Tuner+ for iOS
Tune your Guitar, Bass, Banjo, Mandolin, Cello, Violin, Viola, or Ukulele in seconds.
This app plays perfectly tuned notes for you to match your pitch to. The sounds are both real audio and sine wave form.
This app does NOT analyze the notes of your instrument to tell you if you are sharp or flat. It is just a quick way to get reference notes for ear tuning in any key.