I am happy to inform you all that the ServeSpeed App got accepted and is AVAILABLE!
Here's the link that should take you straight to it:
If you sign up within the App you automatically get send a video that gives you the best tips to measure your serve as accurate as possible.
I am still working on a demo video. I'll let you know as soon as i have it.
About the empirical data question. Currently the App calculates the the speed from when the ball gets hit 'till its landing location. plans are to calculate the initial serve speed in a near update using empirical data.
if you like the App i would really appreciate some positive ratings in the App Store.
if you have something negative to say please email it to me and i'll do my best to come with updates. Hold in mind that this is only version 1.0