O'FAIRe, the Ontology FAIRness Evaluator, is a methodology to automatically 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 questions/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 AgroPortal users improve the FAIRness of their resources. O'FAIRe is currently implemented in two different public ontology repositories as they offer the required metadata descriptions. In the future, we will deploy the service in other OntoPortal family repositories such as the NCBO BioPortal, Fraunhofer's MatPortal or LifeWatch's EcoPortal.