Available on the web, and through mobile apps for Android and iOS, Inbox by Gmail aimed to improve email productivity and organization through several key features. Bundles gathered emails of the same topic together, highlights surface key details from messages, and reminders, assists, and snooze functionality enabled users to control when specific information appears. Updates to the service enabled an undo send feature, a "Smart Reply" feature that automatically generates short reply examples for certain emails, integration with Google Calendar for event organization, previews of newsletters, and a "Save to Inbox" feature that lets users save links for later use.