 This study has three phases, usability testing, field testing, and a randomized-controlled trial RCT. In usability testing the investigators will test beta versions of the app and gain feedback about the intervention from the target population, identify any technical issues, and get feedback on app content. Field testing is to ensure that the features, platform and content of P3 and P3 are acceptable to the target population and that there are no technical challenges or user concerns with either the app, the dried blood spot DBS, hair, or mitra sampling collection. 