The best fitness trackers are all vying for our love and money, but it’s not often we see a whole host of them pitted against one another in what is essentially a lab setting.
Rob ter Horst, a data scientist at the University of Vienna and YouTube creator, has taken a look at Apple’s upcoming watchOS 26 update via the public beta, running it on an Apple Watch Ultra 2. He's pitted the Ultra 2 against a series of historic heart rate data he's collected from fitness tracker rivals like the Whoop MG and various Garmin watches, pitting them against his gold standard, the Polar H10 chest strap, to determine accuracy.
