In order to make Open Access publishing easier for researchers, Leiden University Libraries’ colleague Rutger de Jong has written a tool that shows the Open Access options of an article. All you need to do is simply fill out the DOI.
The tool firstly checks whether there is an Gold Open Access publisher’s version available; this is followed by a second check to see if a Green Open Access author’s version is already online; thirdly, the tool consults the SHERPA /ROMEO database to determine the publisher’s policy on allowing the author to post a preprint or postprint in a repository.
The next step is to increase your reach and visibility by uploading it to the Leiden repository.
Please check the tool at: https://library.tips/open-access-tools/green-options/
It is still work in progress: any feedback is welcomed at firstname.lastname@example.org