Is there a free app for a plagiarism checker?

Community Novice

I had a teacher ask me if there are any free apps (LTIs) for plagiarism checkers in Canvas. He said that he found one called Unplag, but it will cost him $60 a year to use. He wants me, as the district admin, to add it to all accounts. However, I can't add anything that costs without going through a lot of red tape. Does anyone know of any free ones that I can have him add to his or out district Canvas site. As always, thank you for all of your support. Couldn't do this job without your help.