With HealthKit permission granted once, TripRank merges Apple Watch heart rate into each trip after it ends — aligned to the same timeline as speed and G-force. The corner that pulled 0.9G and the pulse across those exact seconds sit on one trace, which turns the after-drive review into a two-channel record: what the car did, and what it cost.
Heart rate is an input to the Ice Veins Score and a control the driver keeps — opt-in through HealthKit, revocable any time. The Watch also works as a remote for starting and stopping trips, keeping the phone docked where it belongs.
