The site www.wordfrequency.info provides a list of the most commonly1 used words. I'm using that as a proxy for cheap words, meaning a word is expensive if it's not in the list.
If you want to see how expensive your writing is and you have an RSS feed, enter it below. We will compare it to some other feeds. You can do multiple feeds one per line.
One can also just past text into the Prose field to evaluate that text.