Legal AI Word Add-Ins Compared: 13 Tools and What Each Does in Word (2026)

A Microsoft Word add-in is no longer what sets a legal AI tool apart. Most of the tools below put an assistant in a Word side panel. The differences are in how they write edits back, what they check a contract against, and whether you can see a price.

Reviewed and corrected on 12 October 2026. This is general information, not legal advice. Each product statement below is taken from a page the vendor publishes, named where it appears and read on 12 October 2026. These add-ins change quickly, so open the live page before you buy. Where a page was silent on a point, we say that instead of filling the gap.

This is a field map of thirteen tools that put an AI assistant inside Word: what each vendor's own pages say it does on the open document, and what those pages leave out. It is a comparison of vendor claims, not a test. We did not run any of these tools on a contract, and nothing here ranks them.

Short answer: There is no single best legal AI Word add-in. The tools differ by buyer. Some sell to large firms through sales teams, some publish a price, and some are general assistants (Microsoft Copilot, Claude) that say plainly they need a lawyer's review. Before you trial any of them, check three things on your own paper: whether edits arrive as native Word tracked changes, what the tool compares the contract against (your playbook, your precedent, or nothing), and whether anyone will give you a written price.

TL;DR

• Tracked changes are described differently by each vendor. Harvey, Genie, Ironclad, Spellbook, LegalOn and Claude for Word say on their own pages that edits land as tracked changes. GC AI's documentation lists "tools for tracked changes." Several others (CoCounsel, DraftWise, Gavel, Luminance) describe redlining in Word without using the words "tracked changes" on the pages we read. Test this on a real contract.
• Microsoft's own features open from the Copilot panel in Word. Edit with Copilot writes into the document you have open. The Legal Agent is a separate Frontier preview that opens in its own task pane, reads your open document and a .docx playbook, and writes back as tracked changes. Older write-ups that say Copilot cannot do either are out of date.
• Playbooks are common. Harvey, CoCounsel, Spellbook, LegalOn, GC AI, DraftWise, Gavel, Ironclad, Genie and Microsoft's Legal Agent all describe a playbook feature on their own pages.
• Few vendors publish a price. Genie, GC AI and Gavel show a figure on their own pages. Spellbook says pricing is custom. We found no price on the pages we read for Harvey, CoCounsel, LegalOn, DraftWise, Ironclad, Luminance or Definely.
• Microsoft and Anthropic both tell users to review the output. Microsoft says AI-generated content may be inaccurate and is not a substitute for the judgment of a qualified legal professional. Anthropic says not to rely on Claude for Word for litigation filings or audit-critical documents without verification.

Part of our document tools and redline guide series. For the buyer's view, see legal AI for in-house counsel and the legal AI seat-cost buyer guide.

The general assistants in Word

Microsoft Copilot, Edit with Copilot and the Legal Agent

Microsoft has two separate features that act on an open Word document, and older comparisons usually blur them. Both are reached from Copilot inside Word, so the question for each is where you find it, what it reads and what it writes back.

Edit with Copilot. Microsoft's support page "Edit with Copilot in Word" tells you to open Word, sign in with a Copilot-enabled account, find Copilot in the Home tab or sidebar, and choose Tools > Edit with Copilot in the prompt box. It reads and edits the document that is open: you can ask Copilot to create, edit, refine and format content in place using Word's built-in styles, and you can point it at another document, email or meeting as a source. The page says it "can only create content in the currently open document" and cannot create new files, and that integration with external tools is not supported. On what it writes back, the page lists limits: it cannot generate or insert images, and it cannot add or modify comments (a comment may be deleted if Copilot changes the paragraph it is anchored to). It cannot switch Track Changes on or off or accept and reject tracked changes, but it will respect Track Changes, so edits are tracked when you have it enabled. In a shared document using Work IQ, the page says Copilot shows a preview in chat that you must confirm before anything is applied. The page says the feature is rolling out to users with a Microsoft 365 Copilot license (or Microsoft 365 Premium for individuals), lists Microsoft 365 Personal and Family as coming soon, and says that in some cases it is reached through the Insiders or Frontier programs.

The Legal Agent. Microsoft's support page "Get started with the Legal Agent (Frontier)" says it is a preview feature available in Copilot for Word desktop. You open Copilot in Word, click the + button in the chat input and choose Legal Agent (Frontier), and it opens in a new task pane. The first time, you need to restart Word, and the page says it is not in the Copilot Agent Store and can only be reached from Word. Prerequisites on the page: an active Microsoft Copilot license, enrollment in the Frontier program and Word version 2604 or higher.

What it reads: the whole open document, or only the section you highlight. Its answers carry numbered, clickable citations, and clicking one highlights the part of the document the agent used. What it writes: redlines proposed as tracked changes, which you insert with Accept or Accept with Comment. For a playbook review, you add a .docx playbook from your computer or SharePoint, and the agent converts it into a "skill" of topics and rules that you can edit before it reviews the contract. The page says you can currently review documents only from playbooks, not from templates or other documents.

Microsoft's Message Center post MC1388706 (published 12 June 2026, last updated 7 October 2026) says the Frontier preview reached users worldwide from mid-June 2026, that no separate installation is required, and that it is enabled by default for tenants enrolled in Frontier with no dedicated toggle to turn it off. Its 7 October update says general availability "will now be tracked separately in an upcoming MC post," with no date. We read that post through a public archive of Message Center (mc.merill.net) because the Microsoft admin center needs a login.

The Legal Agent page warns that its output may be inaccurate and that it is not a substitute for the judgment of a qualified legal professional. For the longer version, see can Microsoft Copilot review a contract and Copilot for lawyers. For how these Microsoft redlines sit next to compare engines and playbook tools, see legal redline software compared.

Claude for Word (Anthropic)

Anthropic's documentation page "Use Claude for Word" says the add-in is generally available to Pro, Max, Team and Enterprise plans. It lists answers with clickable section citations, editing selected text while preserving formatting, a tracked changes mode in which "every edit lands as a revision you can accept or reject in Word's native review pane," working through comment threads, summarizing counterparty redlines, and filling templates.

The same page has a "Current limitations" section. It says Claude for Word is not recommended for final client deliverables or counterparty sends without human review, litigation filings or audit-critical documents without verification, or replacing legal or financial judgment. It also carries a prompt-injection warning: use it only with trusted documents, because hidden instructions in a counterparty file can try to manipulate the add-in. The page does not describe a legal research database, so treat the clickable citations as pointers into your own document.

The legal-specific add-ins

Everything below comes from the vendors' own pages, listed in the sources at the end. Three of the add-ins (CoCounsel, DraftWise and Luminance) have a Microsoft AppSource listing in our sources. Where we write "not stated," the pages we read were silent on the point.

Harvey

Harvey's blog post "Run Custom Harvey Agents Directly in Word" (23 September 2026) says custom agents built in its Agent Builder now run in the Harvey for Word Add-in, for tasks such as NDA review, redlining and summarization. When you apply a suggestion, "Harvey inserts the edit as a tracked change, so you can accept or reject it in Word." The post lists built-in Word tools including Playbooks, Redact, Translate, Proofread, Convert to Template and Fill Template. Harvey's homepage describes a platform for law firms and in-house teams and names no price. Pricing: not stated.

Thomson Reuters CoCounsel

The Microsoft AppSource listing for "CoCounsel for Microsoft Word" says it helps you find a starting point using Practical Law Standard Documents and your own precedents, draft clause language grounded in Practical Law, build a clause library, create and compare your own or Practical Law playbooks against third-party contract clauses, and "automate redlining with deviation detection." It says a Thomson Reuters subscription is required. Whether edits arrive as native tracked changes: not stated on the listing. Pricing: not stated.

Spellbook

Inside Word, Spellbook is five named tools on its homepage: Review, Draft, Ask, Benchmarks and Associate, which it says work "directly in Word." On how it writes back, its help center article "Examine Documents with Reviews" describes a "Use tracked changes" toggle for redline revisions. Its pricing page says pricing is determined by the number of team members on a license and gives no figure, and its homepage offers a 7-day free trial.

LegalOn

LegalOn's Word page says you can review contracts, draft language and access your organization's playbooks and clause library in Word. On writing back, its blog post "Direct Editing in Word and Prompt Library" says that in the LegalOn Word add-in the assistant applies edits and returns tracked changes. Its homepage describes 135+ attorney-built playbooks. Pricing: not stated on the pages we read.

GC AI

GC AI's documentation page "GC AI for Word" says the add-in uses the same chat service as the web app "with additional tools for tracked changes, comments, and document edits," and that it can redline clauses or a whole agreement. Its FAQ says it can read tracked changes in the open document. Its pricing page lists an Individual plan at $500, and a GC AI blog post describes the published price as $500 per seat per month. Team and Enterprise are on request. It says US Case Law and International Law databases are add-ons for Individual seats.

DraftWise

DraftWise's in-house page lists what you can do from Word as "redline, rewrite, compare clauses, apply playbooks, and insert language," and says the redlines are based on your guidelines and negotiation history. It has an AppSource listing (see sources). Native tracked changes: not stated on the pages we read. Pricing: not stated.

Genie

Genie's blog post "GenieAI's Microsoft Word Add-in brings AI legal review and drafting into Word" (11 March 2026) says the add-in reviews clause by clause and suggests redlines as tracked changes. Genie's pricing page lists a free plan, Pro at $75 per month (or $59 per month billed annually), Business at $320 per month (or $259 billed annually), and Enterprise from $600 per month.

Gavel Exec

On Gavel's homepage, Gavel Exec is the tool for reviewing, redlining and drafting in Word and online. The page says it puts "suggested redlines and negotiation-ready comments directly in Word" and offers built-in or custom playbooks. It lists 25 free queries per user during the trial and "1,000 completions for $160/month per user." Native tracked changes: not stated on the homepage.

Ironclad Jurist

Ironclad is a contract lifecycle platform, and its Word integration page describes searching and saving Ironclad documents from Word. On the same page, Jurist is the AI review layer: the redlines it builds from your playbook "generate tracked changes and rationale based on approved negotiation positions." Pricing: not stated.

Luminance

Luminance has a Word add-in on Microsoft AppSource. The listing says a subscription is required and the add-in can read and make changes to your document. Its homepage describes a contract intelligence platform for negotiation, discovery and workflow. What the Word add-in does to a draft, and whether edits are tracked changes: not stated on the pages we read. Pricing: not stated.

Definely

What Definely does in Word is reading help: its homepage says its tools let you see definitions, provisions and cross-references without leaving the clause you are working on. Its Cascade page describes AI-powered impact analysis of which clauses, definitions and references a change may affect. The homepage also says you can export "tracked changes, redlines, and comments into a clean, shareable issues list." Pricing: not stated.

Side by side

The table below only repeats the entries above. A "Not stated" cell means the pages we read were silent, which is different from "no."

What to ask any vendor

The questions below come from the gaps in the table. They apply to every product on this page.

• Show me an edit arriving in a contract that is already full of the other side's tracked changes. Can I accept or reject each one in Word?
• What does the tool compare the contract against: my playbook, my precedent, a vendor library, or nothing?
• Does it cite legal authority, or only point to text in my own document? Who checks that an authority exists?
• Where does my contract go, who is the model subprocessor, and are prompts used for training? (Read the vendor's security page, not a blog.)
• What is the price for my number of seats, in writing, including usage limits and add-ons?

For the deeper mechanics of each job, see our guides on AI contract review, AI legal drafting, comparing document versions with AI, and legal redline software.

For the US statutes, regulations and court rules these laws sit in, see the US primary law API.

FAQ

Do all these tools write native Word Track Changes? Not on the evidence of their own pages. Harvey, Genie, Ironclad, Spellbook, LegalOn and Claude for Word say edits land as tracked changes, and GC AI's documentation lists tools for tracked changes. The pages we read for CoCounsel, DraftWise, Gavel and Luminance describe redlining or editing in Word without saying so. Microsoft's Edit with Copilot respects Track Changes when it is on. Confirm it in a trial.

Where do Microsoft's Copilot features show up in Word, and what do they touch? Edit with Copilot is chosen from Tools in the Copilot prompt box and edits the document you have open, and the Edit with Copilot page says it cannot add or modify comments. The Legal Agent is opened from the + button in the Copilot chat input, appears in its own task pane in desktop Word, and writes playbook-driven redlines as tracked changes. Microsoft describes it as a Frontier preview. See can Microsoft Copilot review a contract.

Which legal AI Word add-ins do legal research? Our pages do not support a ranking. Claude for Word's documentation describes citations into your open document, not a research database. GC AI's pricing page lists US Case Law and International Law databases as add-ons or plan options, and CoCounsel's AppSource listing describes drafting grounded in Practical Law content. Check each vendor's current page for what research it includes and what authority it can cite.

What does a legal AI Word add-in cost? It ranges from free to sales-quoted. On their own pages, Genie lists a free plan and paid plans from $75 per month, GC AI lists an Individual plan at $500, and Gavel lists $160 per month per user for Exec. Spellbook says its pricing is custom by team size, and we found no price on the pages we read for the others. See our legal AI seat-cost buyer guide for how to compare.

Is Microsoft going to make these add-ins obsolete? We cannot know that. What the pages show today: Microsoft has a preview Legal Agent in Word with a playbook review flow, and its own documentation says general availability will be tracked separately with no date. How the market responds is a question for your own evaluation.

Sources

Every vendor page below was read on 12 October 2026.

• Microsoft Support: Edit with Copilot in Word and Get started with the Legal Agent (Frontier). Message Center post MC1388706, read through a public archive.
• Anthropic: Use Claude for Word.
• Harvey: Run Custom Harvey Agents Directly in Word, 23 September 2026, and the homepage.
• Microsoft AppSource listings: CoCounsel for Microsoft Word, DraftWise and Luminance, plus the Luminance homepage.
• Spellbook: pricing page and the help center article "Examine Documents with Reviews" (the help center blocks automated requests).
• LegalOn: Word page and Direct Editing in Word and Prompt Library.
• GC AI: GC AI for Word, its Word FAQ, pricing and the blog post Best Legal AI Tools for In-House Counsel.
• DraftWise: in-house page.
• GenieAI: Word add-in announcement, 11 March 2026, and pricing.
• Gavel: homepage.
• Ironclad: Microsoft Word integration.
• Definely: homepage and Cascade.

Plans and features change often, so confirm anything above on the vendor's own page before you act on it.

Vaquill AI

Product & Content

The US primary law data API: statutes, regulations, constitutions, court rules, executive orders and agency guidance across 53 US jurisdictions, each section cited and linked to its official source, via REST, MCP or SQL.