Mobile apps are changing healthcare by allowing custom treatment, quick access to medical research, and enabling physicians to access patient information remotely. The market for mobile healthcare apps is estimated to be worth $400 million by 2016, and over 500 million users will have health apps by 2015. Mobile apps help manage health, promote wellness, and provide medical information. The FDA regulates apps that pose health risks but allows those for self-management, health tracking, and accessing health information. New apps use voice analysis to detect mood changes in bipolar patients and help reduce risky drinking in alcoholics.