Writers and students need two things: clear, correct prose and work that is genuinely their own. A free grammar checker catches spelling, punctuation, and style issues. A text similarity checker shows how much two pieces of writing overlap, which is useful when you are comparing drafts or checking a quote against its source.
Our grammar checker sends your text to a language-analysis service, which returns suggested corrections. Our similarity checker is different: it compares two texts that you paste in and reports how much wording they share. It does not search the web or any database, so it cannot tell you whether a passage exists somewhere online. If you need that, use a dedicated plagiarism service such as Turnitin or Copyscape.
Try our Grammar Checker to tidy up your writing, and our Text Similarity Checker to compare two documents side by side.