Paste five claims. See which ones have no source.
The expensive nonfiction problems are usually not bad sentences. They are claims that arrived without a source and stayed. This free check reads up to five claims and gives you a source-gap report: which claims name no source, which numbers and causal claims are unsupported, and what to attach next. It uses deterministic rules, not a model — the same approach the suite uses to surface coverage gaps.
Your claims stay in your browser. Nothing is uploaded, stored, or sent to a model.
The five-claim check
Tip: Ctrl/Cmd + Enter runs the check. A claim can be a sentence, a bullet, or a line from your draft.
Paste up to five claims, one per line, then run the check.
What this check finds
It flags
- A claim with no source attached
- A number with no source
- A causal claim with no evidence for the link
- A comparison with no source for either side
- Absolute wording (“all,” “never,” “proves”)
- An attribution with no named source
It does not do
- Verify that a source is true or current
- Check that a quote is accurate
- Decide whether a claim is safe to publish
- Invent a source, a citation, or a statistic
- Replace an editor or a fact-checker
The report is a prompt for the next action, not a verdict. A claim marked “has an inline citation” still needs a human to confirm the source supports the claim as worded.
How to read the three statuses
Needs a source
No inline citation was detected. Attach the source before the claim goes to an editor.
Check the support
A citation is present, but the wording (a number, a cause, a universal) usually claims more than one source can carry. Confirm the source actually supports the whole claim.
Has an inline citation
A source is attached and no overreach was detected. Still check that the source says what the claim says.
From five claims to the whole manuscript
The five-claim check shows the method. A book has hundreds of claims, and they change as the draft changes. The Claim Ledger keeps every claim with its source, its evidence status, and its manuscript anchor, then surfaces the whole-manuscript exceptions: claims with no source, anchors that no longer match the text, and cross-chapter contradictions. Nothing is certified; the review stays with you.
Common questions
Does this tool fact-check my claims?
No. It reports source gaps: whether a claim names a source, whether a number or causal claim is unsupported, and which wording overreaches. It does not verify that a source is true, current, or correctly quoted. Checking the source against the claim is still your job or your editor’s.
Is my text uploaded or stored?
No. The check runs in your browser with plain deterministic rules. Your claim text is not sent to a server, saved to an account, or used to train a model.
What happens after five claims?
This free tool checks five claims so you can see the method. The Claim Ledger in Nonfiction Suite keeps every claim in the manuscript with its sources, evidence status, and manuscript anchor, and re-checks the whole set as the draft changes.