https://www.theverge.com/2017/11/28/16711134/amazon-alexa-echo-voice-recognition-developers-personalize-apps

Amazon toady announced that third-party developers will be able to make use of the Alexa assistant’s voice recognition feature to personalize apps for its line of Echo speakers. The news, announced at Amazon’s re:Invent conference in Las Vegas and reported first by TechCrunch, builds on the company’s announcement in October that Alexa can now identify individual users’ voices to personalize responses.

Until today, that recognition feature only worked for Amazon-built services like shopping lists, flash briefing news updates, and Amazon Music, among other built-in skills. Starting some time in early 2018, however, developers will be able to tap into those voice-based profiles to make apps more personalized to various members of a household. This yet again puts Amazon ahead of rival Google in the smart home and digital assistant fields. Google launched multi-user support using voice recognition back in April, but has yet to announce third-party app integration for the feature.