Full Smart Smoke & CO Detectors comparison in 2026
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| Feature | Aqara Smart Smoke Detector | Google Nest Protect (Wired) | Winner |
|---|---|---|---|
| Price | €39.99 | $499.99 | Aqara Smart Smoke Detector |
| Rating | 4.4 | 4.6 | Google Nest Protect (Wired) |
| Warranty | 1 year | 2 years | Google Nest Protect (Wired) |
| Connectivity | Zigbee | 2.4 GHz WiFi, Bluetooth, Other | Google Nest Protect (Wired) |
| Integrations | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter | Google Home, Home Assistant | Aqara Smart Smoke Detector |
| Sensors | Smoke | Smoke, CO, Occupancy, Temperature, Humidity, Ambient Light, Motion | Google Nest Protect (Wired) |
| Alerts | Fire Alerts, Low Battery Alerts | Fire Alerts, CO Alerts, Low Battery Alerts | Google Nest Protect (Wired) |
| Tests Itself | NO | YES | Google Nest Protect (Wired) |
| Pathlight | NO | YES | Google Nest Protect (Wired) |
| Steam Check | NO | YES | Google Nest Protect (Wired) |
| Screen | NO | NO | Tie |
| Built-in Siren | YES | YES | Tie |
The Google Nest Protect (Wired) detects smoke and carbon monoxide. The Aqara Smart Smoke Detector is smoke only, so it needs a separate CO alarm where gas appliances are present.
The Google Nest Protect (Wired) needs existing alarm wiring and keeps 3 AA cells as backup. The Aqara Smart Smoke Detector runs on a battery rated for 10 years and mounts anywhere, though many owners find the cell draining sooner.
The Google Nest Protect (Wired) connects over 2.4 GHz Wi-Fi and works through the Nest app with no hub. The Aqara Smart Smoke Detector is Zigbee only and needs a hub for alerts and platforms.
The Aqara Smart Smoke Detector works with Apple HomeKit, Matter, SmartThings and Home Assistant, with Alexa and Google Home through an Aqara hub, and supports automations. The Google Nest Protect (Wired) works with Google Home and Home Assistant only.
The Google Nest Protect (Wired) tests itself, lights a pathlight and uses Steam Check. The Aqara Smart Smoke Detector does none of these.
The Google Nest Protect (Wired) uses that wiring and adds CO detection.
The Aqara Smart Smoke Detector supports HomeKit and Matter; the Nest supports neither.
The Aqara Smart Smoke Detector supports automations through its hub and platforms.
The Google Nest Protect (Wired) covers both hazards.
Both groups single out a loud alarm and an easy setup, so neither stands out there. Aqara Smart Smoke Detector owners talk mostly about integration: pairing with Home Assistant, HomeKit or an Aqara hub and letting a smoke alert switch on lights or set off linked units. Their recurring complaint is a battery that drains far faster than its rating, and a few mention weak Zigbee range. Google Nest Protect (Wired) owners talk about living with it: no low-battery chirps, a voice that names the room before the horn, monthly self-test reports and units that sound together even with Wi-Fi down. Their complaints are the price, interconnection that only works with other Nest Protects and the lack of Alexa and HomeKit.
Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.
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The Google Nest Protect (Wired), for its smoke and CO detection, house power, self-testing, pathlight and Steam Check. The Aqara Smart Smoke Detector is the better choice for an affordable smoke sensor in HomeKit, Matter or Home Assistant.
The Google Nest Protect (Wired) is a hardwired smoke and carbon monoxide alarm that works on its own over Wi-Fi, while the Aqara Smart Smoke Detector is a battery smoke-only sensor that depends on a Zigbee hub.
The Aqara Smart Smoke Detector, which works with Apple HomeKit and Matter through a hub. The Google Nest Protect (Wired) does not support HomeKit, Alexa, SmartThings or Matter.
Yes. The Aqara Smart Smoke Detector is Zigbee only, so it needs a hub such as an Aqara hub, SmartThings or Home Assistant. The Google Nest Protect (Wired) connects over Wi-Fi without one.
Homes with hardwired alarm wiring that want smoke and CO protection, spoken warnings, phone alerts and no battery upkeep, especially Google Home households. The Google Nest Protect (Wired) is the pricier option and only interconnects with other Nest Protects.
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.
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