How accurate is the Withings ECG?

Short answer: Studies proved that thanks to the Withings ECG, atrial fibrillation was identified with a sensitivity of 96.3% to 99.63% and a specificity of 99.85% to 100%. Three peer-reviewed studies have measured the Withings electrocardiogram against a hospital reference. Two tested the ScanWatch directly against a 12-lead hospital ECG, while the third validated the current detection algorithm across three different Withings devices.