brands hope you skip.
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Fix it
Smoke Alarm Chirping or False Alarms? Fixes (2027)
Why smart alarms chirp at night and false-alarm on cooking, and the fixes that restore trust: batteries, placement, dust, and expiry.
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