Bianca Schweighofer and Julia Bartlewski write: “The transition to open access has increased the visibility of scholarly work, but understanding and managing publication costs remains complex. Shifting from subscription-based to fee-based or institution-financed models fundamentally changes processes, financial flows, and the roles of stakeholders. Additionally, the lack of cost transparency from publishers poses significant challenges for institutions and researchers, who often face hidden or unclear fees, making budgeting and financial planning more complicated. Our project, openCost, addresses this issue head-on.”