Grammarly is the standard. Hemingway is very good, too. Bear in mind that no grammar checker can replace a good proofreader: online tools don't spot context, don't fact check and don't understand complex sentences.
For me, I have tried these past few years that Whitesmoke grammar, spell, style, punctuation, and translator checker does a good job.
Depends: the line between editing and proofing moves frequently. The right proofreader knows the subject, so will spot things that they're not sure of and check them.
someone recommends Grammarly to me as well but it required add-on to be installed in browser. The add-on is not open source, is it dangerous this add-on will key-logging for passwords? Any suggestion to avoid this ever happening as for a security concern? thanks
It's my heart felt conviction that any writer worth his/her pay shouldn't have to rely on any sort of grammar tool to get by. If you feel you need one, perhaps you should be trying to make a living by other means. Your command of English or whatever language you are writing in, ought to be good enough to get by without having to rely on such tools. I've never had to use one in my life. I will admit to using a dictionary once in awhile.
People who recommend grammarly don't really have a clue of what else is out there. There are some good, if not better grammar softwares out there. check out ginger software, prowritingaid.com They offer the same, if not better service at a more competitive pric