This document discusses the potential for a mental health app system to help the millions of Americans suffering from mental illness. It notes that nearly 25 million Americans experience serious psychological distress each year, but only a portion receive treatment. It then outlines features of a proposed mental health app system that could increase self-monitoring, reduce emergency room visits and costs, and enable more effective early treatment through data collection. The app system would provide a support network and reporting tools to help and connect patients, caregivers, and clinicians. It argues that such a system could improve health outcomes and lower healthcare costs if designed based on evidence-based practices and efficacy metrics.