The comparison
| Tool | Main job | Who it's built for | Published pricing | What we couldn't verify |
|---|---|---|---|---|
| CoCounsel Legal (Thomson Reuters) | Research, analysis and drafting from one query, grounded in Westlaw content, Practical Law and your own documents; Westlaw Brief Builder; Tabular Analysis of up to 10,000 documents against 100 questions | Legal teams that already work in Westlaw; works in Microsoft Word, Outlook and Teams, and connects to iManage, NetDocuments, SharePoint and Box | None on the page; "View plans", free trial and demo requests, or contact sales | Jurisdiction list (the page names none), which plan needs a Westlaw subscription, accuracy, SOC 2 and ISO 42001 claims |
| vLex Vincent AI | Research questions, 50-State Survey, Compare Jurisdictions, complaint and pleading analysis, contract and redline analysis; Vincent Studio for custom workflows | Litigators, transactional lawyers and legal teams that work across countries | None on the page; "Start a Free Trial" and "Book a Demo" | Drafting from a prompt (page describes analysis, not drafting), integrations, accuracy and productivity claims, SOC 2 and ISO 27001 claims |
The vLex pricing page returned HTTP 403 to us, so we could not verify anything there. Product and pricing may change.
Who each is for
CoCounsel Legal. Thomson Reuters describes it as research, analysis and drafting from a single query, reasoning from Westlaw, Practical Law and the firm's own knowledge, with linked citations to verify. It's thin on stated coverage: the product page names no jurisdictions, and it doesn't say which plans need a Westlaw subscription. See our CoCounsel profile and CoCounsel pricing page.
vLex Vincent AI. The vendor says its database covers over 1 billion documents from 100+ countries, with country pages for 17 jurisdictions, and a 50-State Survey for the US. Its document features are contract analysis, redlines and comparison; the page doesn't describe a general drafting tool and lists no third-party integrations. Our Vincent AI profile has more background.
Agents and workflows. CoCounsel says it uses generative and agentic AI for deep research and litigation document analysis. Vincent describes a Workflow Engine, 20+ pre-built workflows and "a suite of agents"; Vincent Studio is described as for large firms and enterprise teams. Neither claim has been tested by us.
Pricing, as shown on October 21, 2026
- CoCounsel Legal: not published on its product page. The page lists plan options (Westlaw Edge, Westlaw Advantage, CoCounsel Essentials, CoCounsel Legal, Practical Law) and sends you to a trial, demo or sales. Our pricing explainer covers what's known beyond the vendor page.
- vLex Vincent AI: not published on its product page, which offers a free trial and a demo. The pricing page returned 403.
What we couldn't verify
- Any price for either product, including whether CoCounsel Legal needs a separate Westlaw subscription.
- Which jurisdictions CoCounsel Legal covers, since its page lists none.
- Security certifications: CoCounsel says "SOC 2 and ISO 42001 certified"; vLex claims SOC 2 and ISO 27001 compliance. We saw no certificates.
- vLex's customer, productivity and reliability statistics (it cites benchmarking and trials without a method on the page).
- Accuracy and citation reliability for both; nothing was tested.
- Whether Vincent drafts from a prompt, and whether it integrates with Word or document systems.
- Who owns or sells vLex today; we left corporate claims out.
- Trial terms for both.
How we'd test the two in a week
- Pick three closed matters in your jurisdiction and write down the answers you already know are right.
- Run the same research questions in each tool and check every citation against the primary source.
- Run one cross-jurisdiction question (a state survey, or a non-US question if you need that) in each.
- Give each a real complaint or contract and compare what it flags, misses or invents.
- Ask each for its security documentation, data retention terms and a written quote.
Sources
- CoCounsel Legal product page (read October 21, 2026) (Vendor claims; capabilities, plan names, integrations, security, no price)
- vLex Vincent AI product page (read October 21, 2026) (Vendor claims; coverage, workflows, security, no price)
- vLex pricing page (attempted October 21, 2026) (Returned HTTP 403; could not verify)
Questions and answers
CoCounsel vs vLex: which is better for legal research?
We haven't tested either, so we can't rank them. CoCounsel Legal is grounded in Westlaw and Practical Law; Vincent is built on vLex's database, which the vendor says spans 100+ countries. Match the content to the jurisdictions you work in.
Vincent AI vs CoCounsel: which covers more jurisdictions?
By their own pages, only Vincent lists them: 17 country pages and a 50-State Survey. CoCounsel Legal's product page names no jurisdictions, so we can't compare coverage.
How much does CoCounsel cost?
Thomson Reuters doesn't show a price on the CoCounsel Legal product page; it points to plans, a trial, a demo or sales. See our pricing explainer for more.
How much does Vincent AI cost?
vLex doesn't show a price on the Vincent AI product page, which offers a free trial and a demo. Its pricing page returned a 403 error for us.
Can I use CoCounsel or Vincent AI for drafting?
CoCounsel Legal says it turns a request into a draft with linked citations, and offers Westlaw Brief Builder for briefs. Vincent's page describes contract analysis, redlines and comparison, not general drafting. Compare in the Westlaw, Lexis and vLex guide and our CoCounsel vs Lexis AI page.
Operational information, not legal advice. Tool descriptions are each vendor's own claims, read October 21, 2026; we did not test any product. Prices change; check the vendor page before you decide.