Consumer wearables enable continuous cardiac monitoring through photoplethysmography and electrocardiography. Twenty per cent of Danes now share wearable data with physicians. Evidence shows high accuracy for atrial #fibrillation (AF) detection, but anticoagulation for device-detected AF remains controversial. Ethical challenges include data quality, interoperability, health equity, fairness and privacy. While patients increasingly use wearables, clinical integration requires standardisation, clinician education, and evidence-based guidelines to balance opportunities with limitations, as argued in this review.