Grammarly is an advanced freemium proofreading tool that scans written text and detects common grammar mistakes, including subject-verb agreement, article use, modifier placement, and more. Grammarly can even detect contextually erroneous words that are spelled correctly but used in the wrong place, such as lose/loose, affect/effect, and many other commonly conflated words. A basic edition of Grammarly is available for free, as a Chrome extension. Plagiarism checking and other advanced features are Premium only.

GrammarlyGO is a generative AI product that accelerates productivity where people write. GrammarlyGO will uniquely use personal, organizational, and situational context—like voice and style, where the user is writing, and their purpose—to generate relevant, tailored communication. With GrammarlyGO, users can rewrite, compose, ideate, and reply within the applications and websites they’re already on—boosting efficiency right in their flow of work.

Grammarly Plagiarism Checker crosschecks text against over 8 billion web pages, detecting plagiarized passages and highlighting sections that have been previously published elsewhere. Also checks and corrects over 250 different types of grammar mistakes, spanning everything from double negatives to faulty parallelisms.