Eustace
6.6#8 in ai fact-checking toolsFrom $180 a yearFree planWeb
VisitEustace vs FactGuard
What both publish
| Fact | Eustace | FactGuard |
|---|---|---|
| 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. |
Eustace plans
- FreeFree
- Pro$19 a month
- Pro$180 a year
FactGuard plans
- 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
Pick Eustace if…
Eustace suits writers and researchers who want to review factual claims in AI-assisted drafts and keep an auditable record of verification. Its Free plan may fit occasional checks, while Pro is described for working writers and researchers.
Pick FactGuard if…
FactGuard may suit readers who want claim checks accompanied by reasoning, citations, and a confidence score. Its API and early-access MCP server may interest people seeking integrations, though API access and team pricing are under development.