Open Access Button
The Open Access Button helps you to find legal free-of-charge full text articles and offers an extension for Chrome. If an article is not yet available free-of- charge, the authors are asked to upload it to a repository and thereby to share it. They are supported in doing this legally (for example in the context of a secondary publication right) and quickly, so that everyone receives access, permanently.
According to the operators, the data that the Open Access Button uses include all collected repositories worldwide, hybrid articles, Open Access journals and articles on the personal websites of authors. It includes platforms such as Unpaywall Data, Share, CORE, OpenAIRE, dissem.in, Europe PMC and BASE.