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Eustace

eustace.app

From $15/mo Free plan Web
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Spec score 8.2 #6 of 21 in AI Fact-Checking Tools

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. 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 Automated verdicts, confidence labels, and summaries can be wrong, incomplete, or out of date, so they are intended to support rather than replace editorial judgment.

Spec sheet

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.Read 7 Oct 2026 · eustace.app
Intended users
The site describes Free as covering casual fact-checks and Pro as being for working writers and researchers.Read 7 Oct 2026 · eustace.app
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.Read 7 Oct 2026 · eustace.app
Privacy
Eustace says it does not sell user data or use documents to train AI models.Read 7 Oct 2026 · eustace.app
Support
The site directs questions and requests to [email protected].Read 7 Oct 2026 · eustace.app
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.Read 7 Oct 2026 · eustace.app
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.Read 7 Oct 2026 · eustace.app
Claim review
Eustace presents candidate factual claims with their original quotes and lets users approve which claims to queue for verification.Read 7 Oct 2026 · eustace.app
Document input
Users can paste text or import a URL, PDF, or Word file, and scanned PDFs are OCR'd automatically.Read 7 Oct 2026 · eustace.app
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.Read 7 Oct 2026 · eustace.app
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.Read 7 Oct 2026 · eustace.app
Verdicts
The ledger uses ten verdicts and three confidence levels, and the product says it reports uncertainty when evidence is thin or mixed.Read 7 Oct 2026 · eustace.app
Verification
Each approved claim is checked against fresh web sources rather than against the user's own document.Read 7 Oct 2026 · eustace.app
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.Read 7 Oct 2026 · eustace.app

Plans and prices

Free 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 $19 a month $19/month 500 claim verifications every month · Optional overage at $0.05/claim — off by default · Everything in Free Read 7 Oct 2026 · eustace.app
Pro $180 a year $180/year 500 claim verifications every month · Optional overage at $0.05/claim — off by default · Everything in Free Read 7 Oct 2026 · eustace.app

Every Eustace plan and price →

Strong points and limits

Strong points

  • Accepts text, URLs, PDFs, and Word files.
  • Scanned PDFs are processed with OCR.
  • Users choose which extracted claims to verify.
  • Markdown reports include citations and confidence levels.
  • Free plan includes 25 lifetime claim verifications.

Limits

  • Free verification allowance is limited to 25 claims lifetime.
  • Automated verdicts and summaries can be wrong or outdated.
  • Pro overage costs $0.05 per claim when enabled.

Who it suits

Eustace is aimed at writers and researchers who want to review factual claims in AI-assisted drafts. Its Free plan is described for casual checking, while Pro is for working writers and researchers.

Verdict

Eustace gives editorial users a claim-by-claim workflow with source inspection, recorded overrides, and citation-bearing exports. Treat its verdicts as assistance: the service explicitly warns that outputs may be wrong, incomplete, or out of date.

Where Specifiction places it

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