This is a two-arm randomized-controlled trial (RCT). All subjects will be randomized either to the intervention arm and receive the Epic Allies intervention branch of the app or to the control arm and receive the phone-based notifications only control branch of the app. Randomization will occur in a 1:1 ratio within each of the two groups (new-to-care and ART-non-adherent) separately, with an equal number of subjects in the intervention and control arms. During the 26-week intervention phase, intervention arm subjects will receive the daily adherence reminders they set up through Epic Allies with tailored feedback for encouragement and reinforcement. Intervention arm subjects will have 24-hour access to all features of Epic Allies. The control arm subjects will receive weekly phone-based notifications to encourage them to view educational information presented in the app. Subjects will attend study visits at Week 13 (during intervention phase), Week 26 (end of intervention phase), and Week 39 (post-intervention phase). In-depth qualitative app satisfaction interviews with a subset of intervention arm subjects will also be conducted to evaluate acceptability of the app and its potential to improve engagement in care, uptake of ART, and ART adherence. Outcome measures will include engagement in care, ART uptake, ART adherence, viral load (VL) change, and VL suppression. The in-depth qualitative app satisfaction interview will assess intervention impact, acceptability, and long-term sustainability.