Turnitin is sold to universities, so students usually see its report only after submitting. PaperCheck is a tool you can run yourself before that: it estimates the AI score, marks the lines that read as AI and checks plagiarism against academic sources.
Written by Adithyan, a student who builds PaperCheck. Last updated 31 October 2026.
Turnitin is licensed to institutions, and your college decides whether you can submit drafts. PaperCheck works for anyone with a Google account, with 5 free checks a month.
Turnitin compares your work with the web, publications and its database of student papers, and gives an AI writing score. PaperCheck gives a sentence-level AI estimate in 250-word sections, similar to Turnitin's method, and checks plagiarism against the papers you cite plus arXiv, Wikipedia, Europe PMC and OpenAlex.
PaperCheck is independent and not affiliated with Turnitin. Its score will not match Turnitin exactly. Use it to fix the lines most likely to be flagged before the official check.
No. It is an independent tool that estimates the AI score before you submit.
No. Turnitin is sold to universities, not to individual students.
Check your paper: 5 free checks a month
PaperCheck is not affiliated with Turnitin, GPTZero, papercheck.in or papercheck.ai. Scores from any detector are estimates, not proof.