Table 2.

Function-related types as defined in the CHARISMHA study, including their superordinate categories, which were used in our manual classification [35].

Category		Description
Category: provision of information
	News	News apps, for example, for professional newspapers or news portals or for patient organizations
	Reference	Apps that provide users with knowledge on health-related topics (eg, reference material)
	Learning material	Apps that provide learning and teaching materials for education and training
	Player/viewer	An app that permits playing or viewing media (eg, music, image data, and videos)
	Broker	Apps that provide targeted information based on collected data (eg, location-based services)
Category: data acquisition, processing, and evaluation
	Decision support	Apps that support decision making based on collected data, based on the definition of decision support according to the study by Shortliffe and Cimino [36]
	Calculator	Apps that perform calculations
	Meter	Apps for immediate measurement of phenomena and characteristics not immediately accessible otherwise, for example, pulse measurement via the camera of the mobile device
	Monitor	An app that may either serve as a measuring tool of its own or connects to a measuring device that is designed for multiple measurements of vital functions and stores them in a diary
	Surveillance/tracker	Apps that automatically and continuously capture certain parameters in the background but do not interpret the data in a medical sense
Category: administrative use
	Administration	Apps for managing administrative data
Category: calendar and appointment-related apps
	Diary	Apps used for detailed data collection and tracking
	Reminder	Apps that remind you of specific tasks
	Calendar	Apps that are used to display and manage health-related events, for example, appointments, in the form of daily, weekly, or monthly overviews
Category: support
	Utility/aid	Apps that can be used as aids and help users to compensate for existing personal limitations (eg, hearing or vision problems)
	Coach	Apps that teach users an activity and help them to carry it out
	Health manager	Apps that are designed to continuously support users in health matters. A combination of several function types is required for an app to be assigned to this function type
Category: other
	Actuator	Apps that produce a direct physical impact in the form of mechanical motion or other physical effects
	Communicator	Apps that are used for communication and getting into contact with others
	Game	Apps that are used for pleasure, relaxation, and enjoyment
	Store	Apps that offer opportunities to buy or sell goods and services
	Other	All apps that cannot be assigned to any of the aforementioned function types