Google Allo

Google Allo was an instant messaging mobile app by Google for the Android and iOS mobile operating systems, with a web client available in some web browsers. It closed on March 12, 2019. The app used phone numbers as identifiers, allowing users to exchange messages, files, voice notes, and images. It included a virtual assistant that generated automatic reply suggestions and an optional encrypted mode known as incognito mode. Users could also resize messages and add doodles and stickers on images before sending them. Before launch, Google touted strong privacy in the app, with particular emphasis on messages stored "transiently and in non-identifiable form". However, at launch, privacy was significantly rolled back, with Google keeping logs of messages indefinitely (or until the user deletes messages) in an effort to improve the app's "smart reply" feature.