It's easy for third - party companies to make compatible smart home devices that work with both of them. (cnet.com)
With Google Assistant built — in, you can control compatible smart home devices with your voice and do things like turn up the thermostat, turn lights on and off or check to see if the front door is locked. (verizonwireless.com)
In a statement to TechHive, Amazon said there are more than 12,000 Alexa compatible smart home devices from over 2,000 brands. (techhive.com)