Matt, for Flowstate, they have a massive number of one-star ratings for this. Many complain that their writing disappears, not because of the stopping feature, but because the app quits so frequently. I wonder if you might have some opinions or experiences relative to that. Regardless, thank you for the suggestion of the new tool. More articles like this would be great. I myself have used Hemingway (religiously) for about five or six years now and typically don't write anything of purpose without composing quite a bit of my material there. As you can see, I like to write longer sentences. Hemingway says, "cut that shit out!" And in turn, that makes a difference in my output. I also use ProWritingAid. The only problem is, in many ways, it seems to cater to UK English than USA English. But one you might also check out.