Your Smartphone Knows When You're Depressed By Unbranded Editor The Ginger.io app is one of a number of new technologies used by health professionals to track patients’ psychological well-being. WSJ’s Joseph Walker reports. Photo: Getty Published in Wably Technology and Wably Videos depressionginger.iohealthhealth apphealth tracking appjoseph walkermental conditionsmental healthpersonal technologySimon ConstableTHE WALL STREET JOURNALWSJLive