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Eustace
What it is
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. Eustace identifies candidate factual claims and shows their original quotes so users can choose which claims to verify. Approved claims are checked against fresh web sources rather than the imported document. The ledger uses ten verdicts and three confidence levels, and the service says it signals uncertainty when evidence is thin or mixed. Users can inspect sources, attach private evidence, override verdicts with the override recorded, and export a Markdown report containing claims, verdicts, confidence, and citations. The Free plan includes 25 claim verifications for lifetime use. Pro costs $19 a month and includes 500 verifications each month; optional overage costs $0.05 per claim and is off by default. Eustace says automated verdicts and summaries can be wrong, incomplete, or out of date.
For and against
For
- Accepts text, URLs, PDFs, and Word files
- OCR processes scanned PDFs
- Shows original quotes for candidate claims
- Markdown reports include citations and confidence
Against
- Free plan includes 25 verifications for lifetime use
- Pro costs $19 a month
- Automated verdicts and summaries may be wrong or outdated
The verdict
Eustace provides a claim-by-claim workflow with sources, uncertainty indicators, and exportable reports. Its automated results are intended to assist editorial judgment, not replace it.
Who it suits
Eustace suits writers and researchers who want to review factual claims in AI-assisted drafts. Its approval step and source inspection tools leave editorial decisions with the user.
Plans and prices
Free
25 claim verifications, yours to spend anytime · Unlimited projects and documents · Full ledger, overrides, and Markdown reports
Read 7 Oct 2026 · eustace.app
Pro
500 claim verifications every month · Optional overage at $0.05/claim — off by default · Everything in Free
Read 7 Oct 2026 · eustace.app
Pro
500 claim verifications every month · Optional overage at $0.05/claim — off by default · Everything in Free
Read 7 Oct 2026 · eustace.app
On the record
- AI processing
- The policy says AI model providers receive document text and claims for extraction and verification, while Tavily receives search queries derived from claims rather than the whole document.eustace.app · read 7 Oct 2026
- Audit and export
- Users can inspect sources, attach private evidence, override verdicts with the override recorded, and export a Markdown report with claims, verdicts, confidence, and citations.eustace.app · read 7 Oct 2026
- Claim review
- Eustace presents candidate factual claims with their original quotes and lets users approve which claims to queue for verification.eustace.app · read 7 Oct 2026
- Document input
- Users can paste text or import a URL, PDF, or Word file, and scanned PDFs are OCR'd automatically.eustace.app · read 7 Oct 2026
- Integrations and processors
- The privacy policy names Supabase, Vercel, Anthropic via Vercel AI Gateway, Tavily, RevenueCat, Stripe, Cloudflare, and Sentry as processors or service providers.eustace.app · read 7 Oct 2026
- Intended users
- The site describes Free as covering casual fact-checks and Pro as being for working writers and researchers.eustace.app · read 7 Oct 2026
- Privacy
- Eustace says it does not sell user data or use documents to train AI models.eustace.app · read 7 Oct 2026
- Purpose
- Eustace is a fact-checking workspace for writers and researchers who work with AI; it extracts factual claims from drafts and checks approved claims against independent evidence.eustace.app · read 7 Oct 2026
- Security
- The privacy policy says data is encrypted in transit with TLS and at rest by infrastructure providers, production data access is restricted, and database rows are isolated per account.eustace.app · read 7 Oct 2026
- Service limitation
- Eustace says automated verdicts, confidence labels, and summaries can be wrong, incomplete, or out of date, and are intended to assist editorial judgment.eustace.app · read 7 Oct 2026
- Support
- The site directs questions and requests to [email protected].eustace.app · read 7 Oct 2026
- Verdicts
- The ledger uses ten verdicts and three confidence levels, and the product says it reports uncertainty when evidence is thin or mixed.eustace.app · read 7 Oct 2026
- Verification
- Each approved claim is checked against fresh web sources rather than against the user's own document.eustace.app · read 7 Oct 2026
- Verification limits
- The free plan has a fixed lifetime allowance of 25 claim verifications; Pro includes 500 per month, with optional overage at $0.05 per claim, off by default.eustace.app · read 7 Oct 2026
