This is an academic paper that documents the currently available opioid-related smartphone apps and reviews past and existing technology solutions that address opioid use disorder (OUD), including educational apps for prescribers, wearable sensors, and GPS locator apps.
Nuamah, J., Mehta, R., Sasangohar, F. (2020). Technologies for Opioid Use Disorder Management: Mobile App Search and Scoping Review. JMIR Mhealth Uhealth, 8(6), e15752.