Bottom LineAt $100, the Nest Protect is one of the most expensive, but also one of the most comprehensive, of the smart smoke detectors we've tested. Not only does it pick up several types of fires, as well as carbon monoxide, but it also does the best job at alerting you of the danger. And, it works with a wide range of smart home products. So, for example, you can set your Philips Hue lights to turn on automatically when the Nest Protect goes off. Our budget pick, the Roost Smart Battery $35, is good for those who want to retrofit existing "dumb" smoke detectors to make them smart. It’s inexpensive, sends an alert to your smartphone, and lets you silence the alarm remotely.

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When our testing concluded, the Nest Cam Indoor earned our highest score as the best security camera overall.

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