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Blog· LegiMatch vs Westlaw, Lexis, Bloomberg Law, vLex, Harvey, Paxton and BriefCatch - compared on tested numbers
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LegiMatch vs Westlaw, Lexis, Bloomberg Law, vLex, Harvey, Paxton and BriefCatch - compared on tested numbers

By LegiMatch Research Team · Published October 21, 2026 · 7 min read

Short answer: Westlaw and Lexis are the industry's research platforms, with the standard citators (KeyCite and Shepard's), brief checkers (Quick Check and Brief Analysis) and Word add-ins. LegiMatch covers the same daily work - checking a brief and finding cases - in one plan with a public price ($99 a month, or $149 per user), a 14-day trial with only an email, and something neither publishes: measured accuracy. In 21 blind test rounds on 1,635 real documents, LegiMatch caught 98.6% of planted case-citation mistakes in its latest rounds and called none of 5,185 real citations nonexistent; its similar-case search found the exact original decision in the top 10 in 85% of a published 80-case test.

Disclosure: we make LegiMatch. Westlaw and Lexis facts are from their own pages, checked on 20 October 2026; product details change, so check them before you buy.

At a glance

Research platforms

WestlawLexisBloomberg LawvLex Vincent AIHarveyLegiMatch
Checks a brief's citations and quotationsYes - Quick CheckYes - Brief Analysis (Quote Check, Shepard's)Yes - Brief AnalyzerFinds related authority for an uploaded brief; no cite-check report describedAnnounced on its roadmap (Sept 2026)Yes - caught 98.6% of planted case-citation mistakes; 0 of 5,185 real citations called fake
Checks pin citesNot described on its Quick Check pageYes ("whether the pin cites provided are correct")Not described on its pagesNot described on its pagesNot described on its pagesYes - caught 190 of 190 planted wrong pin pages
Later treatment of a caseKeyCiteShepard'sBCiteVincent treatment signalsShepard's, through a LexisNexis partnershipNegative-treatment warnings from our citation graph
Suggests cases the brief didn't citeYesYesYesYesNot described on its pagesYes - "Cases you may have missed"
Checks that a statute section fits the sentence it supportsNot described on its pagesNot described on its pagesNot described on its pagesNot described on its pagesNot described on its pagesYes - caught 31 of 35 swapped sections
Finds cases from a description of the factsClaims Explorer (facts to claims)Fact & Issue Finder (6 practice areas)Not described on its pagesNot described on its pagesYes (fact patterns against precedent)Yes, any practice area - exact original in the top 10 in 68 of 80 tests (85%)
Finds the case a quotation comes fromFull-text searchFull-text searchFull-text searchFull-text searchNot described on its pagesYes - 39 of 40 real quotations, under a second
Works inside Microsoft WordCoCounsel for WordLexis Create+Upload from WordvLex for WordHarvey for WordLegiMatch Word add-in
Published accuracy for citation checking, with methodNoneNoneNoneNoneNone (a 2024 hallucination figure for its own drafting benchmark)Yes - blind tests, method published
Trial7 days, no card; phone and address required2 daysDemo requestFree trial offered (terms not stated)Demo request14 days, email only, no card, no sales call
Public priceFrom $256.75/monthContact salesContact salesContact salesContact sales$99/month (Solo), $149/user/month

AI research tools and free sources

PaxtonBriefCatchGoogle ScholarCourtListenerLegiMatch
Checks a brief's citations and quotationsNot described on its pagesYes - RealityCheck (cases and federal statutes exist; quotes match)Not described on its pagesChecks that citations exist (API); quotations not checkedYes - caught 98.6% of planted mistakes; 0 of 5,185 real citations called fake
Checks pin citesNot described on its pagesYesNot described on its pagesNot described on its pagesYes - 190 of 190 planted wrong pin pages
Later treatment of a caseAI citatorNot described on its pages"How cited" listCited-by listNegative-treatment warnings
Suggests cases the brief didn't citeNot described on its pagesNot described on its pagesNot described on its pagesNot described on its pagesYes
Checks that a statute section fits the sentenceNot described on its pagesChecks the statute existsNot described on its pagesNot described on its pagesYes - 31 of 35 swapped sections
Finds cases from a description of the factsResearches against your matter's factsNot described on its pagesNot described on its pagesNot described on its pagesYes - 85% in our 80-case test
Finds the case a quotation comes fromNot described on its pagesNot described on its pagesPhrase searchPhrase searchYes - 39 of 40 real quotations
Works inside Microsoft WordLists Word among connected toolsYes - Word add-inNoNoYes - Word add-in
Published accuracy for citation checkingNone (publishes research and citator benchmarks)NoneNoneNoneYes - blind tests, method published
Trial7 days7 days, no cardFreeFree14 days, email only
Public price$499/user/monthFrom $60/seat/month (annual)FreeFree (nonprofit)$99/month, $149/user/month

Facts about other products are from their official pages, checked 20 October 2026; "Not described on its pages" means we found no description of the feature, not that it cannot exist. Products change - check before you buy.

What each has measured and published

None of Westlaw, Lexis, Bloomberg Law or vLex publishes an accuracy rate for its brief checker or its fact-based case search. The best-known independent study, by Stanford's RegLab (published 2024, journal version 2025), found that AI legal research tools from both vendors gave incorrect or misgrounded answers in roughly 17% to 33% of its test questions; it tested research answers from 2024 versions, not citation checking, so it says little about today's brief checkers.

LegiMatch publishes its own tests and how they were run, so anyone can repeat them:

TestResult
Planted case-citation mistakes caught (latest 2 rounds, 200 court decisions)1,397 of 1,417 (98.6%)
Real citations wrongly called nonexistent (same rounds)0 of 5,185
All 21 blind rounds, before and after fixes10,444 of 10,741 (97.2%); 11 of 43,046 real citations called nonexistent
Statute changed to another real section (AI check on)31 of 35
Statute changed to a section that doesn't exist18 of 19
Similar-case search: exact original in top 10 (80 rewritten decisions)68 of 80 (85%)
Source of real quotations found39 of 40

Details: our accuracy report and the similar-case test.

Where each is stronger

Westlaw, Lexis and Bloomberg Law

  • The standard citators. KeyCite and Shepard's are what courts and firms rely on for later treatment.
  • Mature workflows for large firms, with enterprise support.

LegiMatch

  • Measured and published accuracy, re-tested on new documents.
  • A statute-meaning check: a real section cited for the wrong point (§ 2612 where § 2615 was meant) is flagged, with the nearby section that fits.
  • One plan, public price: brief checking, similar-case search, quotation search and the Word add-in together.
  • An easy trial: 14 days with an email - no phone, address, card or sales call.

How to choose

  • You need a full editorial citator and firm-wide enterprise tools: Westlaw or Lexis.
  • You want to check briefs and find cases with a known accuracy, at a published price: try LegiMatch for 14 days.
  • Many lawyers use both: a research platform for depth, and a fast checker before filing.

Frequently asked questions

Does LegiMatch replace Westlaw or Lexis?

For checking briefs and finding cases from facts, many small firms use it on its own. For a full editorial citator, Westlaw and Lexis go further.

Why don't Westlaw and Lexis publish accuracy numbers?

We don't know; neither does. Ask any vendor for its method and numbers before you buy, and run the same test on a brief you know well.

Do these tools replace reading the cases?

No. They catch wrong and fake citations and misquotations; whether a case supports your argument still needs a lawyer's reading.

Sources

This article is general information about legal research, not legal advice. Verify every authority before relying on it.

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