Turnitin – Academic AI & Plagiarism Detector

Turnitin is the global academic integrity platform used by universities, colleges, and K-12 schools to detect plagiarism and AI-generated text in student submissions. Unlike consumer-facing detectors like GPTZero, Turnitin is sold only as an institutional license—individuals cannot buy a subscription directly.

Key Features

The platform combines two core engines: a Similarity database that cross-checks submissions against billions of web pages, 1.8+ billion student papers, and tens of thousands of periodicals and journals; and an AI detection engine that flags GPT-4, GPT-5, Claude, and Gemini output. Turnitin publishes a 98% accuracy claim with a sub-1% false positive rate, though independent research puts real-world detection closer to 85% and ESL false positives at 6–8%. Instructors see a Similarity Report with color-coded highlights, source URLs, and exclusion controls for quotes and bibliography. AI Writing detection appears as a separate percentage score. Turnitin Feedback Studio adds rubric grading, voice comments, and QuickMarks for in-line correction. iThenticate, the sister product, serves researchers and publishers checking journal submissions. Integrations cover every major LMS including Canvas, Moodle, Blackboard, D2L Brightspace, Sakai, and Google Classroom. Multilingual support covers 30+ languages.

Use Cases

University deans roll out Turnitin campus-wide to standardize academic integrity policy across departments. Graduate program directors use iThenticate to screen dissertation chapters before defense committees review them. High school English teachers run final-essay submissions through Turnitin via Canvas, then use the Similarity Report as discussion material in one-on-one student conferences. Research journal editors verify manuscript originality before assigning peer reviewers, catching duplicate submissions and AI-drafted methodology sections. Writing center tutors pull up draft reports during 30-minute consultations to coach students on paraphrasing and citation.

Pricing & Plans

Turnitin uses institutional licensing only—no public pricing page, no individual subscriptions. Schools and universities request a custom quote through the contact form, and an account representative responds within 3 business days. Pricing scales by institution size, student enrollment, and module selection (Feedback Studio, Similarity, AI Writing Detection). Individuals needing plagiarism checks can use iThenticate’s credit-based system instead—buy credits, run scans, no subscription required. Start with iThenticate if you’re a single researcher or freelance editor, request a Turnitin quote when you represent an institution buying for 50+ users.