The Apple Watch Ultra 4 Ups Its Game on Heart Rate and Battery Life
Apple's latest flagship watch finally adds a training readiness score, catching up with a feature Garmin and other brands have offered for years. The Ultra 4 and the Series 12 carry new heart rate sensors that Apple says are the most accurate of any wrist or arm worn wearable. That claim rests on Apple's own comparison testing against rival wearables rather than chest straps, so it comes from the seller, not an independent lab. Even so, Outside's reviewer rates the readiness score as simple to read and unusually user friendly, in keeping with Apple's habit of arriving late but polished.
For you: Worth knowing if you are shopping for a wearable, but the most accurate claim is Apple's own until independent testing weighs in.
What it shows: Reported by Outside and not verified by us: we could not trace this story to a published paper, so treat it as news rather than evidence we have checked.