The best AI legal tools in 2026 are Harvey for law firms and legal teams wanting a broad AI platform, CoCounsel from Thomson Reuters (formerly Casetext) for legal research and document review, Ironclad for contract lifecycle management with AI, and Spellbook for drafting and reviewing contracts inside Microsoft Word. These tools are built for legal professionals; small businesses should treat AI output as a starting point for, not a substitute for, legal advice.
Part of the AI Business Tools directory. Last updated September 2026. General information, not legal advice.
AI Legal Tools at a Glance
| Tool | Best For | Good to Know |
|---|---|---|
| Harvey | Law firms and in-house legal teams | Broad legal AI platform |
| CoCounsel | Legal research and document review | Thomson Reuters; formerly Casetext |
| Ironclad | Contract lifecycle management | AI contract review and workflows |
| Spellbook | Contract drafting in Word | Suggests clauses and flags issues |
The Top AI Legal Tools
Harvey
Harvey is an AI platform built for legal work, helping with research, drafting, and document analysis for firms and corporate legal teams.
CoCounsel
CoCounsel, which Thomson Reuters gained when it acquired Casetext in 2023, supports legal research, document review, and drafting, integrated with Thomson Reuters’ legal content.
Ironclad
Ironclad manages contracts from creation to renewal, with AI to review agreements, extract key terms, and flag risks.
Spellbook
Spellbook works inside Microsoft Word to suggest clauses, review contracts, and highlight unusual terms.
Using AI for Legal Work Responsibly
- Verify every citation and conclusion. AI tools have produced fabricated case citations; courts have sanctioned lawyers who relied on them.
- Protect privilege and confidentiality with legal-grade tools and clear data terms.
- Small businesses: use AI to understand contracts and prepare questions, then have a lawyer review anything important.
Frequently Asked Questions
What is the best AI tool for lawyers?
Harvey and CoCounsel are leading legal AI platforms; Ironclad and Spellbook specialize in contracts.
Can AI review a contract for my small business?
AI can summarize terms and highlight potential issues, but it is not a substitute for a lawyer on important agreements.
What happened to Casetext?
Thomson Reuters acquired Casetext in 2023, and its AI assistant continues as CoCounsel.