PAIrWatch is the world's first multi-sensor wearable Tonoarteriographic (TAG) product enabling continuous blood pressure (cBP) monitoring and closed-loop hypertension management beyond intermittent cuff-based ambulatory BP monitoring (ABPM). It integrates πRing, πWatch, and Dr. π (Personalized AI Doctor, Dr. PAI) in a coordinated Ring–Watch–AI architecture. Continuous cuffless BP sensing from πRing, combined with medical-grade cuff-based BP references from πWatch, reconstructs TAG/cBP waveforms that capture beat-to-beat dynamics missed by ABPM. Dr. π/Dr. PAI integrates TAG/cBP, multimodal physiological signals, personal history, symptoms, and cardiovascular knowledge for abnormal-pattern detection, risk assessment, and personalized guidance. πWatch provides TAG/cBP display, standalone 4G connectivity, and real-time alerts. Abnormal physiological changes can trigger calming music and communication with family or caregivers, forming a closed-loop sensing–feedback–therapy pathway for hypertension management. The underlying closed-loop prototype received the Gold Medal at the 49th International Exhibition of Inventions Geneva. PAIrWatch is currently under NMPA and FDA regulatory review.