It does not support every text editing tool that I use.
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It works well, makes you a better writer, and offers a plagiarism checker to check the work of contractors.
I don't remember doing a demo to get the free tier, but I since have had a demo. In part, I was looking for tools that might interest my clients.
I've looked at crayon.co and it seems to provide info on what competitors are publishing that gives insight into their positioning. There is a free tier.
Oh wow that looks like a very detailed tool, and those email reports could be very powerful. Did you have to go through a demo to get the free tier?