Quote Originally Posted by tomilchik View Post
... to fit more than 4 chords in a measure? Say, when I need a chord change on 8th's, as opposed to quarters.?
You could use slashes (like guitar/piano rhythm charts) to indicate the main beats (put them in Staff text either below or moved up above) and a selection of Small and Normal text sizes as Bob has.
Here I used Small chords for eighths ... and doing this, you might have to sacrifice a complex chord quality as it does not fit in the single space - like using F- instead of F-13, otherwise you crash into the next chord/beat.

Some Eighths by Composer


The main limitation is the small size of the iPhone screen! If you wanted to... you could ignore the normal chord layouts and just use Staff text which is small enough to get many more bars along a system, but it won't transpose!