Table 1.

Function modules of HIV prevention app for MSM

Name	Function description
Behavioral assessment	Assessment about user’s unprotected sex behaviors and condom use rate
Behavior change plans	Setting personal goals and plans of health behavior change, and individualized reward/punishment plans
Counseling	Buttons for enter into phone, message, Wechat and email counseling areas
Health education	Knowledge about HIV diagnosis, prevention and treatment, skills of condom using, etc
Personal health records	Uploading HIV/STDs testing results, building personal health records and health promotion plans
Information push	Delivering latest news HIV prevention, treatment and related policies, and reminders of personal behavior, encouragement and advice
Experts encouragements	Videos from professionals and celebrities to encourage user’s adherence to behavior change efforts
Institutions introduction	Providing information about addresses, connection methods, providers and services offered of CDC, hospitals, NGOs nearby
Feedback platform	Building a communication platform where users can give feedback of using the app
Setting	Settings of time period of receiving information, passports of log in the app, latest versions, etc