Ontology Playground

Ontology Playground is a free web application for learning, exploring, designing, and sharing ontologies. Its interactive graph viewer renders entities and relationships as searchable node-and-edge diagrams with pan, zoom, and property inspection. A curated catalogue provides prebuilt examples from retail, e-commerce, healthcare, finance, manufacturing, education, and other domains. The visual designer lets users create entity types, typed properties, relationships, and cardinalities while viewing changes immediately. RDF/XML and OWL files can be imported, edited, validated, and exported in formats compatible with Microsoft Fabric IQ. An embeddable JavaScript viewer adds interactive ontology diagrams to other websites. The project is fully static with no backend dependency and also includes structured lessons, hands-on learning paths, undo and redo, JSON export, and GitHub-based catalogue contributions.