https://www.cnet.com/news/all-the-new-google-assistant-announcements-from-ifa-2017-alexa-siri-voice-moto-x4/

The competition to control phones, speakers and smart homes with your voice is hotting up. There are a range of personal assistant systems you talk to, backed by some of the biggest brands in technology. Amazon's Alexa, Apple's Siri and Microsoft's Cortana are all in the running -- and then there's Google Assistant, which has the big advantage of coming built-in to Android phones.

Other mobile, audio and smart home manufacturers are currently choosing which horse to back, and at technology trade show IFA in Berlin this week we're seeing a stable of products that support each of these different voice systems. Several brands have already backed Alexa. Some Android devices that include Alexa, like the Moto X4, have access to both systems.