Unpaywall FAQ

Paper version definitions
Unpaywall reports three categories of paper version, based on the DRIVER Guidelines v2.0 VERSION standard (with our descriptions) PublishedVersion: The do...
Thu, 21 Feb, 2019 at 12:47 PM
What do the types of oa_status (green, gold, hybrid, and bronze) mean?
Unpaywall assigns an OA Status to every article, which you can find in the oa_status field of the API and dataset. There are five possible values: closed, g...
Sun, 11 Aug, 2019 at 2:56 PM
Why does the Unpaywall plugin say this paywalled article is Open Access?
In addition to using our API, the browser extension looks for a PDF link directly in the page content and, if one is found, displays it as a Bronze OA icon....
Fri, 9 Aug, 2019 at 1:40 PM
How do we decide if a given journal is fully OA?
We set the oa_status of an article to “gold” if that article is published in a fully OA journal. We have three steps to decide if a given journal is fully O...
Wed, 4 Sep, 2019 at 12:39 PM