Allo is an instant messaging mobile app developed by Google that includes a virtual assistant and provides a “smart reply” function that allows users to reply without typing.

Allo’s “Smart reply” function uses Google’s machine learning technology to suggest a reply to the last message, which can be selected from a few options. The feature also analyses images sent to the user in order to suggest responses. Similar to the smart reply feature seen in Google’s Inbox app, it learns from the user’s behaviour to adapt its suggestions over time.[7] Allo is one of the apps that support Google Assistant, a conversational virtual assistant.

“Whisper Shout” allows the user to increase or decrease the size of a message to represent volume.

Allo also lets users draw on photos before sending them.