Audio Tuner provides both a spectrum analyzer and tone generator, along with tunings for many musical instruments, enabling you to keep your musical instrument perfectly tuned, simply by playing your instrument into the computer.

Supported instruments include: Guitar, Ukulele, Violin, Piano, Bass Guitar, Banjo, Mandolin, Autoharp and Cello.

To use the spectrum analyzer, you need a microphone, or a method of plugging your musical instrument into your Mac. If you don't have a microphone, you can still use the pitch-pipe.