Which Originality.ai AI Detector Is Most Similar to Turnitin?

Based on an Originality.ai study of 300 student essays, the 40% AI Allowance setting produced results most similar to Turnitin among the Originality.ai settings tested.
At this setting, Originality.ai and Turnitin agreed on the Human-versus-AI classification of 69.7% of documents. When Originality.ai classified a document as Original, Turnitin also placed it below the study’s comparison boundary in 96.3% of cases.

Note: Originality.ai and Turnitin are separate AI detection systems. The 40% AI Allowance setting does not predict or reproduce a Turnitin result, and the scores from the two tools should not be compared directly.

What should I use?

If you're looking for an Originality.ai setting that most closely resembles Turnitin's results in this study, select 40% AI Allowance.
AI detection results should always be considered alongside other evidence of authorship, such as drafts, notes, sources, and document history.

Learn more

For the complete methodology, results, and limitations, read the full Originality.ai study: What AI Detector Is Most Similar to Turnitin? We Tested 300 Student Essays.

Updated on: 19/08/2026