Pick a key, then take a progression three ways: a common one by genre, the changes from a song you know, or numbers you type yourself. You get the chords, the shapes to finger, and the substitutions players reach for. Jam mode turns it into a full-screen chart with drums for playing together.
Four beats to a bar. Changing this re-reads every chord length in the new metre and swaps the drums to patterns that fit it.
These are the loop a song is built on, not a transcription. Real arrangements add sections, turnarounds and passing chords the numbers here leave out, and some entries are my best reading rather than gospel.
Type them bare and they space themselves out: 1451 becomes 1-4-5-1. Add b or # to borrow a chord (b7), or letters to force a quality: 57, 2m7, 1maj7, 4sus4, 7dim. Leave a number bare and you get the chord that belongs to the key. Lengths hang off an x: 1x2 is two bars of the 1, 1x2b is two beats of it. A plain number means bars, a number with b means beats. Someone send you a code starting NN1:? Paste it here.
Runs entirely on your device. No account, no internet, nothing sent anywhere.
Keeps whatever is loaded right now, substitutions and capo included. Stored on this device only, never shared.
Moves everything a half step at a time. Use it when the song sits wrong for whoever is singing.
Say where your capo is and every chord is renamed to the shape you actually finger, with the sounding chord underneath. Hard keys become easy ones.
Jam mode takes over the screen: one huge chord readable across a fire, the next one warming up as its turn approaches, and a drummer keeping time. It counts you in, loops until you stop it, and keeps the phone awake. Turn on Shapes to see the grip, or the instrument toggle to hear the chords. Escape or the button at the bottom gets you out.