P3 (Prepared, Protected, emPowered)

Inclusion Criteria: * Are aged 16-24 * Were assigned male sex at birth * Report sex with men or transgender women * Are able to speak and read English * Have reliable daily access to an Android or iOS smartphone with a data plan * Are HIV-uninfected (self-report) * Are not currently on PrEP but plan to initiate in the next 7 days and have an active PrEP prescription (prescription confirmed by study staff) OR on PrEP have an active PrEP prescription (prescription confirmed by study staff) * Recruited from one of 9 subject recruitment venues (SRV) cities (Atlanta, Georgia; Boston, Massachusetts; Bronx, New York; Chicago, Illinois; Houston, Texas; Philadelphia, Pennsylvania; Tampa, Florida; Chapel Hill, NC; Charlotte, NC) Exclusion Criteria: * Aged younger than 15 years or older than 24 years * Not available to meet with project staff for planned study visit(s) * Non-English speaking * Living with HIV * Not currently prescribed PrEP (study staff unable to verify participant has an active PrEP prescription by a health provider) * Anticipate not having reliable access to a smartphone with a data plan for 2 or more days during field testing or 1 or more weeks during the RCT intervention period * Planning to move out of study area during the study period * Unwilling or unable to comply with protocol requirements. * Participated in field trial phase of P3 study * Unable to be consented due to active substance use or psychological condition.