Best AI Tools for Lawyers: Legal AI That Actually Works
Harvey AI, Casetext, and Westlaw AI are transforming legal practice. Here's an honest assessment of which legal AI tools are worth using — and which to avoid.
Dr. Amara Diallo
Specialist Editor — AI for Healthcare & Legal
Medical doctor turned health technology consultant. Amara brings clinical expertise to our reviews of AI tools for healthcare professionals, medical documentation, and legal AI. She works with law firms and NHS trusts to evaluate AI adoption.
Affiliate disclosure: Some links on this page lead to our tool review pages, where you can find affiliate links. We may earn a commission at no extra cost to you. Our editorial opinions are independent and unbiased.
What We Tested / Our Methodology
Understanding Legal AI: Categories and Use Cases
General-Purpose AI (LLMs) vs. Legal-Native AI
General-Purpose AI (LLMs) like ChatGPT are trained on vast general text data, excelling at writing, summarization, and brainstorming. They are often used for initial drafts and internal productivity. [2]
Legal-Native AI Platforms are purpose-built for the legal industry, trained on curated legal data to ensure accuracy, citable results, and compliance. They prioritize enterprise-grade security and offer integrated access to legal research ecosystems like Westlaw and Lexis, providing verified legal data and specialized functionalities. [2]
Key Legal AI Categories
Within the legal AI ecosystem, several distinct categories address specific needs:
Legal Research AI tools revolutionize how lawyers find case law, statutes, regulations, and secondary sources. They offer conversational search, case summaries, and often include citation validation, significantly reducing research time. Examples: Westlaw AI/CoCounsel and Lexis+ AI. [1] [2]
Contract Review & Drafting AI tools streamline transactional work, excelling at clause extraction, risk flagging, redlining, and generating legal text. Key players: Spellbook, Superlegal, Diligen, and Harvey AI. [1] [2]
Litigation Support & Analytics AI platforms assist litigators by organizing discovery, building timelines, analyzing motion outcomes, and predicting judicial rulings. A notable tool is Darrow. [1] [3]
Practice Management AI integrates AI into practice management systems to automate administrative tasks, improve operational efficiency, and enhance client communication. A leading example is Clio. [1] [2]
In-Depth Review of Leading Legal AI Tools
Spellbook
Spellbook is a leading AI tool for transactional lawyers, designed for efficient contract drafting, review, and analysis. Its seamless Microsoft Word integration streamlines workflows, reduces cognitive load, and empowers lawyers to customize clauses, automate redlining, and benchmark contracts. [1]
Pros: Native Microsoft Word integration, significant time savings, legal-specific functionalities, easy implementation, affordable for solo/small firms, free trial. [1]
Cons: Limited scope (no post-signature management or predictive analytics), transactional law focus. [1]
Best For / Who Should Use This: Transactional lawyers, corporate law practices, and legal professionals heavily involved in contract drafting and review seeking Word integration for efficiency. [1]
Lexis+ AI
Lexis+ AI integrates advanced AI into the LexisNexis platform, transforming legal research with conversational search for precise, cited answers. It provides robust case summaries, Shepard’s validation, and drafting assistance, leveraging LexisNexis’s vast, authoritative legal database for high accuracy. [1] [2]
Pros: Market-leading legal research, high accuracy with cited sources, integrated research/analytics/drafting tools, critical citation analysis. [1] [2]
Cons: Costly for smaller firms, steep learning curve for advanced features, comprehensive features often bundled. [1]
Best For / Who Should Use This: Law firms prioritizing advanced legal research, comprehensive case analysis, and high-stakes litigation where accuracy and authoritative sources are paramount. [1] [2]
Thomson Reuters CoCounsel
Thomson Reuters CoCounsel is an AI-powered research assistant integrated with Westlaw. It excels at answering legal questions, summarizing complex case law, and drafting research memos with inline citations directly from Westlaw’s vast database, accelerating research and providing accurate, verifiable results. [1] [2]
Pros: Leverages authoritative Westlaw database, accurate inline citations, efficient summarization, document comparison, case timeline features. [1] [2]
Best For / Who Should Use This: Law firms and legal departments relying on Westlaw, needing an AI assistant for advanced legal research, memo drafting, and case analysis, particularly for litigators and researchers. [1] [2]
Harvey AI
Harvey AI is a sophisticated AI platform for large law firms and corporate legal departments, focusing on complex legal research, drafting, and contract analysis. It excels at summarizing extensive legal documents, conducting in-depth legal database research, and providing nuanced answers to intricate legal queries, offering high accuracy and reliability for demanding legal tasks. [1] [2]
Pros: Enterprise-grade solution, high accuracy for complex tasks, scalable for large teams, leverages vast legal databases, excels in contract analysis. [1] [2]
Best For / Who Should Use This: Large law firms, corporate legal departments, and in-house legal teams requiring powerful, scalable AI for complex legal research, drafting, and contract analysis. [1] [2]
Darrow
Darrow is a unique legal intelligence solution focusing on proactive case origination and litigation analytics. It empowers legal professionals to discover potential legal risks, assess claim value, and build cases faster by sifting publicly available data using proprietary AI and anomaly detection. [3]
Pros: Proactive case origination, identifies emerging legal risks, strong evidentiary support, predictive underwriting, unique plaintiff services, specialized for plaintiff-side litigation. [3]
Best For / Who Should Use This: Plaintiff attorneys, law firms specializing in class action/mass tort lawsuits, and legal teams focused on identifying and pursuing new litigation opportunities. [3]
Clio
Clio is a comprehensive cloud-based legal practice management software with integrated AI functionalities to enhance firm operations. Its AI features automate administrative tasks, improve efficiency in billing and time tracking, and provide matter summaries, centralizing firm data for robust case, client, and financial management. [1] [2]
Pros: All-in-one practice management, automates administrative tasks, centralizes firm data, user-friendly, scalable. [1] [2]
Best For / Who Should Use This: Law firms of all sizes seeking comprehensive practice management with integrated AI to centralize operations, automate tasks, and improve efficiency. [1] [2]
Superlegal
Diligen
Diligen is an AI-powered contract analysis platform designed to accelerate due diligence review. It excels at clause extraction, contract analysis, and risk flagging, making it invaluable for M&A and transactions involving large contract volumes. [1]
Pros: Highly effective for M&A/real estate/extensive contract review, automates clause extraction/risk identification, scalable for large contract volumes, accurately flags risks. [1]
Best For / Who Should Use This: Law firms, corporate legal departments, and M&A teams regularly conducting extensive due diligence with large contract volumes. [1]
ChatGPT
ChatGPT is a general-purpose AI, widely adopted by lawyers due to its accessibility and versatility. It excels at drafting first-pass legal letters, summarizing content, rephrasing boilerplate clauses, and brainstorming. [1] [2]
Pros: Highly accessible (free version), versatile for general tasks, user-friendly, extensive community support. [1] [2]
Cons: High risk of hallucinations, no native citation verification, data confidentiality concerns, not legal-specific. [1]
Best For / Who Should Use This: Lawyers seeking a general AI assistant for brainstorming, initial drafting of non-client-specific documents, summarizing public information, and internal productivity. Outputs must always be meticulously reviewed and verified. [1] [2]
Choosing the Right AI Tool for Your Practice
Selecting the optimal AI tool requires thoughtful assessment of your specific needs, workflows, and strategic objectives. Consider these factors:
Practice Area and Specialization: AI tools cater to different legal domains. Transactional lawyers benefit from Spellbook and Diligen; litigators may prefer Lexis+ AI, CoCounsel, or Darrow. Align functionality with primary practice areas.
Security and Compliance Requirements: Prioritize tools with robust data security, zero-retention policies, and compliance certifications (e.g., SOC 2). Always verify data handling.
Integration with Existing Systems: Seamless integration with current practice management software, document management systems, and word processors is crucial for smooth adoption.
Ease of Use and Training: Intuitive interfaces and minimal learning curves are vital. Consider vendor support and training resources.
Scalability: Ensure the AI tool can scale with your practice's growth or evolving needs.