CiteSeerX (formerly called CiteSeer) is a public search engine and digital library for scientific and academic papers, primarily in the fields of computer and information science.

[citation needed] After NEC, in 2004 it was hosted as CiteSeer.IST on the World Wide Web at the College of Information Sciences and Technology, The Pennsylvania State University, and had over 700,000 documents.

CiteSeerX[4] is a public search engine and digital library and repository for scientific and academic papers, primarily with a focus on computer and information science.

Released in 2008, it was loosely based on the previous CiteSeer search engine and digital library and is built with a new open source infrastructure, SeerSuite, and new algorithms and their implementations.

It was developed by researchers Isaac Councill and C. Lee Giles at the College of Information Sciences and Technology, Pennsylvania State University.

Currently, Lee Giles, Prasenjit Mitra, Susan Gauch, Min-Yen Kan, Pradeep Teregowda, Juan Pablo Fernández Ramírez, Pucktada Treeratpituk, Jian Wu, Douglas Jordan, Steve Carman, Jack Carroll, Jim Jansen, and Shuyi Zheng are or have been actively involved in its development.

CiteSeerX crawls publicly available scholarly documents primarily from author webpages and other open resources, and does not have access to publisher metadata.

As such, citation counts in CiteSeerX are usually less than those in Google Scholar and Microsoft Academic Search who have access to publisher metadata.

CiteSeerX data is regularly shared under a Creative Commons BY-NC-SA license with researchers worldwide and has been and is used in many experiments and competitions.

Thanks to its OAI-PMH endpoint,[9] CiteSeerX is an open archive and its content is indexed like an institutional repository in academic search engines, for instance BASE and Unpaywall consumers.