Inbox had been set for the chop for some time, with a Spring 2019 date named by Google last year, but users are now starting to be alerted to the end of their apps.
Some users reported yesterday seeing a pop-up screen that appears when they open the app, saying that the service will close in 15 days time - meaning Inbox could end on April 2nd.
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The pop-up includes a link for the user to switch to the regular Gmail app, where they are assured their messages will be there waiting for them. Google also says it is "working hard" to continue porting over some of Inbox's most-loved features.
First announced in 2014 as an invitation-only service, Inbox offered a more interactive and intelligent way to access your emails away from the vanilla Gmail app.
Praised for its Bundles feature, which brought emails of the same topic together, Inbox also inspired popular features such as automatically sifting through your messages, email snoozing and smart replies, and also featured the all-white design now seen on the main Gmail app.
Inbox is not the only Google service to face the final curtain soon, with the technology giant revealing its troubled Google+ social network will also be closing on April 2nd.
Despite huge internal backing, Google+ will close after two major bugs were detected in the service, with video call service Allo and URL shortener goo.gl also set to close.
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Mike Moore is Deputy Editor at TechRadar Pro. He has worked as a B2B and B2C tech journalist for nearly a decade, including at one of the UK's leading national newspapers and fellow Future title ITProPortal, and when he's not keeping track of all the latest enterprise and workplace trends, can most likely be found watching, following or taking part in some kind of sport.