Overview

• The feature will ship in watchOS 26 to Apple Watch Series 9, 10, and 11 and Apple Watch Ultra 2 and 3, with SE models not supported.
• Availability begins next week in more than 150 countries and regions, with some markets contingent on local regulatory clearance.
• Using the optical heart sensor, the watch analyzes blood‑flow patterns over rolling 30‑day periods to flag signs consistent with chronic high blood pressure.
• Apple instructs users who receive an alert to log seven days of readings with a validated cuff and share results with a healthcare provider in line with AHA guidance.
• Apple reports training data from over 100,000 participants, clinical validation in studies of more than 2,000 people, 95.3% specificity, and a projection to alert over 1 million undiagnosed users in the first year.