I think the only ones what do as of now are the apple workout app and another one called Pear.
Never quite got the 3-2-1 Go way of starting. So when a race is about to start you either miss 3 seconds or try and start 3 seconds early?
Enable auto pause, start the app a minute before race starts. DONT MOVE. Time will start when you set off!?
I turned off the 3-2-1 countdown in the Nike Run Club app on my phone and thereafter don't see a countdown on my watch.