Grammarly

It keeps me on track and hopefully keeps me from sounding less than intelligent.

It's OK for what it is, a quick check on punctuation and grammar check. I tend to stick commas everywhere and it catches that sort of thing

It picks up on some of the common grammatical issues, but it does not work with quite a number of applications, like Google Docs and yWriter. Another bugbear is that you cannot get it to ignore things it thinks are "errors" and there is a lot of noise as a result. I think https://prowritingaid.com/ is better.