Technology ecosystems can be called truly unique when users actively use them differently than others. This TUP analysis reviews the activities American adults regularly do with their smartphones, computers, and tablets. It reports on the top 10 activities that are the most unique by ecosystem family – Windows, MacOS, ChromeOS; iOS and Android; and iPadOS and Android. Unique activities are defined as those with the widest range of use, where the difference is widest between the usage percentage between each given operating system family.