Google Nest Protect (Battery) vs Kidde Smart Smoke & CO Detector with Ring

Google Nest Protect (Battery), on sensing depth and features: spoken room-named warnings, Steam Check, Pathlight, daily self-testing and its own interconnect radio, plus Google Home and Home Assistant support. Kidde Smart Smoke & CO Detector with Ring wins on price and is the better received of the two.

Beyond smoke and carbon monoxide, Google Nest Protect (Battery) adds occupancy, temperature, humidity, ambient light and motion sensing. Those feed Steam Check against nuisance alarms, the automatic Pathlight at night and the spoken alert that names the room. Kidde Smart Smoke & CO Detector with Ring senses smoke and CO only.

Both keep sounding locally, but Google Nest Protect (Battery) also interconnects with other Protects over its own 802.15.4 radio, independent of Wi-Fi, so every unit still sounds together. Kidde Smart Smoke & CO Detector with Ring has a wire-free interconnect for Kidde alarms and needs Wi-Fi for app alerts.

Kidde Smart Smoke & CO Detector with Ring sends alerts and low-battery warnings to the Ring app free of charge on two replaceable AA batteries. Google Nest Protect (Battery) sends alerts through the Nest app and self-tests hundreds of times a day, but needs specific Energizer Lithium AA cells rated about two years.

Only Google Nest Protect (Battery), whose Pathlight illuminates automatically when you walk underneath in the dark, driven by its ambient light and motion sensors. Kidde Smart Smoke & CO Detector with Ring has no night light, which is the feature owners most often miss when they switch.

Anyone who wants dual smoke and CO coverage with phone alerts at a much lower price, no wiring and no subscription, especially in a Ring or Alexa household. If you want spoken warnings, a pathlight, Steam Check and continuous self-testing, Google Nest Protect (Battery) is the more advanced alarm.