Google Allo was an instant messaging mobile app for Android, iOS, and Web with special features like a virtual assistant and encrypted mode. Launched September 21, 2016; shut down March 13, 2019 — it lived 2 years. One of 37 Google products killed in 2019. 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. Wiki link Data: Killed by Google (killedbygoogle.com, MIT).