This app is a favorite of heart rate researchers (it was even used in the study mentioned above). Like Cardiio, this heart rate monitor is free to use, but nearly everything else is behind a ...

Look at the photo of the woman using the app: see the icons for different spatial sound profiles – and crucially, the separate button labeled 'Heart Rate'? The images also back up data found in ...

a heart-rate monitor in the companion app. The rumor mill's really ramped up a gear in the past couple of weeks, most recently thanks to MacRumors (who spotted a hidden line of code in iOS 18 ...