RecruitingBehavioural interventionHTN App for HTN Control and Cardiovascular Health Among African-AmericansThe purpose of this study is to test the hypertension (HTN) app-based intervention to see if it is more effective in improving uncontrolled HTN and HTN self-care among Africian-Americans from baseline to post-intervention (immediate, 3 months and 6 months post-intervention) as compared to the standard of care.