How does PhilPapers compare to Philosopher's Index?

As the table below shows, PhilPapers' coverage of the philosophical literature is significantly more extensive than Philosopher's Index, both for online material and for offline material. These data are current as of February 2017. Philosopher's Index data were taken from their web site at

PhilPapers Philosopher's Index
Books and articles indexed 2,246,838 600,000
Journals represented 4,673 1,700
Full text links All online content 200 journals
Index entries with abstracts 435,632 320,613
Open Access archives indexed 1,452 0
Open access pre-prints indexed or archived 345,257 0
Professional pages monitored 2,150 0
Update frequency
continuously quarterly
104 37

In addition to providing a better coverage of the philosophical literature, PhilPapers has several widely used features not found on Philosopher's Index:

  • Index entries are organized in over 5,000 fined-grained topical bibliographies that are maintained by over 650 academics. This is in addition to keyword tagging using thousands of keywords.
  • PhilPapers provides pointers to all the copies of a work found online, whether in Open Access archives or behind publishers' pay walls.
  • Links to subscription-based resources can be made to point to your reverse proxy server for convenient, one-click access.
  • Users can organize their references on the site in reading lists and bibliographies that can be exported to (or imported from) all major bibliographic formats as well as RefWorks.
  • Pre-prints can be archived on PhilPapers itself for optimal exposure.
  • New content can be monitored using flexible email alerts (every search or page can be turned into an email alert). Tens of thousands of academics are subscribed to our alerts.
  • Publication lists can be embedded on personal or departmental sites using our API.
  • PhilPapers is available from anywhere and any device 24/7 without jumping through any authentication hoops (so long as your institution subscribes).

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