New update makes the UI look unpolished.
While the functions work flawless, please work on the UI so that it does not look like a cheap app. I use an iPhone 6s plus, and the visual resolution of the app looks as if it should run on an iPhone 5, especially the tuner & metronome function.
Horatio Cota about
GuitarToolkit - tuner, metronome, chords & scales, v2.6.0