Inclusion Criteria:  Self-reported history of hypertension and no hypertensive medication changes in the last 4 weeks. A smartphone with a compatible Apple or Android operating system installed and able to download and use the myBPmyLife app including accepting all permissions A valid email address Fluent in spoken and written English Signed written informed consent. (Note that each participant must be able to consent for themselves.)  Exclusion Criteria:  Contraindication to performing physical activity or following a sodium restriction diet. The participant must be able to walk and eat on their own without assistive devices. Unstable symptoms or markedly elevated BP at enrollment (defined as systolic BP>180 mmHg, diastolic BP>120 millimeters of mercury (mmHg)) Known secondary causes of hypertension (e.g., adrenal insufficiency, pheochromocytoma), heart failure, or end-stage renal disease Difficulty using an upper arm blood pressure cuff due to biceps size or end-stage renal disease or difficulty comfortably wearing a smartwatch Wrist too large to wear a smartwatch comfortably. Daily sodium intake less than 2400 mg/day as measured by the sodium screener Currently pregnant or planning to become pregnant in the next six months