Great app with many features
I like the layout of the pitchpipe and that the pitch plays only while you press it (by default, but you can also set this to sustain the note). Many other options. I also like that you can scroll through and play every octave and it shows the frequencies.
I would like to see a black background for use on stage/etc. when the bright white glow would be inappropriate.
Only thing its missing is a tuner which for a free app I cant really complain.
Doolick about
Pitch Perfect (Pitch Pipe)