Recognizing their duty as research funders and in order to support efforts towards open access publication of research results, an informal group of Research Funding Organizations, later joined by large philanthropies, called cOAlition S set up Plan S which in its current form states that “With effect from 2021, all scholarly publications on the results from research funded by public or private grants provided by national, regional and international research councils and funding bodies, must be published in Open Access Journals, on Open Access Platforms, or made immediately available through Open Access Repositories without embargo.” The SOAR project will aim to support Plan S implementation by 1. Helping grantees researchers identify Plan S compliant publishing venues offering a route to compliance with Plan S and Horizon Europe requirements on open access, via the development of an online Journal Checker Tool ; 2. Supporting European and international activities to foster policy alignment with Plan S by more funders, and to grow cOAlition S and 3. Fostering communication and increased engagement with research communities. The project will be led by the European Science Foundation, in close collaboration with the Open Access Champion appointed by cOAlition S. The desired impact of the project will be increased support for Plan S and Open Access, contributing to Horizon Europe priorities on Open Access.