Placed in this section as timing can be stated to be part pf training theory, also its all encompassing not just specific to sprints etc.
https://speedendurance.com/2013/03/04/new-iphone-sprinttimer-coming-soon/
I and a few others on this forum have been privileged to get a heads up on this app and also be part of the beta test.
Myself had great success in using this against electronic timing and also against my freelap (which i still love BTW).
But this development in app software and use is truelly brilliant IMO.
Incidently if your not aware of Sten’s work in apps he has a few other applications that are applicable for the athletic training world. A favorite of mine is the sprint timer which incorporate a starter with reaction time by simply placing the phone on the blocks 🙂 great fun for kids and the adult kids too.
The only limitation at present is these are only available to Apple products (iphone/ipad) and not android.