ChordHelper - ChordHelper is a web app that helps musicians of any level make chord progressions from scratch, without having to know any music theory.
ChordIQ - Learn notes, chords, sight reading, perfect pitch and more.
muted.io - A magical collection of interactive music theory tools & visual reference pages for musicians and music producers
Simply Piano - Fast and fun way to learn piano
7Pad Scales and chords - Music instrument and assistant for playing scales and chords.
Strike a Chord - Master the piano with this inventive new app 🎹