Abstract: Embodiments prioritize notifications relating to received communication items for display to a user of a computing device. For each received communication item, the computing device searches for related user data items such as calendar data, contacts, emails, and the like. Each of the user data items has a priority value. The computing device calculates a priority score for the notification based on the priority values associated with the related user data items. The notification is displayed among other notifications based on the calculated priority score relative to the priority scores of the other notifications. In some embodiments, the notifications include an ordered set of notifications displayed as tiles on a user interface of a mobile computing device.