https://www.cnet.com/news/googles-inbox-by-gmail-app-will-apparently-shut-down-april-2/

"This app will be going away in 15 days," the alert reads. "You can find your favorite inbox features in the Gmail app. Your messages are already waiting for you."

Google often used the Inbox app to test features before adding them to the main Gmail app. However, last year's Gmail overhaul saw it gain many of Inbox's features.