A screenshot of Allo's predictive replies.

The messenger has a wide variety of stickers you can exchange with others, and the Whisper Shout function lets users decide how big or small they'd like to send their message to give the impression of volume NO MORE ALL CAPS WHEN YOU'RE SHOUTING!!!!!

OpenTable, for instance, is working with Allo to help users make reservations at a restaurant if they're talking about going there later that evening.

The app was built by the WebRTC team using a new protocol called Quic.

Duo is supposed to work in low-bandwidth situations to minimize video lag frustration.

The app proactively monitors the connection and degrades performance, Google said, adding that it can switch from Wi-Fi to cellular as needed.

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