I haven't tried this app but the online calculator seems about right. With the app I calculated 100-108. On a tournament with radar gun they got me at 112. Personally I don't think it's 112 but definitely over 100.
I don't think anyone in my league at my level can serve this hard with some consistency. I get A LOT of free points with the serve.
Yes it's possible for 3.0 to hit somewhat consistent serve (about 60%) at that speed, but I think I'm an exception. Years and years of badminton overheads will get you a leg up on serves