RefCheck checks each reference against Crossref, OpenAlex, PubMed, arXiv and 6 more scholarly databases and flags AI-fabricated citations and retracted papers. Paste a reference list (APA, MLA, Chicago, Harvard, IEEE, Vancouver or GB/T 7714); each entry gets a verdict with evidence, a corrected citation, and a legal open-access link when available. 3 references free with no sign-up.