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

Google Nest Protect (Wired). It runs on mains power with battery backup, senses far more than smoke and CO, speaks room-named warnings, self-tests continuously and adds a Pathlight. Kidde Smart Smoke & CO Detector with Ring wins on price and needs no wiring at all.

Yes. Google Nest Protect (Wired) is designed for a 120V alarm circuit and keeps 3 AA batteries as backup, so it never needs routine battery changes. Kidde Smart Smoke & CO Detector with Ring runs entirely on two included AA batteries and mounts anywhere without electrical work.

Google Nest Protect (Wired) interconnects wirelessly with other Nest Protects over an 802.15.4 radio that works even when Wi-Fi is down, but it does not link to existing wired alarms. Kidde Smart Smoke & CO Detector with Ring uses a wire-free interconnect so all Kidde alarms in the home sound together.

Both address it. Google Nest Protect (Wired) uses a humidity sensor and Steam Check algorithms to ignore shower steam, and gives a spoken heads-up before the horn. Kidde Smart Smoke & CO Detector with Ring uses enhanced sensing that Kidde says reduces cooking nuisance alarms compared with its earlier generations.

Google Nest Protect (Wired) works with Google Home and Home Assistant, with no Alexa, HomeKit, SmartThings or Matter. Kidde Smart Smoke & CO Detector with Ring works with the Ring app and Alexa devices, with no Google Home, HomeKit, SmartThings or Matter support.

Renters and anyone without alarm wiring who wants smoke and CO detection with free phone alerts and no midnight chirping, at a much lower price. If you have wiring and want spoken alerts, a night light and constant self-testing, Google Nest Protect (Wired) is the more complete device.