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What is Westlaw?

Westlaw is a comprehensive legal research and analytics platform developed by Thomson Reuters for attorneys, legal researchers, government agencies, and corporate legal departments. The platform provides searchable access to case law, statutes, regulations, administrative decisions, and secondary legal materials used in legal research and litigation preparation. Its search technology allows users to locate relevant authorities through natural language queries, Boolean searches, citations, and subject-based navigation. The West Key Number System organizes legal principles into a structured classification system that helps researchers identify related cases addressing specific legal issues. Attorney-written headnotes and editorial summaries provide additional context for evaluating court decisions and understanding their legal significance. KeyCite enables users to verify the validity of cases, statutes, and regulations while reviewing citing references, subsequent treatment, and potential overruling risks. Westlaw Edge includes AI-assisted research that generates synthesized answers grounded in Westlaw content and links users to supporting legal authorities. Quick Check analyzes uploaded briefs and other legal documents to identify potentially invalid citations, overlooked precedents, and authorities that may weaken an argument. Litigation Analytics provides data-driven insights into judges, courts, attorneys, law firms, case outcomes, and damages to support litigation strategy and case evaluation. Additional capabilities include AI Jurisdictional Surveys, Statutes Compare, Regulations Compare, and precision research tools for investigating legal issues across jurisdictions. Westlaw Advantage extends the platform with agentic AI capabilities, Deep Research, litigation document analysis, and research workflows designed to help legal professionals move from finding relevant authorities to developing legal strategies.

What is ArkLegal AI?

ArkLegal AI is a cloud-based platform for legal research, document analysis, and drafting, serving attorneys, law firms, legal teams, businesses, and self-represented individuals. The platform offers jurisdiction-aware research across all 50 states and federal courts, together with citation verification, source linking, document review, and legal drafting within matter workspaces. The Ark plan includes integrations with Microsoft Word, OneDrive, and Clio. Users can submit research questions, analyze uploaded documents, and generate drafts directly in their web browsers, and free research and document tools are also available. Founded on December 6, 2025 by attorney Philippe Revah, ArkLegal AI is operated by ARK LEGAL AI LLC, based in Hallandale Beach, Florida. ArkLegal AI is a software solution and not a law firm, so users should independently verify sources, current treatment, citations, and drafts before relying on them.

Media

Media

Integrations Supported

Deadline Assistant
OpenAdapt

Integrations Supported

Clio
Microsoft OneDrive
Microsoft Word

API Availability

API Availability

Pricing Information

$75 per month

Pricing Information

$39.99/user/month
The Ark plan: $89 every 30 days with $89 of usage credit included each period. Covers all 50 states and federal courts, AI legal research, case agents, matter workspaces with 25 GB storage, citation verification, DOCX export, and the Clio, Microsoft Word and OneDrive integrations. Law Database + AI Doc Synthesizer: $39.99 per user per month for full case-law reading plus OCR, extraction and PDF tools. Free account with 2 free queries. No contract; cancel any time.
Free Version

Supported Platforms

SaaS

Supported Platforms

SaaS

Customer Service / Support

Web-Based Support

Customer Service / Support

24 Hour Support
Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub

Company Facts

Organization Name

Thomson Reuters

Date Founded

2008

Company Location

Canada

Company Website

legal.thomsonreuters.com/en/westlaw

Company Facts

Organization Name

ArkLegal AI

Date Founded

2025

Company Location

United States

Company Website

arklegal.ai/

Categories and Features

Legal

Not specified

Legal Research

Not specified

Personal Injury Law

Not specified

Categories and Features

AI Legal

ArkLegal AI integrates various language models with a focus on citation-driven retrieval tailored for legal tasks in the U.S. It offers features such as research solutions, case management, collaborative workspaces with document upload capabilities, drafting options with DOCX export, and seamless integration with Clio, Microsoft Word, and OneDrive. Additionally, users can monitor the ongoing costs of each chat and case in real time.

Not specified

Legal Research

ArkLegal AI is designed to scour through case law, statutes, and regulations from all 50 states as well as federal courts. It provides users with responses that include source links and relevant excerpts. Additionally, its citation verification feature ensures that every referenced authority is valid, properly cited, and has not been marked as overruled or superseded, displaying the relevant court's excerpt alongside each citation flag.

Not specified

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