Time Guru by Avi Bortnik. Great metronome with lots of customizations and the ability to randomly have beats drop out to check your time. Excellent. Available for Android and iOS
GarageBand for Ipad.
I think this is perhaps the perfect composers sonic sketchpad. Easy to use multitracking. I have always used GarageBand for sketching ideas, etc. without worrying about sound quality. This makes it so much easier.
These tuners work incredibly well, and now I never leave my black Korg tuner behind at jazz gigs. Android only.
Play By Ear
iOS ear training app with everything from intervals to chords to jazz lines. Well done.
October dates are up now and Westsiders are once again called One Time Spaceman. Identity crisis at it's finest.