The Best AI Tools for Legal Writing: A Practical Guide for Lawyers
Legal writing is one of the most demanding parts of legal practice. Whether you are drafting contracts, briefs, memos, motions, or client emails, the work has to be accurate, clear, and efficient. Artificial intelligence is now helping legal professionals handle these tasks faster and with less friction.
The best AI tools for legal writing are not replacing lawyers. They are helping lawyers research faster, draft more efficiently, and polish documents with less manual effort. For firms and solo practitioners alike, the right tool can save time, improve consistency, and support better client service.
Why AI Tools Matter for Legal Writing
Legal writing often involves repetitive work, detailed review, and constant pressure to get every word right. Traditional workflows can be slow, especially when they involve manual research, citation checking, document review, and repeated revisions.
AI tools help by:
- speeding up legal research
- summarizing long documents
- generating first drafts
- checking grammar, tone, and readability
- identifying possible issues before final review
Used well, these tools can reduce time spent on routine tasks and free lawyers to focus on strategy, analysis, and advocacy.
Top AI Tools for Legal Writing
1. Lexis+ AI (LexisNexis)
What it does:
Lexis+ AI combines generative AI with the LexisNexis legal research platform. Users can ask questions in plain language and receive AI-generated summaries of relevant research, including citations. It can also help generate draft language for legal documents.
Why it is useful:
It streamlines legal research and helps users move quickly from a legal question to a usable draft. For lawyers already working in LexisNexis, it can make the research and drafting process more efficient.
Best for:
Lawyers, associates, and researchers who regularly use LexisNexis for case law, statutes, and secondary sources.
Pros:
- Integrated with a large legal research database
- Supports natural language queries
- Helps with both research and drafting
- Useful for starting memos, briefs, and client letters
Cons:
- Requires a LexisNexis subscription
- Outputs still need careful review
- May take time to learn if you are new to advanced platform features
2. Westlaw Edge AI Assistant (Thomson Reuters)
What it does:
Westlaw Edge AI Assistant brings generative AI into the Westlaw platform. It allows users to ask questions in plain English, summarize legal topics, and generate draft language for legal documents. It can also summarize lengthy materials.
Why it is useful:
It reduces the time needed to find relevant authority and understand complex legal issues. The summarization features are especially helpful when reviewing long opinions, filings, or research materials.
Best for:
Legal professionals who already use Westlaw and want faster research and drafting support.
Pros:
- Built on Westlaw’s legal content
- Supports research summaries and drafting assistance
- Easy to use with natural language prompts
- Helpful for large or complex research tasks
Cons:
- Requires a Westlaw Edge subscription
- Human review is still necessary
- Best results may require familiarity with the platform
3. Grammarly Business
What it does:
Grammarly Business is not a legal-specific tool, but it is a strong AI writing assistant for legal professionals. It helps with grammar, clarity, concision, tone, and style. It also includes plagiarism detection.
Why it is useful:
Legal writing depends on precision and professionalism. Grammarly helps clean up awkward phrasing, fix grammar issues, and improve readability without changing the core message.
Best for:
Any legal professional who writes emails, memos, briefs, contracts, or internal documents.
Pros:
- Strong grammar and spelling support
- Improves clarity and concision
- Includes plagiarism detection
- Works across many platforms and browsers
- Tone suggestions help with professional communication
Cons:
- May flag legal phrasing that is technically correct
- Does not understand legal context on its own
- Advanced legal terminology may be misread
4. BriefCatch
What it does:
BriefCatch is designed specifically for legal writing. It reviews briefs and motions for issues related to argument structure, citation format, readability, and court-rule compliance. It also provides suggestions for improvement.
Why it is useful:
It acts like a legal editor focused on briefs and filings. It can help catch issues that affect clarity, persuasiveness, and presentation under deadline pressure.
Best for:
Litigators who draft briefs, motions, and other court filings.
Pros:
- Built for legal document analysis
- Helps improve citations, structure, and readability
- Offers actionable editing suggestions
- Supports more polished and persuasive filings
Cons:
- More focused on editing than on drafting
- Less useful for general correspondence or non-litigation work
- May require adjustment to your writing style
5. Casetext CoCounsel
What it does:
CoCounsel is an AI legal assistant that supports research, document review, deposition preparation, contract analysis, summarization, and drafting. It can generate first drafts of motions, memos, and client communications.
Why it is useful:
It offers a broad set of legal AI functions in one place. For lawyers who need support across multiple tasks, it can speed up both research and writing.
Best for:
Solo practitioners, small firms, and larger practices looking for a versatile AI assistant.
Pros:
- Supports a wide range of legal tasks
- Useful for drafting and summarization
- Strong general AI capabilities
- Good for turning research into a first draft
Cons:
- Requires careful review of outputs
- Pricing may be a concern for some users
- May not match the direct database depth of Lexis+ AI or Westlaw Edge AI
6. ChatGPT
What it does:
ChatGPT is a general-purpose AI tool that can help draft text, summarize documents, brainstorm ideas, and rephrase content. With strong prompting, it can be adapted to different writing styles and formats.
Why it is useful:
It is accessible and flexible. For non-confidential work, it can be helpful for outlines, internal drafts, brainstorming, and simplifying complex language.
Best for:
Non-confidential legal tasks, idea generation, and early-stage drafting where the user can carefully review and verify the output.
Pros:
- Widely accessible
- Often more affordable than specialized legal AI tools
- Flexible across many writing tasks
- Can support drafting and brainstorming
Cons:
- Does not access real-time legal databases
- May miss recent legal developments
- Confidentiality concerns require caution
- Can generate inaccurate information, so it should never be used without review
How to Choose the Right AI Tool for Legal Writing
The best tool depends on your practice area, budget, workflow, and comfort with technology. A good choice starts with a clear understanding of your needs.
1. Identify your biggest pain point
Are you spending too much time researching? Do you need help polishing writing? Are you looking for faster drafting support? Knowing the main problem will narrow the field.
2. Use tools that fit your existing workflow
If your firm already relies on LexisNexis or Westlaw, their AI offerings may be the easiest place to start.
3. Match the tool to the task
BriefCatch is a strong choice for litigation writing. Grammarly is better for general polish. CoCounsel and Lexis+ AI are more useful for research and drafting support.
4. Check accuracy and reliability
Tools built into legal databases are generally better suited to legal research. General AI tools require more oversight, especially on legal specifics.
5. Compare cost against time savings
A more expensive tool may still be worthwhile if it saves enough time, improves consistency, or reduces errors.
6. Test before committing
Use trials or demos whenever possible. The best tool is the one that fits naturally into your workflow and actually improves it.
Pricing and Value Considerations
Pricing varies widely across the best AI tools for legal writing.
Lexis+ AI and Westlaw Edge AI Assistant are usually subscription-based and can be a significant investment. BriefCatch and CoCounsel also use subscription pricing, which may vary by user or firm size. These tools aim to justify their cost through faster work, fewer errors, and better efficiency.
ChatGPT is typically more flexible in pricing, with free and paid tiers. But lower cost does not automatically mean better value for legal work. Because it lacks direct legal database access and requires careful fact-checking, the time spent verifying its output should be part of the cost calculation.
When evaluating value, consider:
- time saved on research and drafting
- reduced editing and revision cycles
- improved consistency and readability
- fewer avoidable errors
- the ability to take on more work
For many firms, a tool that saves several hours each week can quickly become worthwhile.
Frequently Asked Questions
Can AI tools replace human legal writers?
No. AI tools can assist with drafting, research, and editing, but they cannot replace human judgment, legal strategy, or ethical responsibility. Final review by a lawyer is still essential.
Are AI tools secure for confidential client information?
Only if the vendor’s policies and security standards support that use. Legal-specific platforms are generally more appropriate for sensitive work than general-purpose AI tools. Always review data handling policies before use.
How do I verify AI-generated legal content?
Review every output carefully. Check citations, confirm legal accuracy, and make sure the content fits the facts, jurisdiction, and strategy of the matter. Treat AI text as a draft, not a final product.
Which tools are best for legal research and summarizing cases?
Lexis+ AI and Westlaw Edge AI Assistant are strong options because they are integrated with major legal research databases. CoCounsel also offers useful research and summarization features.
Can AI help with contract drafting?
Yes, especially for standard clauses, summaries, and issue spotting. But complex contracts still require legal expertise and careful review before anything is finalized.
Conclusion
AI is becoming a practical part of legal writing workflows. Tools like Lexis+ AI, Westlaw Edge AI Assistant, BriefCatch, CoCounsel, Grammarly Business, and ChatGPT can help lawyers research faster, draft more efficiently, and refine documents with less manual effort.
The best results come from using AI as an assistant, not a replacement. Choose tools that fit your practice, verify every important output, and use automation to support, not substitute, legal judgment. For lawyers who want to work faster without sacrificing quality, the best AI tools for legal writing can make a meaningful difference.