If you're looking for a handy guitar app to assist you with your learning endeavors, Fender's Tune Player Pack is currently free on both iOS and Android. With an impressive set of features and an original price of $/£4.99, this is, almost literally, a steal.
Features include the Pro Tuner, access to thousands of chords and scales, Metronome and Find A Beat, which offers 65 drum beats for you to play along with.