Westlaw vs Harvey
Side-by-side comparison of AI visibility scores, market position, and capabilities
Thomson Reuters (NYSE: TRI) Westlaw legal research platform with CoCounsel AI ($650M Casetext acquisition); KeyCite citation analysis competing with LexisNexis and Harvey.ai for attorney AI legal research market leadership.
About
Westlaw is a legal research platform owned by Thomson Reuters (NYSE: TRI) — a Toronto, Canada-based information and professional services company generating $6.8+ billion in annual revenue across legal, financial, and risk intelligence segments — providing attorneys, judges, law students, and legal researchers with the most comprehensive legal research database in the US and internationally, offering access to case law dating to the 1800s, statutes, regulations, administrative law, secondary sources (law review articles, practice guides, treatises), and the KeyCite citation analysis tool that verifies whether a legal precedent remains good law and identifies all citing references. Westlaw is one of the two dominant legal research platforms globally (alongside LexisNexis) with the subscription legal research market generating $5B+ annually from law firms, corporate legal departments, courts, and law schools.
$150M raise at $8B valuation (Q1 2026); dominant legal AI platform. Used by 200+ top law firms and legal departments at Fortune 500. Harvey handles contract review, due diligence, legal research, and brief drafting.
About
Harvey is a San Francisco-based generative AI platform purpose-built for legal professionals — providing law firms, corporate legal departments, and legal service providers with AI-powered legal research, contract analysis, document drafting, and regulatory analysis tools trained on legal corpora and aligned with legal professional standards. Founded in 2022 by Gabriel Pereyra and Winston Weinberg (formerly of OpenAI and Goldman Sachs) and backed with $300+ million raised including participation from OpenAI Startup Fund, Sequoia Capital, and Google Ventures at a $1.5 billion valuation in 2024, Harvey serves over 100 major law firms including Allen & Overy (A&O Shearman) and PricewaterhouseCoopers Legal.
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