CardioSignal is a smartphone application designed for early detection of atrial fibrillation, a common heart rhythm disorder often with subtle symptoms. Users can take a one-minute measurement by placing their phone on their chest. The app, validated with 96% accuracy in clinical studies, can also track vitals like heart rate, though these are for wellness purposes. Regular use is encouraged through reminders and health insights, and detection of potential atrial fibrillation warrants a consultation with a healthcare professional. The service is available via subscription in numerous European countries and India, offering various payment methods.