The best home security systems of 2021: Live monitoring, DIY kits, video doorbells and more

By CNET

Best DIY system: SimpliSafe Home Security

Abode

Ring Alarm

Nest Secure

Best professional installation system: Comcast Xfinity Home

Vivint Smart Home

AT&T Digital Life

Best video doorbell: Nest Hello

August View

Ring Video Doorbell 2

Philips Hue Outdoor Sensor

Alexa Guard