Mobile health applications (MHA) are increasingly being explored as tools to assist in management of chronic diseases. Little is known regarding which characteristics of MHAs are effective and there is limited data suggesting a real-world impact on health outcomes. Asthma is one of the most common and costly of the chronic diseases, impacting a broad range of the population including both children and adults. It is a variable disease necessitating regular medication use, monitoring of symptoms, and avoidance of specific triggers. These characteristics of asthma make it a chronic disease that is particularly amenable to having an MHA facilitate active monitoring outside of periodic traditional medical visits. The study team has designed a MHA focused on asthma subjects to test the feasibility of an asthma mobile health application (AMHA). The AMHA 2.0 study is the result of a collaboration between MHA developers and Mount Sinai faculty with expertise in the fields of asthma, research design, data storage, and data analysis. AMHA 2.0 incorporated elements of usual clinical care (that may take place during typical office visits), such as medication reminders, a daily asthma diary to track asthma control (AC) and medication use, patient education and assessments of quality of life (QoL), and health care utilization (HCU).