Many universities use for student submissions. While not identical to iThenticate, it uses similar databases. Ask your professor to enable “draft checking” so you can self-screen before final submission.
Unlike some consumer tools, iThenticate does not offer a "gratis full" version or a standard free trial to individual users. ithenticate gratis full
Dark web marketplaces sell shared university logins that include iThenticate access. Using these is a felony under the in the US and similar laws globally. Universities routinely audit login IP addresses; if your location doesn’t match the student’s, both you and the credential owner face expulsion or termination. Many universities use for student submissions