“…For example, MONARCA, PRIORI, and Bi‐Affect use patterns of speech and behavior from recorded calls, keystrokes, number of phone calls, and duration of phone calls to predict mood. Wearable devices, such as activity trackers, also offer direct and indirect measurements of a wide range of clinically important variables of BP such as mood, physical activity, heart rate variability, sleep patterns, and circadian rhythms . Yet, it remains unknown whether these passive approaches improve engagement in monitoring compared to active monitoring through smartphone apps.…”