Stumbled upon this yesterday and it was just what I needed. While I could have mucked around and done it myself, this is much faster. There don’t seem to be any strings attached— roll up some random coats of arms, tweak them to suit, and go!
If you like this, you should check out the the author’s adjacent project Azgaar Fantasy Map Generator
I created a couple of coats of arms for myself. This is tool is going to be very handy for me as I will definitely be building a bunch of these for my micro-setting.