Mobile UI?

Maybe, for mobile users.

I do have an idea, not really sure about this but what if you make a simple app version of the editor and the project section.(The others are easily accessible through web.)But if you don't want to, you don't need to.

The only way to code on mobile is to use a code editor but you can't compile.

I guess the biggest problem is how to cram all the functionality into the limited space on some mobile devices. Maybe tabbed? Might help to create some dummy layouts, just to get a feeling for it.