There are some people who are wondering if it would be possible for them to play a capo on their ukulele. You can sometimes do it if you would like to get a certain tone out of your ukulele that you are not able to get with the standard GCEA.
The capo will allow you to bar the strings of a fret so that you can play differently. It will be essential if you are playing certain songs that are complicated to play without the capo. If you do not have the ukulele capo yet, you can very much use a standard guitar capo. It will work just as well.