CiteCheck
CiteCheck is built on LawDiver's stored corpus — more than 10 million U.S. court opinions, 43,000 U.S. Code sections, the Code of Federal Regulations, over 1.5 million state statutes, federal and state court rules, U.S. and state constitutions, and specialty corpora (IRS tax authorities and SEC releases) — all cross-indexed for good-law determinations. With close to 100 million relationships between authorities, we know what is still good law and what is not. Free during rollout. For a step-by-step walkthrough, read how to cite-check a brief.
Can other cite checkers make that claim? Only the expensive ones from Westlaw and Lexis can. No one else has done the heavy lifting to recreate a first-class legal database — fully cross-indexed — so cite checking and legal research can rest on certainty rather than a language model's guess.
Cite-checking is a database problem. Asking the same class of model that drafted the brief whether a case is real is how fabricated cites survive review. CiteCheck resolves cites against opinions, statutes, regulations, rules, and specialty authorities that actually exist in the corpus and flags what it cannot confirm. The database index lists those holdings by year, and which authorities are stored for search versus retrieved from the official source.
If you are looking for where to cite-check a brief without a Westlaw or Lexis seat, CiteCheck is the LawDiver answer: a browser tool that extracts citations from PDF or Word filings and resolves each one against the live corpus. It is built for cite-checking legal work before filing — especially drafts that an AI assistant helped write.
Sign up with email and password. CiteCheck is free during the current rollout.
Drop a PDF or Word document. CiteCheck extracts every citation it can find — cases, statutes, regulations, rules, and specialty administrative forms.
Each cite shows resolution status and treatment signals drawn from the cross-indexed corpus. Quotations are checked against the opinion and highlighted there. A possible match is flagged for you to confirm. Open the opinion or statute when you need to read the passage.
Download findings and source materials so you can show what was checked before filing.
Does this citation resolve to a real opinion in the LawDiver corpus (10 million+ federal and state decisions)? Unresolved cites are flagged, not silently passed.
U.S. Code (43,000 current sections), the Code of Federal Regulations, and over 1.5 million state statutes — verified against held mirrors and official sources.
Federal and state court rules of procedure and evidence, plus U.S. and state constitutional provisions.
IRS tax authorities (Rev. Rul., PLR, and related forms) and SEC releases. Same resolve path as the API — no second tool.
Overruled, vacated, questioned, distinguished, subsequent history, and reversal flags — powered by close to 100 million stored relationships between authorities — so a real but undermined cite is not treated as safe.
Whole-brief checking for legal work product — not one cite at a time pasted into a search box. Need the same stack in your app? Use the LawDiver API cite-check endpoints.
CiteCheck verifies citations against LawDiver's held U.S. corpora — cases, federal and state statutes, the C.F.R., court rules, constitutions, and specialty administrative authorities. It is not a claim of feature parity with every Shepard's or KeyCite editorial signal, and it is not legal advice. Always read the authority for the proposition you cite. EPA/EAB, USPTO PTAB/TTAB/BPAI, and ITC § 337 specialty authority tables are searchable on LawDiver but are not yet on the cite-check resolve path. For free case search without uploading a brief, use LawDiver search or Caselaw. For programmatic cite-check, see the LawDiver API.
Related reading: How to cite-check a brief, free cite checking software, and why LLM cite checkers fail.
CiteCheck on LawDiver. Create a free account during rollout, upload a PDF or Word brief, and every citation is checked against more than 10 million U.S. court opinions, 43,000 U.S. Code sections, the Code of Federal Regulations, over 1.5 million state statutes, federal and state court rules, U.S. and state constitutions, and specialty corpora (IRS tax authorities and SEC releases) — with an audit trail of what resolved and what did not.
LawDiver's GoodLaw system is an AI- and human-powered proprietary citator. It uses EyeDiver citation identification to analyze whether a case is still good law, or has been overruled, vacated, vacated and reversed, or criticized, in full or in part. Longstanding commercial citators remain widely used and respected. Independent academic research on traditional digest and citator systems — including Susan Nevelow Mart, "The Case for Curation: The Relevance of Digest and Citator Results in Westlaw and Lexis" (2013), https://scholar.law.colorado.edu/cgi/viewcontent.cgi?article=1108&context=faculty-articles — has long documented that results can vary across tools. With careful AI plus human oversight, we believe competitive accuracy is achievable. GoodLaw is LawDiver's own approach; it is not a claim of superiority over any particular vendor.
Yes. CiteCheck is free during the current rollout. It is cite-checking software for briefs and legal work product: extract cites, resolve them against a first-class legal database — more than 10 million U.S. court opinions, 43,000 U.S. Code sections, the Code of Federal Regulations, over 1.5 million state statutes, federal and state court rules, U.S. and state constitutions, and specialty corpora (IRS tax authorities and SEC releases), all cross-indexed — check quotations against the cited opinion, and flag fabricated, possible, or undermined authority. Not a second LLM pass that invents confidence.
Cases, U.S. Code, the C.F.R., over 1.5 million state statutes, federal and state court rules, constitutions, and specialty administrative authorities: IRS tax authorities (Rev. Rul., PLR, and related forms) and SEC releases. EPA/EAB, USPTO PTAB/TTAB/BPAI, and ITC § 337 specialty authority tables are not on the cite-check path yet.
Upload the brief to CiteCheck, review each citation result (exists, treatment signals, unresolved), open the underlying opinions where needed, and fix anything flagged before you file. For a step-by-step walkthrough, see the how-to guide on the LawDiver blog.
Yes. That is a primary use case. Courts have sanctioned filings with citations to cases that do not exist. CiteCheck flags any cite that cannot be resolved to a real authority in the corpus rather than silently passing it.
Yes. CiteCheck and LawDiver GoodLaw sit on a cross-indexed corpus with close to 100 million relationships between authorities. Treatment signals — overruled, vacated, vacated and reversed, questioned, distinguished, including those outcomes in part — plus subsequent history mean an authority that exists but has been undermined is not mistaken for a safe cite.
Only the expensive citators from Westlaw and Lexis can. Building a first-class legal database — tens of millions of opinions and statutes, fully cross-indexed for good-law determinations — is the heavy lifting most “AI cite checkers” skip. CiteCheck runs on that stored, indexed corpus, not on another language model’s guess.
During the initial rollout, CiteCheck is free. Create a LawDiver account with your email and a password to start checking citations at no charge.
CiteCheck is a cheap Westlaw alternative and a cheap Lexis alternative for citation checking: it verifies citations against LawDiver's own corpus and reports whether an authority is still good law. It is free during the current rollout. It is not a copy of KeyCite or Shepard's, and it does not include the secondary materials those subscriptions bundle.
Westlaw and Lexis charge far higher fees for these services, so some of you ask what the catch is. There is no catch. Westlaw and Lexis were created when their work had to be done by hand or by complex legacy computer systems. Current technology has so leapfrogged the past that a tiny team can now do the work of hundreds, compared to even 10 years ago. We can charge so much less because our costs are so much less.