Without a capo applied to a song, changing the key is simple: pick the key you want the song played in and Chordle transposes it immediately:

Keeping the underlying key the same

With Maintain key when changing capo enabled, the uncapoed key will not be changed when the capo position is adjusted. As you move the capo up, the capoed key moves down, so the song still sounds in the same key.

This is useful if you have to play in a particular key, but want a capo so you can use chord shapes you know.

Keeping the capoed key the same

With Maintain key when changing capo turned off, the capoed key stays the same when you move the capo. As you move the capo up, the uncapoed key moves up with it, so you keep playing the same chord shapes.

As a guitarist you can use this to increase the pitch of a song without changing the chord shapes. If you were to share the song with a keyboard player using Chordle showing the uncapoed chords, they would be shown the key that they needed to play in to match yours.

Changing song keys in set lists

Changing a song’s key in a set list won’t change it anywhere else. Your library version and other set lists will keep their original keys. This allows you to have different versions of the same song in different set lists, useful if you want to play the same song in different keys on different occasions.

When the set list panel is open, the key picker is shown to the right of the song title in the set list.