The purpose of this pilot study is to refine a mobile app, based on usability data, from 15 adults living with pulmonary hypertension (PH). The app is intended to reduce symptom burden and improve health-related quality of life for adults with PH, a chronic and debilitating cardiopulmonary condition. Participants will be asked to use the app and provide their thoughts about how to make it better by completing surveys and through interview. We also aim to assess readiness for broader implementation through surveys and targeted interviews with PH providers (N=15). Optimizing barriers and facilitators to implementation and gathering clinician perspectives will inform the design of a future randomized controlled feasibility trial.