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Legal · Harvey AI
Domain-specific AI for legal and professional services.
Harvey is an AI platform built for law firms and corporate legal teams to research, analyze documents, and draft. It pairs an assistant and a secure document vault with purpose-built agents that execute complex legal work end to end. Sold through enterprise contracts rather than self-serve.
Model support
Built on frontier foundation models from multiple labs, tuned for legal work.
Where it runs
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Related in Legal
Thomson Reuters
AI legal assistant grounded in Thomson Reuters content.
CoCounsel is an AI assistant for lawyers and tax professionals that handles legal research, contract analysis, due diligence, and drafting. Built from the Casetext acquisition, it grounds answers in trusted Thomson Reuters sources like Westlaw and Practical Law and integrates with Microsoft 365. Pricing ranges from per-task to enterprise seats.
AI insight: Originated as Casetext, acquired by Thomson Reuters in 2023, and now wired into Westlaw, Practical Law, and Microsoft 365, not standalone.
LegalOn Technologies
Attorney-built AI for contract review and redlining in Word.
LegalOn is an AI contract review platform that detects risk and inserts redlines directly inside Microsoft Word. It ships 50+ attorney-built playbooks for common contract types so teams get guidance grounded in legal expertise, not just a general model. Founded in 2017 in Japan and used by thousands of legal teams.
AI insight: Pairs its AI with 50+ playbooks written by staff attorneys, leaning on curated legal guidance rather than a raw model to redline contracts.
Legora
Collaborative legal AI for research, review, and drafting.
Legora is a legal AI workspace for law firms and in-house teams that handles multi-document review, legal research, and drafting across complex matters. Formerly known as Leya, it is built largely on Anthropic's Claude. Sold to enterprise legal teams on per-seat annual contracts.
AI insight: Renamed from Leya, the Stockholm startup builds primarily on Anthropic's Claude and reached a $5.6B valuation as Harvey's main challenger.
LexisNexis
Generative AI legal research and drafting from LexisNexis.
Lexis+ AI, now branded Lexis+ with Protégé, is LexisNexis's generative AI assistant for conversational legal research, document drafting, and analysis grounded in its primary-law and secondary-source collections. It uses Shepard's citation verification to flag unsupported citations and includes a secure document vault for large matters.
AI insight: Rebranded to Lexis+ with Protégé in early 2026, adding Shepard's citation verification to check that AI-generated citations actually exist.
Luminance
Legal-Grade AI for contract review, negotiation, and management.
Luminance is an AI platform that automates contract review, negotiation, and management across an organization. Its agents read and analyze documents, redline against playbooks, and surface risk for legal, compliance, and procurement teams. Sold as an enterprise platform with per-user, volume-based pricing.
AI insight: Markets its models as "Legal-Grade" AI built by its own scientists, not a wrapper on one foundation model, and partnered with LexisNexis.
Rally Legal (Spellbook)
AI contract drafting and review, inside Microsoft Word.
Spellbook is an AI assistant for transactional lawyers that drafts, redlines, and reviews contracts directly inside Microsoft Word. It benchmarks clauses, runs playbook-based review across documents, and suggests language. Launched in 2022 as one of the first generative-AI tools for legal work.
AI insight: Runs entirely as a Microsoft Word add-in, so contract drafting and redlining happen in the document lawyers already work in, not a web app.