Table 3.

Summary of the suggestions provided by the youths for mobile health app features.

Function of feature, feature		Definition	Illustrative quotes
Ease of use
	Reminders	Notifications reminding clients to complete their tracking	…You’d want the app to send you some sort of notification. Like, ‘hey little check in: did this happen? Do you want to log it? [Youth 9]
	Connecting to computer	Usable on multiple technological platforms	…Something that can connect to my computer would be nice. [Youth 7]
Improve appeal of use
	Attractive design	Having an aesthetically pleasing and simple layout	…You should be able to go in and not get frustrated while doing what you need to do. [Youth 2]
	Customization	Ability to personalize activities and data input	…I like how many options they have for tracking things. It makes it feel a lot more personal. [Youth 5]
	Reinforcement	A feature that rewards activity completion	…When you meet your goal, everybody wants a little pat on the back. [Youth 3]
Provide additional information
	Communication with provider	Enabled communication between client and provider outside of sessions	…It would be great if there could be a messaging system where the therapist asks you questions about things that you say. [Youth 4]
	Output to client	Organize/summarize data for easy review	…Charts are important because it’s a visual way to see the progress you've made or if you're slipping. [Youth 1]
	Additional resources	Clients or providers able to add relevant information to be accessed between sessions	…It would be great if skills you used could be saved. [Youth 4]