Fretboard Guide
See what fits, and hear why.
Type a chord progression in any key, loop any part of it, and play along while the fretboard shows what works over each chord as it comes round.
Open Fretboard GuideFree, no account, runs in your browser.
Type it, and it plays
Em7 A7 Dmaj7:2 G:2 — chord symbols or roman numerals, lengths in beats,
bar lines where you want them. Chords, bass and drums follow as you type, and the
necks follow the chord that is sounding.
Shapes you can actually hold
Fingerings are worked out rather than looked up, for 39 instruments from guitar to ukulele to eight-string — and each one is rated for the reach of the hand playing it, including hands that cannot barre or have three fretting fingers to work with.
It tells you why
Ask where the harmony can go after any chord and it ranks the answers with the reasoning attached: how the root moves, which notes are shared, how far the voices travel, what the tritone does, which way the brightness goes.