What are some alternatives?
When comparing GetHarmony.net and yalp.io, you can also consider the following products
Chordify - Chordify turns any music or song (YouTube, Deezer, SoundCloud, MP3) into chords.
GUITAA - Turn ANY song into chords, play along with interactive chords and diagram, transpose, loop, tempo control.
ChordU - Extracts chords from any song, integrated YouTube.
Amazing Slow Downer - !A slow down music software for Mac and Windows computers - Amazing Slow Downer
Riffstation - The web version is Free and you can learn how to play Chords with Youtube Songs.
GtrLib - Guitar Chords - A vast and comprehensive library of guitar chords with suggested finger positions for every chord.