Control the timer from your wrist while your iPhone captures at the finish line.
The RaceTimerPro watch app connects to your iPhone and lets you:
The watch and iPhone communicate via WatchConnectivity. Timer state is synced in real time with updates throttled to 100ms for smooth display without battery drain.
Tip: Place your iPhone at the finish line pointed at the track, then walk to the start line with your Apple Watch. Start the timer from your wrist when the race begins — the iPhone will capture video with the timer overlay automatically.