Pitch Perfect

Pitch Perfect is a tuning program available for Android devices.

If you want to tune yourself or a musical instrument using your phone, Pitch Perfect may be the application for you. The app includes all of the applicable pitches that you would need for just about any piece of music. You simply have to play the pitch first to get an idea of how far off you or your instrument are. It even includes a visual guide for those who have issues reading musical key signatures.

The only downside about this app is that its effectiveness is determined by your speaker quality. However, it's still a great solution for tuning on the go.