https://gadgeteer.co.za/kardiamobile-fda-cleared-clinical-grade-personal-electrocardiogram-ecg-or-ekg-recordings-helping/
KardiaMobile - for FDA-cleared, clinical grade personal electrocardiogram (ECG or EKG) recordings for helping detect Atrial Fibrillation, Bradycardia, Tachycardia or Normal heart rhythm