Grammarly browser extension helps you write mistake-free in Gmail, Facebook, WordPress, Tumblr, Linkedin, and anywhere else you write on the Web. Simply hover over any word with an underscore to correct a mistake. I know as a blogger I need to write correctly so I plan on using this free version and testing it out. There is also an upload tool that you can check your existing document for errors and fix them. The premium version gives you so many more ways to check spelling errors it is for those who need to write essays for schools and yes anyone who writes a lot as it gives you over 250 new checks and even compatible with Microsoft office.
I just used the upload feature to check for spelling error in a review I wrote and it picked up some I did not even realize needed to be corrected which is great.
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