Eustace vs FactGuard
Eustace
eustace.app
FactGuard
factguard.orgSide by side
| Figure | Eustace | FactGuard |
|---|---|---|
| Price from | $15/mo | $3.08/mo |
| Free plan | Yes | Yes |
| Free trial | — | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| iOS | — | Yes |
| API | — | Yes |
| Plans published | 3 | 8 |
| Spec score · AI Fact-Checking Tools | 8.2 (#6) | 9.1 (#1) |
| Privacy | Eustace says it does not sell user data or use documents to train AI models. | The privacy policy says submitted claims are sent to the backend and are not stored per user on FactGuard’s servers; optional on-device verification is not transmitted to FactGuard or third-party processing providers. |
| 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. | FactGuard checks claims, headlines, or URLs and returns a verdict with reasoning and cited sources. |
| 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. | The privacy policy lists TLS in transit, Firebase App Check, cryptographic nonces for Sign in with Apple, and password hashing by its authentication provider as security measures. |
| Support | The site directs questions and requests to [email protected]. | Support is provided by email, with the support page estimating a response within one to two business days. |
Plans
FactGuard
- FreeFree
- Free / Dev APIFree
- FactGuard Pro Monthly$4.99 a month
- FactGuard Pro, Monthly$4.99 a month
- FactGuard Pro Annual$36.99 a year
- FactGuard Pro, Annual$36.99 a year
- Pro API$49 a month
- Scale API$199 a month
In their own words
Eustace
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.
FactGuard
FactGuard checks claims, headlines, or URLs and returns a verdict with reasoning and cited sources. It offers Quick, Thorough, and Private verification modes, with a confidence score from 0 to 100 and analysis of framing and potential bias. The web app limits submissions to 1,000 characters; its free tier uses Quick mode and displays the 30 most recent checks. The free plan costs nothing, billed forever, and includes three checks per day. Pro includes unlimited checks and history, Thorough verification, all modes, shareable verdict cards, and bulk export, but its listed plans are marked coming soon. FactGuard also describes an early-access MCP server and a Fact-Check API with a stated free tier of 100 calls per day; API access and team pricing are under development. The privacy policy says claims sent to the backend are not stored per user on FactGuard's servers. Optional on-device verification is not transmitted to FactGuard or third-party processing providers. FactGuard cautions that automated verdicts can be inaccurate, incomplete, or out of date and advises checking cited sources.