Allo, on the other hand, is a mobile app more akin to WhatsApp, Facebook Messenger and Line. You don't even need a Gmail account to sign up -- just a phone number. Google introduced Allo, along with its video calling companion Duo, at its annual I/O developer conference earlier today. The company describes it as a smart messaging app imbued with the powers of artificial intelligence. It can conjure up automatic replies, make reservations for you in-app and even has an Incognito mode for encrypted messaging. Allo and Duo will arrive sometime this summer for both iOS and Android users, so for now, you'll have to make do with simpler chat apps.

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