Chordio: compose & learn music

Introducing Harmony Explorer A brand-new tool for understanding and building richer chord progressions, right from the Composition workspace. Detected Scales: Instantly see which scales fit the chords already on your canvas, and click any match to set it as your song's key. Chord Suggestions: Browse chords organised by function, including Chords in Key, Borrowed Chords, Secondary Dominants, Tritone Substitutions and Cadences. Preview any chord, then add it to your progression with a single click. Relationship Colours: Turn on relationship colouring to see, at a glance, how every chord in your progression relates to the key, with colour-coded borders and Roman numeral badges for diatonic, borrowed, secondary dominant, tritone substitution and chromatic chords. Flexible Key Selection: Explore any major or minor key using the built-in key picker, follow the key of whichever chord you select, or automatically match your song's key signature. On Mac, Harmony Explorer opens in its own resizable window, so you can keep it open alongside your composition. Faster Chord Editing Right-click any chord cell to change its quality or extension on the fly, choosing from Major, Minor, Dominant and Suspended chord families without rebuilding the chord from scratch.