Is there such an app that would give you a visual representation of the available space on your units media card (just like in windows)?

This would be a highly useful application.

I have not seen or heard of an app for that. You can check the media card space by going to Options > Media Card however.

thank you

I am aware of that.

I would however like to see an app that is a graphical representation of that information (in the form of a pie chart) such as in the windows OS.