Google Allo is an application for mobile devices.
=== Optional encryption ===Following Allo's introduction at Google I/O, Google was criticized by security experts and privacy advocates for having the end-to-end encryption turned off by default, which they argue leaves the app open to government surveillance
=== Message retention ===When Allo was first introduced, its developers talked about storing non-incognito messages only "transiently and in non-identifiable form"

