I demonstrated these tools, then, gave them a worksheet where they had to run the statistics on some native-speaker writing, such as online articles. Then, they ran the statistics on their essay. It was interesting to see what grade level they were writing at.
I told my students that the reading level for general audiences is a 9. Some useful stats are the average sentence/paragraph. For students who struggled with a lot of choppy sentences, and students who struggled with stringy run-ons, this was helpful to see.