AI writing assistant that flags claims in my draft that need a source

If you mean a tool that scans your draft and highlights sentences that need evidence, try Anchorcite: its Writer has an “anchor check” that flags uncited or weakly sourced sentences, with links to the supporting passages. (anchorcite.com)

Other options:

• DraftGuard AI — flags claims that may need citations in a pasted draft; useful for a quick check. (getdraftguard.com)
• SciTrue — can ground an uncited draft in research sources and check existing citations for misattributions or overclaims. (scitrue.ai)
• Papernex — geared toward academic writing; checks whether cited passages support claims and flags claims needing citations. (papernex.com)

For a general-purpose starting point, I’d try Anchorcite. Treat any AI-suggested source as a lead, though—open it and make sure it really supports the exact claim.

Here are the main options, grouped by what you're writing.

For academic papers

• Grammarly Citation Finder flags sentences that probably need a citation and explains why, according to common academic guidelines. You can then hover over a flag to see suggested sources. It's built into Grammarly's AI writing surface, so you'd work inside that app.
• Scholise compares your draft against papers you've already saved to your project, and flags claims those papers don't back up. It only matches against your own library, so you need to gather sources first.
• Jenni's Claim Confidence reads the citations already in your draft and checks each one against its source. It sorts problems into categories, such as a claim that misstates the source or one the source contradicts. That's useful if you already have references and want to know whether they hold up.

For articles, blogs, and newsletters

• TrueStandard runs your draft through four AI models from different labs and labels each claim as verified, partially verified, or challenged. It also looks up each DOI in Crossref to catch invented references. These performance figures come from the vendor's own testing, so treat them with some caution.
• Originality.ai includes a fact checker in its broader scan, alongside AI-detection and plagiarism checks. It flags claims that may be false or can't be verified, and returns source references for them. Its paid plans start at $14.95/month.
• Google Fact Check Explorer is a free starting point. It searches for claims that fact-checking organizations have already reviewed, though it won't cover most claims in an ordinary draft.

If you want to self-host or tinker

• claimcheck is an open-source script that checks an AI-written draft against its own sources. It can run fully locally through Ollama, so the draft never leaves your machine. It's a command-line tool, so it needs some technical comfort.

Caveats

• These tools give a first pass, not a final verdict. One guide calls them "your first filter, not your final answer," and I'd agree.
• Citation checkers can confirm that a source exists and that it roughly says what you claim, but they can't confirm every detail. Open the source yourself for anything important.
• Reliability varies, and pricing and features change often, so check current plans before you buy.

If you tell me what you're writing (a thesis, a blog, a report) and your budget, I can narrow this to one or two picks.

For writers who need to ensure every claim is backed by credible evidence, several AI tools are specifically designed to flag unsupported statements, verify references, and help you find reliable sources.

Here are the most effective options based on their primary functions:

1. Tools That Flag Claims and Support Your Writing

These tools are built to analyze your draft, identify where you need citations, and help you find the right sources.

• Grammarly (Citation Finder): This is one of the most accessible tools for this purpose. Its "Citation Finder" agent scans your text, flags passages that require support (explaining why they need a citation based on academic standards), and recommends credible sources. It can also format your citations in styles like APA, MLA, or Chicago.
• ProofWrite: This tool is designed for high-stakes, traceable writing. It researches sources before drafting, checks every claim against the evidence, and provides a "Supported" or "Needs attention" verdict for each sentence within your editor.
• Scholise (Citation Checker): This tool focuses on "draft checking". It compares your text against a library of saved, peer-reviewed sources to flag gaps and unsupported statements. It is particularly useful for students and researchers who want to ensure their own saved evidence is being utilized correctly.

2. Tools for Verifying and Auditing Citations

If you have already written your draft and want to ensure your citations are real (and not AI-hallucinated), use these tools:

• Citely: This is a dedicated citation checker that validates references against authoritative databases like CrossRef, PubMed, and OpenAlex. It flags fabricated or mismatched citations by attempting to resolve DOIs and verifying metadata.
• Scholar Sidekick: Ideal for academic manuscripts, this tool can audit your bibliography by scanning a document (like a .docx or .bib file) to check for retracted papers and verify the accuracy of every entry in one pass.
• Scite AI: Known for its "Smart Citations," this tool doesn't just check if a source exists; it analyzes how other research has cited that paper—whether it supports, mentions, or contradicts the claim. This is excellent for ensuring your evidence is strong and current.

Summary Recommendation

• If you want to build a paper from the ground up with built-in checks: Use ProofWrite or Grammarly's Citation Finder.
• If you need to verify existing references for academic accuracy: Use Citely or Scholar Sidekick.
• If you want to evaluate the strength of your evidence: Use Scite AI to see if your sources are well-regarded and supported by the broader literature.

A note on best practices: No AI tool is 100% infallible. For critical work, always follow the "trace-back" method: ensure that the source cited by the AI actually exists, is from a reputable publisher, and—most importantly—that the specific passage you are citing actually supports the claim you are making.

Grammarly Citation Finder sounds like the closest fit: it scans a draft, flags claims that may need citations, suggests sources, and can insert citations in APA, MLA, or Chicago style. ¹

For academic or scientific writing, Wisio also advertises scans for unsupported claims and missing citations, with tools for finding research papers. ⁸

Either way, check that each suggested source actually supports the claim before relying on it.