WYSIWYG For Material UI?

Anyone know of a WYSIWYG editors for the same/similar material UI that PSU uses? Sometimes I just want to quickly mock up some elements on screen while brain storming without writing any code. I did find https://shuffle.dev/, but can’t really justify the price for it at the time. Hoping to find something opensource(free) that I could just spin up in docker or use online. Doesn’t have to allow saving or output the code really just for the visual aspect of it.