Is there an app, website, anything that checks grammar? things such as where the comma should and shouldn't be, spelling, punctuation, all that. I'm mainly asking this because I've noticed sentences on Facebook pictures that are seemingly grammatically incorrect to me, but it happens so many times. It's making me think I'm the one who's incorrect. I'll give you an example. "The best time to wear a striped sweater, is all the time." I think there shouldn't be a comma in this sentence, but a lot of ppl put a comma in sentences like this and plenty of other sentences that have similar syntax. So, I have two questions; is there a free grammar checker, and does that sentence need a comma? Lol, thanks.