I don't know if these tools are useful for anything more than catching typos. I've taken a few of their suggestions. Still it's ME who decides because, guess who the writer is? It's NOT Grammarly. It's NOT any of the others either. The writer is ME.

I made my own rant here.

https://medium.com/inside-blogging/grammarly-is-to-the-writer-what-the-cleaver-is-to-the-chef-c7c4a3b7e99f