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.
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Chordify - Chordify turns any music or song (YouTube, Deezer, SoundCloud, MP3) into chords.
muted.io - A magical collection of interactive music theory tools & visual reference pages for musicians and music producers
yalp.io - Automatic chords extraction from mp3 and YouTube