Ontology check
Ontology checker
Drop in an OWL ontology to check modeling pitfalls, metadata, logical contradictions, data constraints and term-registry matches, with a fix for each finding.
Free · Apache-2.0 · OntoCraft
Your files are never sent to a server.
Checks run in Python (Pyodide) inside this browser, so a private ontology does not reach our servers. The first run downloads the checker (Pyodide with rdflib, owlrl and pyshacl) and can take tens of seconds.
Ontology*
Required. Turtle (.ttl), RDF/XML (.owl, .rdf), JSON-LD, N-Triples
Data
Optional. Instance data for SHACL validation and logic checks
SHACL shapes
Optional. Constraints the data must meet