Soundcorset – is both iphone and android – This one is great especially if you are a transposing instrument (not in the concert pitch.) It will show the concert pitch and your note at the same time along with the tuner. Sharp (to right of center) – pull out, relax the embouchure, or don’t bite. Flat (to the left of center) – push in, tighten the embouchure from sides, or focus the air(colder air).