Best Plagiarism Checker software

Accuracy is independently verified, not just claimed: researchers at the University of Chicago and University of Maryland found Pangram posted the lowest false positive rates against competing detectors, with a documented 1-in-10,000 false positive rate measured across tens of millions of human-written documents.

Segment-level analysis goes beyond a single score by highlighting exactly which parts of a document are AI-generated versus AI-assisted, so mixed human-and-machine writing can be explained with concrete evidence.

Exact plan prices aren't shown on the homepage, and Educational Institution and Enterprise tiers require contacting sales for a quote, so budgeting takes extra legwork.

Plagiarism detection is locked behind paid plans — free users get AI and image detection only, and free image checking is capped at just 3 scans per day.