How I Use It
Setup: You download the extension on your web browser, and the app onto your phone. You can sign in with Google, and then you're off.
Daily Use: Whenever I am typing, Grammarly is quietly in the background assessing my work. It will underline places that it has suggestions about my writing. I can then click the link for the suggestion, and the reason. It has helped me edit misspelled words, as well as taught me additional places that I should be using commas in my writing. If you want to use it to help students advance their vocabulary, it can also make recommendations for that (so instead of a student putting and/and/and all throughout a paper, they can learn some appropriate synonmys in context.
My overall opinion is that this program is great for teaching grammar in context. And while it teaches rules, it does not do so in a route memorization way, but a more organic way (the way most of us learned our first language).