Guitaa is a free online music platform for musicians, that lets them find chords of any song of their choice on Guitar, Piano and Ukulele.
App:
Perfect app for musicians
ChordIQ - Learn notes, chords, sight reading, perfect pitch and more.
ChordU - Extracts chords from any song, integrated YouTube.
Scale Heaven - Browse and play any scale/chord, chord progression.
Chordify - Chordify turns any music or song (YouTube, Deezer, SoundCloud, MP3) into chords.
7Pad Scales and chords - Music instrument and assistant for playing scales and chords.
yalp.io - Automatic chords extraction from mp3 and YouTube