Answered By: Caltech Research Librarians
Last Updated: Apr 27, 2018     Views: 23

iThenticate relies on an extensive and growing database of research documents from 3 sources. (An updated description of these sources is available from iThenticate at

(1) CrossRef's database of journal articles, conference proceedings and books for which they have issued Digital Object Identifiers (DOIs). These research documents come from from 800+ leading scientific, technical and medical (STM) publishers who rely on CrossRef for their DOIs. As part of the agreement with CrossRef, these publishers have agreed to provide to iThenticate the full text of their documents so that the CrossRef portion of the iThenticate database continues to grow as more research is published daily around the world.

(2) Subscription content and research titles from 30 content providers including ProQuest, Ebsco, and other database vendors typically available through college libraries. Theses include in the ProQuest database are included in this portion, but it is important to note that an increasing number of top research universities (including Caltech, Stanford, UT Austin, Georgia Tech) no longer submit their graduate scholarship to ProQuest and are thus not included in iThenticate's similarity check.

(3) Web pages crawled by iThenticate's own search engine, with content dating back a decade and being updated daily.