Turnitin review: our take

Turnitin is the detector students meet most often, because universities license it for plagiarism checks and the AI indicator sits in the same report. Turnitin says the detector keeps false positives under 1% on documents with 20% or more AI writing, measured on 800,000 papers written before ChatGPT. Below 20% it admits errors are more frequent, so those scores show only an asterisk.

Nobody can buy it alone: Turnitin sells institutional licenses with no published price and no individual plan, so a writer cannot run their own work through it first. Vanderbilt switched the AI indicator off over the risk of false accusations. Writers who want a pre-check can use GPTZero or Grammarly, and our AI detectors guide explains how to read any score.

By the Prompt Hackers team · facts checked 4 Oct 2026

What Turnitin does

Turnitin checks student submissions against its databases for similarity and flags passages likely written by AI, inside the reports instructors use for grading. It is licensed to institutions such as schools and universities, not to individuals. Independent writers who need a similarity check are pointed to iThenticate credits instead.

Who Turnitin is for

Best for

universities and schools that already license Turnitin for plagiarism checks
instructors whose institution has switched the AI indicator on

Not for

individual writers or students checking their own work: Turnitin does not sell individual licenses, and AI writing detection is not included in iThenticate's individual credits
low AI scores: Turnitin says false positives are more frequent below 20%, so scores from 1% to 19% show only an asterisk
deciding a case on the score alone: Vanderbilt University disabled the AI detector, citing the risk of false accusations

Turnitin features

F1AI writing detection in the similarity report
F2Similarity (plagiarism) detection
F3Asterisk instead of a score for 1% to 19% AI
F4Grading services: institutional
F5iThenticate credits for independent similarity checks

Turnitin pricing and plans

Pricing verified 4 Oct 2026vendor's pricing page ↗

Plan	Monthly	Billed yearly, per month	What it includes
Institutional license	—	—	sold to schools, universities and organizations; price on request; no individual licenses

Free plan: no. Prices as listed by the vendor in USD, before tax; they change, so check the pricing page before you buy.

Turnitin FAQ

How much does Turnitin cost?: Turnitin does not publish prices; plans are quoted on request.
Does Turnitin have a free plan?: No, Turnitin has no free plan.
What are the alternatives to Turnitin?: Tools that cover the same jobs include GPTZero, Originality.ai, Pangram, Grammarly.

Turnitin