The AI tools law firms actually use
This list covers the tools that come up most often in legal AI conversations in 2026: CoCounsel, Lexis+ AI, Harvey, Spellbook, and Clio's AI features. Editorial coverage only, no fabricated rankings and no invented pricing.
CoCounsel (Thomson Reuters)
An AI layer built on top of Westlaw. Thomson Reuters rebuilt the next generation of CoCounsel Legal on Anthropic's Claude Agent SDK, reaching general availability in August 2026. It plans research, drafts with citations, and pulls from Westlaw's authoritative legal content.
Pricing: Sold as a tiered add-on to an existing Westlaw subscription. Thomson Reuters does not publish a flat public rate; pricing runs through your account representative. Best for: firms already on Westlaw.
Lexis+ AI (Protege)
LexisNexis's answer to CoCounsel: an AI research and drafting assistant layered onto the Lexis+ research platform.
Pricing: Sold as an add-on to a base Lexis+ research subscription, negotiated with a sales representative. LexisNexis does not publish a fixed public rate. Best for: firms already on Lexis+.
Harvey
An enterprise AI platform for large law firms, positioned for legal research, drafting, and workflow automation at scale.
Pricing: Harvey does not publish a pricing page. It is sold through a direct enterprise sales process. Best for: BigLaw-tier firms with dedicated procurement and IT support for onboarding.
Spellbook
An AI add-in for Microsoft Word that reviews and drafts contract language directly inside the document a lawyer is already working in, without switching tools.
Pricing: Priced by team size after a demo. No fixed rate is published; a free trial is available. Best for: transactional and contract-heavy practices of any size.
Clio's AI Features
Clio, the practice management platform, has built AI features (drafting, scheduling, billing assistance) into its product line for firms already managing cases in Clio.
Pricing: Bundled into Clio's higher-tier plans rather than sold as a separate flat-rate product. Best for: firms already running their practice on Clio.
Do AI tools for law firms publish their pricing?
Mostly no, and that is worth saying plainly. Every tool above is either sold as an add-on to an existing subscription (CoCounsel, Lexis+ AI), bundled into a broader platform (Clio), or sold through a direct sales process with no public rate card (Harvey, Spellbook). None of them will tell you what you will pay until you talk to someone.
How does CenseoAI fit alongside these tools?
CenseoAI does not compete with Westlaw, Lexis, Harvey, or Spellbook. CenseoAI trains law firm teams to use Claude or ChatGPT safely and effectively on the accounts the firm already owns, and separately builds governed, custom AI systems for intake, follow-up, and client communication. CenseoAI publishes its own pricing, the Censeo Assessment at $1,500, pilots from $4,500, and full builds from $12,000, which none of the tools above do. See AI for law firms →
About the author
Scott Withers
owner of CenseoAI
MBA in Entrepreneurship and Small Business (LSU Shreveport, 2025), Cornell Sales Growth Certificate and Cornell Designing and Building AI Solutions Certificate. 30+ years across beverage/CPG, distribution, and trades operations. Active member of Traverse City Sunrise Rotary, Traverse Connect, and HBA of Northwest Michigan.
Frequently asked questions
What is the best AI tool for law firms?
It depends on what a firm already uses. Firms on Westlaw get CoCounsel Legal, now rebuilt on Claude. Firms on Lexis get Lexis+ AI with Protege. Firms wanting contract drafting inside Microsoft Word often use Spellbook. Firms wanting a full custom build work directly with a model like Claude or ChatGPT through a consultant or an internal team.
Do AI tools for law firms publish their pricing?
Mostly no. Harvey does not publish a pricing page and requires a sales conversation. Spellbook prices by team size after a demo. CoCounsel's full legal-research tier and Lexis+ AI with Protege are sold as add-ons to an existing Westlaw or Lexis subscription, priced through your account representative. Clio's AI features are bundled into its higher-tier plans.
What is Harvey, and who is it for?
Harvey is an AI platform built for large law firms, positioned for enterprise-scale legal research, drafting, and workflow automation. It does not publish pricing and is sold through a direct sales process, typically to BigLaw-tier firms with dedicated procurement and IT support for onboarding.
What is Spellbook, and who is it for?
Spellbook is an AI add-in for Microsoft Word that reviews and drafts contract language directly inside the document a lawyer is already working in. It is priced by team size after a demo, with no fixed published rate, and serves firms and in-house legal teams of any size.
How does CenseoAI fit alongside these AI tools for law firms?
CenseoAI does not compete with Westlaw, Lexis, Harvey, or Spellbook. CenseoAI trains law firm teams to use Claude or ChatGPT safely and effectively on the accounts the firm already owns, and separately builds governed, custom AI systems for intake, follow-up, and client communication. CenseoAI publishes its own pricing, which none of the tools above do.
Want a governed, custom-built system instead?
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