HEY is a premium email service launched by 37signals in June 2020.
[1][2][3][4] The service may be accessed through the HEY website and through apps for macOS, Windows, Linux, Android and iOS.
[5][6] Due to the service's vertical integration, a HEY mailbox cannot be incorporated into other email services or stand-alone email clients.
[7] Around the time of HEY's launch, a stand-off between Basecamp and Apple Inc. over Apple's policy on in-app purchases in apps hosted by its App Store was the cause of significant media attention upon Apple's policies.
[8][9][10][11]