for people ages 15 years and up (full criteria)
Healthy Volunteers
healthy people welcome
study started
completion around



The purpose of this study is to compare the effectiveness of two mobile health technologies (text messaging or a mobile app) designed to help people take HIV pre-exposure prophylaxis (PrEP) as directed by the clinic. PrEP is the use of a daily anti-HIV medications by HIV-negative people to help prevent HIV infection.


This is a clinic-based, multi-site, randomized, two-arm study to compare the effectiveness of two mobile technologies designed to support PrEP adherence and continuation in cisgender and transgender men who have sex with men (MSM) and transgender women (TGW). All study participants will receive PrEP per standard of care at each of the study sites.

Participants randomized to PrEPmate will receive an interactive bidirectional text-messaging intervention that supports PrEP use through personalized communication between patients and providers. Key components include (1) weekly short message service (SMS) check-ins and a bidirectional SMS messaging platform; (2) customized daily SMS pill-taking reminders; (3) link to online PrEP Basics and videos and testimonials.

Participants randomized to Dot Diary will receive a mobile app that promotes self-management of PrEP use and sexual health. Key components include (1) a digital pill-taking and sexual diary, with pill-taking reminders; (2) sex-positive badges earned via app use; and (3) real-time feedback on protection levels afforded by PrEP. Each participant will be followed for approximately 12 months. Staff at the participating clinics will also participate in in-depth interviews to give feedback on implementation challenges and experiences in the clinic-setting, and experience working with patients using the mobile technologies.


HIV Infections, Sexually Transmitted Diseases, Pre-exposure Prophylaxis (PrEP), HIV Prevention, Mobile health (mHealth), Medication adherence, PrEPmate, Dot Diary, Dot Diary mobile application


You can join if…

Open to people ages 15 years and up

  • Self-identifies as a cisgender man, transgender man (assigned female at birth, trans-masculine spectrum), or transgender woman (assigned male sex at birth, trans-feminine spectrum)
  • Report sex with a cisgender man or transgender woman or any individual assigned male sex at birth in the past 12 months
  • Age 15 years or older
  • Willing and able to provide written informed consent
  • Owns an iOS or Android mobile phone and able to access the internet and send and receive text messages
  • Able to understand, read, and speak English or Spanish
  • Newly initiated PrEP or currently on PrEP and at risk for PrEP discontinuation based on at least one of the following:
    • Initiated PrEP within the past 6 months, or
    • Has any of the following risk factors for PrEP discontinuation: missed clinic visits; age < 30; African-American or Latino; transgender gender identity; or self-reported illicit substance use

You CAN'T join if...

  • Currently enrolled in another PrEP intervention study
  • Unable to complete 12 month study participation
  • Any medical, psychiatric, or social condition or other responsibilities that, in the judgment of the investigator, would make participation in the study unsafe, complicate interpretation of study outcome data, or otherwise interfere with achieving the study objectives.


  • San Francisco AIDS Foundation accepting new patients
    San Francisco California 94114 United States
  • Bridge HIV, San Francisco Department of Public Health in progress, not accepting new patients
    San Francisco California 94102 United States
  • Whitman-Walker Health accepting new patients
    Washington District of Columbia 20009 United States
  • University of Miami accepting new patients
    Miami Florida 33136 United States


accepting new patients
Start Date
Completion Date
Public Health Foundation Enterprises, Inc.
Study Type
Expecting 300 study participants
Last Updated