Impactstory - the Plug-In That Allows Users to Browser Open Access Papers - UA Magazine
lterrat's bookmarks 2017-05-02
"This plugin has some weaknesses. For instance, it does not tell if the article is behind the paywall or not while it is still in the list of items displayed by search engines; for example, in the Google Scholar search results. You have to click the article (navigate to the publishing journals’ landing page) to see either the green or the gray lock. Moreover, in many cases what Unpaywall identifies as open access article with the green lock is already, in most of the cases, shown under Google Scholar search results as open articles by indicating the existence of PDF files. Furthermore, Impactstory does not provide a possibility to directly search its database to discover all open access articles readily available for download. It depends on results from other search engines.
Moreover, in most of the cases, Unpaywall shows results from Gold open access (published by paying article processing charges) and green open access (uploaded by authors). Articles which are not under both categories cannot be accessed through Unpaywall. It cannot give access to, for instance, papers under embargo period which typically last up to one year. Most of what are available through Unpaywall are pre-prints. Though it is illegal, it is Sci-Hub that truly tears paywall down.
There are a lot in common between Unpaywall and OA Button, which is already in existence since 2013. Nonetheless, there are other distinct not for profit organizations such as Oalibrary.org and Oalib.com offering direct access to millions of open access articles."