1 Inbox by Gmail Alternatives (Email Services) for OS X with Freemium

Inbox by Gmail was an email service that was developed by Google. It was released on October 22, 2014. It was compatible with Android and iOS.  Inbox by Gmail scans the user’s incoming mail and organize them in a bundle with the title describing the bundle’s content. Example, if you received some gmails for flight tickets, car rentals, and hotel reservation then they will be grouped to the travel bundle. It was a good service but it is not available now. Inbox was shut down by Google on April 2, 2019.