Duo Mobile works on every device - including smartwatches. Use your Apple Watch to receive login requests on your wrist, and authenticate on your iPhone, iPad or Apple Watch. Duo Mobile for iOS also supports Touch ID, an additional layer of security to verify your users’ identities.How does duo app work?
Google Duo is a android app that works as an alternative to Skype or other video chat apps. Usual process of installing app for your device through its app distribution platform, app asking for your phone number, getting the verification code trough SMS and then you are able to use the app.