Software as a service (SAAS) services featuring software using artificial intelligence (AI) for fact-checking and verifying the accuracy of AI-generated content with citation validation and source grounding; Platform as a service (PAAS) featuring computer software platforms for retrieving, checking, and citing factual claims across multiple subject domains; Providing temporary use of online non-downloadable computer software applications for fact-checking, source verification, and citation generation; Software as a service (SAAS) services featuring software using retrieval-augmented generation (RAG) for fact-checking AI-generated content by retrieving and citing authoritative sources