Doesn't catch all of the misspellings and punctuation errors!
Don't trust the free basic Grammarly 100%! Grammarly catches a lot of mistakes in writing, punctuation, and spelling. BUT, not all. I have purposely spelled words wrong and put commas where they don't belong just to see if the basic (free) Grammarly catches them. Sadly, most of the time it doesn't! So sad for those who rely on it 100%.