(A) Scanning of the QR-code and registration. (B) On-screen instructions guide the user to perform high-quality measurements. During the measurement, a screen is displayed with a countdown clock and a real-time photo-plethysmography trace. After each measurement, well-being and symptoms can be annotated. (C) Correct position to acquire a reliable photo-plethysmography signal. (D) Each measurement is automatically analysed by the algorithm. Measurements indicative of an irregular rhythm are reviewed by medical technicians under supervision of cardiologists. A summarizing report includes an overview of the measurements and a general conclusion.