Inclusion Criteria:  Adults > 18 years of age. Speak and read English. Diagnosis of stage 1* and 2** hypertension (HTN), taking at least one antihypertensive medication. Internet and mobile phone access with two-way texting capability. > 1 on 4-item Krousel-Wood Medication Adherence Scale (K-Wood-MAS-4) or similar tool. Able to download blood pressure tracking App to mobile phone. (*Stage 1 HTN: 130-139 mmHg or 80-89 mmHg16) (**Stage 2 HTN: 140 mmHg or higher or >90 mmHg16)  Exclusion Criteria:  Having been hospitalized within 6 months of starting the study if the patient has a diagnosis of heart failure, end-stage kidney disease, acute coronary syndrome, or stroke. Plans to cancel mobile phone plan within 3 months.