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929 million archived student papers

Discourage student collusion, the improper sharing of work both within and across institutions, thanks to our unparalleled index of papers.


67 billion web pages crawled

Protect against search engine plagiarism with our proprietary search algorithm. It crawls and indexes current and archived web pages, and is comparable to major search engines.


178 million journal articles and subscription content sources

Ensure the originality of research papers, theses, and dissertations by comparing them to online and offline subscription content and research titles from 30 leading aggregators, databases and content providers, including:

  • ABC CLIO
  • Cengage Learning
  • EBSCOHost: 2.7m periodicals, biographies, brochures, encyclopedias, magazines, journals, books, and abstracts
  • Emerald Journals
  • Gale: 86m articles
  • Pearson, McGraw-Hill and Wiley: 2,000+ academic textbooks
  • ProQuest: 300,000+ theses and dissertations
  • PubMed/MedLine: 1.4m abstracts and citations; medical resources
  • SAGE Reference: 160+ encyclopedia titles


Exclusive content partnership with Crossref

Feature IV: 50 million journal articles, conference proceedings and books via Crossref Similarity Check from 800+ leading scientific, technical and medical (STM) publishers, including:

  • American Chemical Society
  • American Institute of Physics
  • American Physical Society
  • Elsevier
  • IEEE
  • Institute of Physics
  • Lippincott Williams & Wilkins
  • Nature Publishing
  • Ovid
  • Oxford University Press
  • Sage Publications
  • Springer
  • Taylor & Francis
  • Wiley Blackwell