A mobile app is analyzed to determine each UI configuration in a set of UI configurations that is reachable in a possible use of the mobile app. A set of elements used in the mobile app relative to a selected UI configuration from the set of UI configurations is detected. A function performed by a selected element relative to the selected UI configuration is analyzed. The function is matched with a function identified in a hierarchy of elements, the hierarchy being applicable to a plurality of mobile apps. A category of the function identified in the hierarchy is assigned to the selected element. Using the hierarchy, a type of development skill used in developing the selected element is determined. In a blueprint of the mobile app, the category, the type of the development skill, and a numerosity of occurrences of the selected element in the mobile app are output.