While the citation databases Web of Science and Scopus are widely used in academic libraries to support research-related bibliometric services, there is growing interest in open alternatives that have emerged in recent years. In particular, the OpenAlex service from the provider OurResearch is considered very promising in both scientific research and applied bibliometrics. However, there are questions regarding the coverage and quality of the open data source in comparison to the established bibliometric databases. Bernhard Mittermaier, Head of the Central Library of the Forschungszentrum Jülich, will give a talk and explain the extent to which OpenAlex can be an alternative to proprietary databases in library practice and what its influence on Diamond OA publishing can be.