HealthMindr is a pilot study funded by MAC AIDS Fund to test an HIV prevention mobile app for men who have sex with men in Atlanta and Seattle. The app was built using feedback from focus group discussions with gay and bisexual men and HIV testing counselors in Atlanta, Seattle, and U.S. rural regions. The goal of the app is to help men to assess their HIV risk, build an HIV testing plan, find HIV testing sites, receive customized reminders to get tested, order condoms and HIV testing kits, and identify locations that offer HIV treatment as well as learn about PrEP, nPEP, and STI screening and find locations where these services are provided.