Turnitin, LLC

Turnitin is an Internet-based similarity detection service run by the American company Turnitin, LLC, a subsidiary of Advance Publications. The software as a service (SaaS) website sells automated checks of submitted documents against its database of prior submitted documents and the content of other websites to identify plagiarism. As of 2025, the company licenses access to its services to over 16,000 universities and high schools worldwide, with more than 71 million students enrolled, but as early as 2006, Princeton, Harvard, Yale and Stanford decided not to use Turnitin.