Here's the fact most "Casetext vs Westlaw" articles bury: Casetext isn't an independent AI challenger anymore. Thomson Reuters — the same company that owns Westlaw — bought Casetext for $650 million in June 2023 and has spent the time since folding its CoCounsel AI assistant into the Westlaw product family. The "scrappy AI startup taking on the legal research giant" narrative that drives searches for this comparison is out of date. What you're actually comparing today is two products from one parent company, aimed at different budgets and different jobs.
That doesn't make the comparison pointless — it makes it more useful, because the real question isn't "which company wins" but "which product fits your practice." Westlaw is the full legal research platform: primary law in every U.S. jurisdiction, the KeyCite citator, treatises, litigation analytics, and now CoCounsel's AI layered on top for firms paying for the premium tier. Casetext/CoCounsel, sold on its own or as an add-on, is narrower and cheaper: AI-driven case law search, contract review, deposition prep, and legal drafting, without the full Westlaw research stack underneath it.
This matters most for solo practitioners and small firms deciding where research and drafting budget should go, since neither company publishes real pricing and both run quote-based enterprise sales. We pulled from public pricing pages, vendor disclosures, and documented user reports to build the comparison below — treat any dollar figure here as a starting point for negotiation, not a sticker price you'll actually be quoted.
Side-by-Side Comparison
| Feature | Casetext | Westlaw |
|---|---|---|
| Feature | Casetext | Westlaw |
| Starting price | ~$99/mo per user (CoCounsel Core, quote-based) | ~$200+/mo per user (quote-based, varies by plan tier) |
| Free trial | Yes (self-serve trial historically offered) | No (sales demo only, no self-serve trial) |
| Mobile app | No (web-based only) | Yes (Westlaw mobile app for iOS/Android) |
| Time tracking | N/A — not a practice management feature | N/A — not a practice management feature |
| Client portal | No — not built for client-facing use | No — not built for client-facing use |
| Integrations | ~10+ (Word, Outlook, limited DMS support) | 25+ (Word, Outlook, Clio, PracticePanther, MyCase, iManage, NetDocuments) |
| Document storage | Add-on (matter workspace, not a full DMS) | Add-on (Doc & Form Builder, not a full DMS) |
| Support | Chat + email (phone via account rep) | Phone+chat (24/7 reference attorney hotline) |
The elephant in the room: same parent company
Any honest comparison has to start with ownership. Casetext was an independent company from 2013 until Thomson Reuters acquired it in June 2023 for $650 million — at the time, the largest legal-AI acquisition on record. Since then, Thomson Reuters has been consolidating the Casetext brand into "CoCounsel," its umbrella name for AI legal assistant products, and selling it both standalone and as an add-on to Westlaw subscriptions. If you're choosing Casetext specifically because you want an alternative to a Thomson Reuters product, that reasoning no longer holds — your subscription dollars go to the same company either way.
What you're really choosing between is scope, not vendor independence. Westlaw is the deep, broad research platform Thomson Reuters has run for decades. Casetext/CoCounsel is the lighter, AI-native layer the same company built (and bought) to compete on price and speed for a narrower set of tasks. Framing this as "AI upstart vs. entrenched giant" sells a story that stopped being true three years ago — framing it as "full platform vs. focused tool from the same vendor" is what actually helps you decide.
For firms already paying for full Westlaw access, CoCounsel is increasingly sold as a bolt-on rather than a replacement, which tells you how Thomson Reuters itself views the relationship between the two products.
Research depth and coverage
Westlaw's core strength hasn't changed: KeyCite, its citator, remains the industry benchmark for confirming a case is still good law, and its case law database covers every U.S. federal and state jurisdiction going back further than any competitor's free or discount tier. It also bundles secondary sources — treatises, American Law Reports, Am Jur, practice guides — that matter for anyone building an argument from scratch rather than just checking a citation.
Casetext's original strength was CARA A.I., a tool that let you upload a brief and get relevant case law pulled automatically, which was genuinely faster than manual Boolean search for that specific task. CoCounsel extended this into broader AI research, but it draws from a narrower underlying case law corpus than full Westlaw, and it does not include KeyCite. If your practice depends on citator-level certainty across obscure jurisdictions — appellate work, multi-state litigation — Westlaw's depth is not optional.
For contract review, deposition question generation, and first-draft memo writing, CoCounsel's AI is faster and cheaper than paying a Westlaw subscription plus associate hours for the same task. That's a real, distinct use case — it's just not "legal research" in the KeyCite sense.
AI drafting vs. AI research
This is where the two products genuinely diverge in capability, not just price. CoCounsel is built around discrete AI "skills" — review a contract against a checklist, summarize a deposition transcript, draft a demand letter — that produce usable first drafts in minutes. It's a document-workflow tool with legal knowledge baked in, and it's the stronger product for transactional and high-volume document review work.
Westlaw's AI additions (branded under Westlaw Edge and now increasingly CoCounsel-branded features layered on top) are oriented toward research: summarizing case law, surfacing analogous fact patterns, and answering research questions with citations back to primary sources. It's AI applied to search, not AI applied to drafting. If your bottleneck is "I need to review 200 contracts by Friday," CoCounsel is the better fit. If your bottleneck is "I need to know if this circuit split has been resolved," Westlaw is.
Pricing opacity and contract terms
Neither company publishes real pricing, and both push prospective buyers toward a sales call rather than a self-service checkout — standard practice for enterprise legal software, but worth calling out because it makes comparison shopping harder than it should be. Public reporting and user disclosures put CoCounsel starting around $99–$150 per user per month depending on the skill package, while full Westlaw access commonly runs $200–$500+ per user per month depending on jurisdiction breadth and add-ons, with multi-year contracts the norm rather than the exception.
The practical move: get quotes for both from the same Thomson Reuters rep in the same conversation. Since 2023, sales teams are increasingly bundling CoCounsel into Westlaw renewals as an upsell, which means there's often more room to negotiate a combined price than either product's list price suggests.
Who Should Choose Each
Choose Casetext if you…
- Solo and small-firm attorneys doing high-volume contract review who need fast AI-drafted first drafts, not deep citator research
- Transactional and corporate attorneys whose work is mostly document review, not case law argument-building
- Firms testing whether AI tools can absorb research/drafting work before committing budget to a full Westlaw seat
- Firms already using a different research platform (Lexis, Fastcase) that want to add AI drafting without switching their primary research tool
- Litigation support staff who need fast deposition and transcript summarization on a tight budget
Choose Westlaw if you…
- Litigation-heavy firms that depend on KeyCite to confirm case validity before filing
- Appellate practices needing exhaustive, citator-verified case law across multiple jurisdictions
- Firms that use secondary sources (treatises, Am Jur, ALR) as a core part of their research process
- Firms needing litigation analytics — judge behavior, opposing counsel history, motion outcome data — that CoCounsel doesn't offer
- Firms with existing enterprise Thomson Reuters contracts who can negotiate bundled Westlaw + CoCounsel pricing rather than buying either standalone
Final Verdict
Buy Westlaw if your practice lives or dies on research depth and citation reliability — litigation, appellate work, anything where "is this still good law" is a question you ask daily. Nothing on the market, including CoCounsel, matches KeyCite's coverage or Westlaw's secondary-source library, and that depth is worth the higher price for firms whose work depends on it.
Buy Casetext/CoCounsel if your actual bottleneck is document volume, not research depth — contract review, deposition prep, first-draft memos — and you don't need a full research platform to do it. Just go in clear-eyed: you're not choosing an independent alternative to Thomson Reuters, you're choosing a narrower, cheaper product from the same company. For most solo and small-firm buyers reading this comparison, that's still the right trade — but make it because it fits your workflow, not because you think you're betting against the incumbent.