What are some alternatives?
When comparing GetHarmony.net and Chordify, you can also consider the following products
yalp.io - Automatic chords extraction from mp3 and YouTube
ChordU - Extracts chords from any song, integrated YouTube.
GUITAA - Turn ANY song into chords, play along with interactive chords and diagram, transpose, loop, tempo control.
Riffstation - The web version is Free and you can learn how to play Chords with Youtube Songs.
Amazing Slow Downer - !A slow down music software for Mac and Windows computers - Amazing Slow Downer
MusicTrans - MusicTrans is a powerful learning tool for playing any song.