CU+ (Circuit U plus) is an Apps designed to promote health for people living with HIV/AIDS in the setting of Hong Kong. The Apps is developed by researchers affiliated with the Stanley Ho Centre for Emerging Infectious Diseases (CEID), the Chinese University of Hong Kong. Scientific information is presented in this Apps, which is drawn from local and overseas sources specializing in HIV care. Special reference is also made from the 4th edition of the Hong Kong HIV Manual https://hivmanual.hk/, a professional online resource developed by the same research team. Registered users can keep updated on various aspects of health maintenance for people living with HIV.