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AI is confident.
You should be too.
Let Resur reassure you.

Fact verification for professionals who can’t be wrong.

Resur is an MCP server—it works wherever you already use AI

Models & assistants

  • ChatGPT
  • Claude
  • Gemini
  • Perplexity

Coding tools & IDEs

  • Antigravity
  • Claude Code
  • Codex
  • Cursor
  • Gemini CLI
  • GitHub Copilot
  • VS Code
  • Windsurf

How it works

Every claim, traced to a source, and verified.

Resur reads what an AI wrote, breaks it into individual claims, and traces each one back to an authoritative source—labeling it verified, unverified, or contradicted, with the evidence shown. The check runs independently of the model that produced the text; Resur never asks an AI to grade its own work.

The input—what the AI said

“Nvidia became the first company to reach a $1 trillion market capitalization, crossing the mark in May 2023. It was founded in 1993, and its CEO Jensen Huang holds a master’s degree in electrical engineering from Stanford University.”

  1. Break into claims
  2. Search sources
  3. Judge evidence
  4. Verdict
Resur· 4 claims · 3 verified · 1 contradicted

1Nvidia was the first company to reach a $1 trillion market capitalization.

Meaning verifiedContradicted

“Apple has hit the $1 trillion mark, becoming the first publicly traded company in the U.S. to reach 13 figures in terms of market value.”

More detail
Source
cbsnews.com · Apple becomes the first $1 trillion U.S. company
Method
Meaning verified
Date
2018-08-02
Why
Apple was the first U.S. company to reach $1 trillion, on August 2, 2018—nearly five years before Nvidia—so Nvidia was not the first to that milestone.

2Nvidia crossed the $1 trillion market-cap mark in May 2023.

Meaning verifiedVerified

“Nvidia is the latest company whose market capitalization crossed the $1 trillion mark, as its stock jumped more than 4% in early trading Tuesday, before losing a little ground.”

More detail
Source
fortune.com · Nvidia’s market cap tops $1 trillion
Method
Meaning verified
Date
2023-05-30
Why
Fortune reported Nvidia’s market capitalization crossing $1 trillion on May 30, 2023—within May 2023 as claimed.

3Nvidia was founded in 1993.

Meaning verifiedVerified

“In 1993, Huang founded NVIDIA with friends Chris Malachowsky and Curtis Priem, with a vision to bring advanced 3D graphics to the gaming and multimedia markets.”

More detail
Source
computerhistory.org · Jensen Huang
Method
Meaning verified
Date
undated
Why
The Computer History Museum’s profile states Huang founded NVIDIA in 1993.

4Jensen Huang holds a master’s degree in electrical engineering from Stanford University.

Record matchVerified

“He holds a BSEE degree from Oregon State University and an MSEE degree from Stanford University.”

More detail
Source
nvidianews.nvidia.com · Jensen Huang
Method
Record match
Date
undated

Illustrative example. Facts shown are real and were verified against the sources linked above.

What Resur does

1

Claim

One factual statement, pulled from the AI’s answer.

2

Authoritative source

Resur finds where that fact really lives.

3

Check

The claim is matched against the evidence.

4

Verdict + evidence

Verified, unverified, or contradicted—shown.

A verdict with evidence, not a score

Every claim is labeled verified, unverified, or contradicted, with the exact source it was checked against and a link straight to the record. No matching source, no “verified.”

Catches hallucinations

When a claim has no authoritative backing, Resur says so—instead of letting a confident-sounding assertion pass unchecked.

Source-quality aware

Resur weighs whether a claim is verified, requiring primary and authoritative sources over low-quality ones—and keeps looking when the first source is weak.

Runs where you work

One MCP connector adds verification to any MCP-supporting AI client, right where you’re working.

Who it's for

Built for work where a wrong fact has a cost.

Lawyers

Since Mata v. Avianca, a fabricated citation means sanctions—Resur flags a case with no real source before it reaches the brief.

Consultants

One wrong number in a client deck can cost the engagement—Resur checks every figure against an authoritative source first.

Financial analysts

Analysts and bankers build pitch and client decks where every figure has to be right—Resur verifies the numbers against primary sources before you present.

Researchers & academics

A citation has to actually exist and say what you claim—Resur traces each one back to the source it cites.

Journalists & fact-checkers

A deadline is no excuse for an error—Resur checks each claim against authoritative reporting and records.

Healthcare & life sciences

A misread study or wrong figure carries real consequences—Resur verifies each fact against the primary literature.

Pricing

Simple pricing.

Free

$0

20 verifications / month—no card required.

Get early access
  • Per-claim verdicts with evidence, inside Claude
  • Source-quality–aware verification
  • Provenance: live-retrieval vs cited vs unsourced

Professional

Most popular
$99/ month
Get early access
  • Everything in Free
  • Generous monthly verification credits
  • Usage dashboard, history, and API keys
  • Pay-as-you-go after your monthly credits

Firm

Custom

For teams and firms—volume credits, shared billing, and seat management.

Get early access
  • Everything in Professional
  • Single sign-on (SAML / SSO)
  • Centralized admin & billing
  • Pooled credits, seat & credit management
  • Priority support

Stop trusting AI on faith.

We're building Resur now—leave your email and we'll let you know the moment it's ready.

Questions

Frequently asked

What is Resur?
Resur is a trust and verification layer for AI-assisted work. It reads what an AI wrote, separates it into individual factual claims, and traces each claim back to an authoritative source—labeling it verified, unverified, or contradicted, with the evidence shown.
How does it work?
Resur runs four steps: it breaks the response into atomic claims, searches for authoritative sources, judges the evidence against each claim, and emits a verdict. The check runs independently of the model that produced the text—Resur never asks an AI to grade its own output.
Which AI tools does it work with?
Resur is a remote MCP (Model Context Protocol) server, so it works in the AI tools you already use—add it once as a connector. The interactive verification panel renders inline in hosts that support MCP Apps UI—Claude today; in other clients—ChatGPT, Cursor, VS Code, the JetBrains IDEs, Gemini CLI, Windsurf, Zed, and more—the same per-claim verdicts and sources come through as clean text. As MCP Apps support spreads, each new host gets the inline panel the day it ships.
How accurate is it, and how does it err?
Verification is a narrower, more grounded task than generation, but no checker is perfect. Resur is deliberately calibrated toward caution: when evidence is missing or ambiguous it flags a claim as unverified rather than asserting a verdict it cannot substantiate. A false "verified" is the outcome it works hardest to avoid.
What about my privacy?
The only thing Resur receives is the specific claim it's asked to verify. It does not see your AI chat, and it receives nothing else—only the claim to be checked. Anonymous use is supported with no account, and registered users can delete their data at any time. See the privacy policy for the full detail.
How do I start?
Resur is in early access. Leave your email above and we'll let you know the moment it's ready to add.