Facial RecognitionUnlike most video doorbells, the Nest Hello has facial recognition technology. Once you teach it the names of frequent visitors, the companion app available for both Android and iOS will start to name them in the push notifications. The Nest Hello gets big points for including a snapshot from the camera with each notification, so you can get a glimpse of what's happening without having to open the app. The snapshots are extra handy when facial recognition is wrong — which didn't happen often, to be fair. First, the app asked me to identify my family and close friends multiple times from photos the Hello took. You can do this for anyone who comes to your door. I tagged my husband four times, for example, and my son six times. In the Nest app's Familiar Faces gallery, you can tap Select, choose all the instances of the same person, and tap Merge to combine them. After that, it worked pretty smoothly, but it did misidentify my husband one night as my son's best friend, a 6 year old African American boy who wears glasses. My husband is much taller, a lot older and Caucasian, and does not wear glasses. I also wish the Nest Hello used facial recognition a little better.

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In general, the other products were all very easy to use, though RemoBell had fewer options for motion detection, smart home compatibility and was the only video doorbell we tested that must be rung to show live video.

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Users of this security system do not need to adjust cameras because it’s day and night mode are automatic.

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