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When a document is checked in Similarity Check, it is compared with the content of this database which is made up of published and unpublished documents, including over 40 million research articles, conference proceedings, and e-books from scientific, technical, and medical publishing. It includes material behind journal paywalls that would not be available from a simple internet search. 

Getting started with


Crossref Similarity Check

Cochrane Review Groups (CRGs) are encouraged to use Similarity Check via the licence held by the publisher of the Cochrane Library, John Wiley & Sons. Wiley provides each CRG with access to Similarity Check (free of charge). For a user name and password, Managing Editors can contact Tony Aburrow (, Cochrane Editor, Wiley.