Grammarly is a web browser and a desktop addon that helps you write mistake-free on almost every text editor you use on the web (WordPress editor, Plugins editor, Social Media editors, GMAIL, Google Docs, Microsoft Office). It scans your text for common and complex grammatical mistakes, spanning everything from subject-verb agreement to article use to modifier placement. If you use the Grammarly text editor, you can set the context of your copy and choose the language (US English or UK English you wish your copy to be scanned for. The free version of the addon is helpful enough for simple copies, daily messages, emails, short posts. If you extensively write on your blog/website, or if you are working as a witter or as a content editor then you may consider the premium subscription of Grammarly which will work as your virtual partner.