Eustace vs FactVerify

Eustace is a web-based fact-checking workspace for writers and researchers working with AI-assisted drafts. Users can paste text or import a URL, PDF, or Word file; scanned PDFs are processed with OCR. The service extracts candidate factual claims and displays their original quotes so users can select which to verify. Approved claims are checked against fresh web sources rather than the submitted document. Its ledger uses ten verdicts and three confidence levels, and the product says it signals uncertainty when evidence is thin or mixed. Users can inspect sources, attach private evidence, override a verdict with the change recorded, and export a Markdown report with claims, verdicts, confidence, and citations. Eustace says it does not sell user data or use documents to train AI models. The Free plan provides 25 lifetime verifications; Pro costs $19/month for 500 each month, with optional $0.05-per-claim overage turned off by default. Automated verdicts, confidence labels, and summaries can be wrong, incomplete, or out of date, so they are intended to support rather than replace editorial judgment.

FactVerify is a web-based service that automatically checks claims, viral posts, breaking headlines, articles, webpages and documents. It returns an evidence summary, confidence percentage and linked sources. Its four-stage process identifies a testable proposition, uses primary records, examines context and counter-evidence, then produces a calibrated verdict. The retrieval engine can parse court dockets, statutory texts, peer-reviewed journals and agency datasets; listed primary sources also include SEC filings and government datasets. Confidence percentages describe the coherence and corroboration available when analysis runs, not mathematical certainty. Accounts include five automated checks each month, while the homepage offers one check without an account. Real-time checks are private by default and are not indexed by search engines. Selected checks enter a public library with ClaimReview schema, permanent audit links and freshness tracking. FactVerify notes that automated models can miss temporal nuance, sarcasm, complex statutory references or breaking developments, and says the service is informational rather than legal, medical, financial, tax or investment advice.