Works Fine
I tuned 3 different guitars (2 electric, 1 acoustic) with the same Fender electronic tuner, had a very experienced guitar tuner check them by ear, and then used this app to test it out. Every string on every guitar was very close and was consistently very slightly on the sharp side. I would trust it now if I didnt have my electric tuner around. Great free app. Works better than the L&M Guitar app.
Cash 66 about
Tuner Tool, Guitar Tuning Made Easy, v1.4