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An open database of 51,362,893 free scholarly articles. We harvest Open Access content from over 50,000 publishers and repositories, and make it easy to find, track, and use. Get the extension.
Access millions of research articles, instantly. Unpaywall users read 52% of research papers for free. Here's how: when you browse to a paywalled paper, we check to see if there's a free copy in our database. If there is, you'll see a green tab on your screen...just click, and read!
PS for the Open Access nerds: the Unpaywall tab can change colors to indicate Green or Gold OA, too. Enable it in settings. You might also enjoy our recent paper analyzing trends in OA and the coverage of Unpaywall.
Search all 120M of our articles, by title. Show only free-to-read. Products & integrations Unsub Chrome/Firefox extension Database snapshot Data Feed REST API Simple Query Tool Library link resolver integration Search articles
Unpaywall finds the kind of articles you'd see in peer-reviewed scholarly journals like Science or PLOS One, plus pre-publication versions of similar work from preprint repositories like arXiv. Specifically, it looks for articles with a kind of identifier called a DOI.
Unpaywall finds OA content in many ways, including using data from open indexes like Crossref and DOAJ where it exists.
OA researchers can use Unpaywall to answer research questions about the current and historical state of open access. There are several popular ways to access the data for research: you can use the REST API, the R API wrapper, the Simple Query Tool, or download the whole dataset.
Team. Unpaywall is a project of OurResearch, a nonprofit building tools to help make scholarly research more open, connected, and reusable. That's us in the picture (clockwise from top): Richard Orr (Twitter), Heather Piwowar (bio, publications, Twitter), and Jason Priem (bio, publications, Twitter).
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...
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