Gstring is probably the best tuner I've tried. Solo is fun to play around with for a little while. You can select chords and strum or pick. Haven't really messed with many more than that...Kinda lacking....
I sent an e-mail to Peterson support to make the Strobe Tuner app for iPhone for Android. Wish they would get that going! Also, would like the PRS app for iPhone.
I think Solo would go from a very boring app to a very cool app if they would just animate the strings.
Thanks for recommending TabDroid, downloading that now.