While substance use is one of the most consistent predictors of poor adherence to antiretroviral therapy (ART), few studies among\npeople living with HIV (PLH) have utilized mobile phone-based assessment of these health behaviors. PLH were recruited from\nprimary care clinics to report ART and substance use using a smartphone application (app) for 14 consecutive days. The app�s\nfeasibility as a data collection tool was evaluated quantitatively via surveys and qualitatively via in-depth interviews to assess daily\nreport completion, compliance, and study satisfaction. Overall, 26 participants (M = 49.5 years, 76% male) completed 95.3% of\ntime-based daily reports. Participants reported high satisfaction with the app and expressed future interest in using smartphones\nto report daily behaviors. High completion rates and participant acceptability suggest that smartphones are a feasible, acceptable\nmethod for collecting substance use and ART data among PLH. Potential areas of concern such as sufficient training and assistance\nfor those with limited smartphone experience should be considered for future app-based research studies among PLH.
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