O’FAIRe, the Ontology FAIRness Evaluator, is a methodology to automat-ically assess to which level a semantic resource or ontology respects the FAIR Principles. This paper describes the online tool implementing O’FAIRe within the AgroPortal ontology repository, through 61 ques-tions/tests, among 80% are based on the ontology metadata description. For a specific ontology or a group of semantic resources, O’FAIRe web service outputs both global and detailed scores (normalized) against the 15 FAIR Principles. O’FAIRe results are visualized and explained with new specific user-friendly interfaces (such as the FAIRness wheel) in order to help Ag-roPortal users improve the FAIRness of their resources. O’FAIRe is current-ly implemented in three different public ontology repositories as they offer the required metadata descriptions. In the future, we will deploy the service in other OntoPortal repositories.