Vurl.

Evidence infrastructure for the AI web

Does the URL
actually say that?

Vurl reads the page, locates the exact wording behind a claim, and freezes it — text, timestamp and hash — into a permanent passport. Citations keep their evidence even after the page changes or disappears.

How it works Built for agents

Check a claim

01 / TRY IT

Watch an example, or click the form to try it yourself. Vurl reports what the page says. It does not decide whether the claim is true.

VerbatimThe exact span, with its character offsets in the frozen text.
PermanentA passport that still resolves after the source changes or dies.
CallableA JSON API and an MCP server, for agents that cite.
POPULAR WORKFLOWS
Explore all tools
01Check a claimFind the exact passage behind a statement. 02Check an AI answerReview what every linked source actually says. 03Research a claimBuild a source-bounded research plan. 04Audit before publishingReview authors, dates, citations and metadata. 05Compare two pagesSee wording that was added, removed or changed. 06Explore all toolsFind the workflow that matches your task.
02 / HOW IT WORKS

Check what a link
actually says.

Paste a link, tell Vurl what you want checked, and get a result you can share.

STEP 01

Paste a link

Copy the web address of an article, report, or PDF and paste it into Vurl.

STEP 02

Type the claim

Write the statement you want to check, such as “This article says coffee improves memory.”

STEP 03

Share the answer

Vurl shows the exact sentence it found and creates a permanent link to the result.

Try a real example

Choose one to place its source and claim in the checker. You can review them before submitting.

The principle

Evidence first.
Verdict second.

A label is convenient. A quotation is checkable. Vurl always shows you the quotation.
03 / FOR AGENTS

Call it before
you cite it.

Give every generated citation a preflight check. Vurl returns the evidence your readers can inspect — and a link that still works later.

Read the API Service status
Response POST /api/v1/validate
{
  "relation": "supports",
  "evidence": [{
    "quote": "…the exact words on the page…",
    "char_start": 2953,
    "char_end": 3030
  }],
  "freeze": {
    "text_sha256": "b74472ae39c227ee…",
    "frozen_at": "2026-08-27T17:48:51Z"
  },
  "url": "https://example.com/v/YOUR_PASSPORT_ID"
}

Pages change. Links die. Evidence shouldn't.

Check a claim Check several citations Shorten a URL