The Theory Explorer lets you select any combination of notes and see them at once on a fretboard, a piano, and a scale circle. As you change the selection, Fretly auto-detects matching chords and scales.
Hear a major triad to get your ear involved:
Great for answering "what is this shape?" or exploring how a chord sits inside different scales. Change the root and everything transposes; switch between note names and intervals to read the structure either way.
Open Theory Explorer