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The short answer

If you're choosing between Casetext (CoCounsel) and Westlaw AI for legal research and drafting, the honest bottom line: Casetext is the better value for most solos and small firms, Westlaw is the safer call for litigation-heavy or appellate practices.

Casetext CoCounsel costs about 40-60% less per attorney, ships AI workflows that match how solos actually work day-to-day, and has closed most of the accuracy gap with Westlaw since the 2023 AI rebuild. Westlaw still has the deeper case law database and the more mature citator network for comprehensive precedent research.

The interesting twist: Thomson Reuters owns both products as of late 2023. They are positioned at different price points to serve different buyers, but the underlying legal data infrastructure increasingly overlaps. That changes the calculus more than most attorneys realize.

Who this comparison is for: Solo attorneys and small firms (1-10 attorneys) evaluating AI legal research and drafting platforms, or considering switching from a traditional research tool. Pricing and features verified as of May 2026.

Pricing comparison

The price gap is the biggest single factor for most firms. Westlaw is significantly more expensive across every tier.

Plan or Tier Casetext CoCounsel Westlaw AI Edge
Entry tier ~$250/user/mo ~$400/user/mo (Westlaw Edge) Casetext wins
Mid-tier ~$350/user/mo (Pro) ~$500/user/mo (Westlaw AI suite) Casetext wins
Premium Custom (Enterprise) ~$700/user/mo (full AI + analytics) Casetext wins
Free trial 7-day trial available Demo only, no public free trial Casetext wins
Annual discount ~10-15% Negotiable Tie
Setup fee None None for standard, custom for enterprise Tie

For a 5-attorney firm, the annual delta between Casetext at $250 and Westlaw Edge at $400 is roughly $9,000. At the higher tiers, the gap widens to $20,000 or more annually. That's real money for a small firm. The deciding question is whether Westlaw's deeper coverage justifies the spend for your specific practice mix.

Feature comparison

Both platforms cover the core legal research workflow: case law search, citator analysis, statutes and regulations, secondary sources, and AI-driven drafting. Where they diverge is in coverage depth and AI workflow design.

Feature Casetext CoCounsel Westlaw AI Edge
Case law database Comprehensive federal + state Deepest in the industry Westlaw wins
Citator SmartCite (good) KeyCite (industry standard) Westlaw wins
AI legal research ✓ Natural-language Q&A, fast summaries ✓ Westlaw AI Assistant, comprehensive Tie
AI drafting (memos, motions) CoCounsel Memo, industry-leading Westlaw Drafting Assistant, solid Casetext wins
Document review CoCounsel Document Review Westlaw Quick Check Judicial Casetext wins
Deposition prep CoCounsel Deposition Prep skill Limited Casetext wins
Contract analysis CoCounsel Contract Analysis Practical Law Connect (separate product) Casetext wins
Practice area analytics Limited ✓ Westlaw Edge Litigation Analytics Westlaw wins
Brief check / argument check SmartCite-based brief check ✓ Quick Check Judicial, more thorough Westlaw wins
Time to productive use 1-3 days 1-2 weeks (more complex platform) Casetext wins

AI capabilities compared

This is where Casetext's bet on AI-first design pays off most clearly. CoCounsel's AI workflows are tighter, faster, and more native to how solo attorneys work day-to-day.

Casetext CoCounsel ships nine "skills" that handle distinct legal tasks: Memo, Document Review, Deposition Prep, Contract Analysis, Contract Policy Compliance, Search a Database, Summarize, Draft Correspondence, and Timeline. Each skill is workflow-optimized rather than a general chatbot. You drop in a fact pattern, pick a skill, get usable output in 30-90 seconds. The AI accuracy on first-pass drafts has reached the point where most outputs need editing rather than rewriting.

Westlaw AI is more general-purpose. The AI Assistant answers natural-language legal questions with citations, integrates with the broader Westlaw search, and powers Quick Check Judicial for brief argument verification. The drafting features are improving but feel less workflow-oriented than Casetext's skill-based approach. Westlaw's strength is grounding AI responses in their deep case law database, which means the citations are more reliable for serious litigation work where every cite needs to hold up.

For day-to-day legal research and drafting, Casetext is faster. For appellate brief writing where citation reliability matters more than speed, Westlaw is safer.

Head-to-head scores

Category scores (out of 10)
Case law depth
Casetext
8.5
Westlaw
9.6
AI workflow speed
Casetext
9.3
Westlaw
7.8
Drafting quality
Casetext
9.0
Westlaw
8.2
Citation reliability
Casetext
8.4
Westlaw
9.5
Value for solo or small firm
Casetext
9.2
Westlaw
6.5

Pros and cons

Casetext CoCounsel

Pros
  • 40-60% cheaper than Westlaw at every tier
  • Industry-leading AI drafting with skill-based workflows
  • Fastest time to productive use (1-3 days)
  • Deposition prep and contract analysis built in
  • Free 7-day trial available
  • Best fit for solo and small firm workflows
Cons
  • Case law database is comprehensive but not as deep as Westlaw
  • SmartCite citator is solid but trails KeyCite reputation
  • Limited litigation analytics
  • Brief check less thorough than Westlaw Quick Check

Westlaw AI

Pros
  • Industry-deepest case law database
  • KeyCite is the gold-standard citator network
  • Westlaw Edge Litigation Analytics for case strategy
  • Quick Check Judicial for thorough brief verification
  • The safer call for citation reliability in serious litigation
  • Stronger institutional muscle memory in larger firms
Cons
  • $150-300/user/mo more expensive at every tier
  • Steeper learning curve, longer ramp to productivity
  • AI workflow is general-purpose, less skill-optimized than CoCounsel
  • No public free trial
  • Drafting features improving but not yet at CoCounsel level

Our final verdict

Choose Casetext CoCounsel if...

You're a solo or small firm focused on cost and speed, your practice is general civil or transactional, you value AI workflows over comprehensive case law coverage, or you want a tool that gets you from question to usable draft in under five minutes. The 40-60% price savings adds up fast for solos, and the AI skill-based approach matches how solos actually work. For most practices, this is the right starting point.

Choose Westlaw AI if...

You're in litigation, appellate, or complex multi-jurisdiction work where citation reliability and case law depth matter more than monthly cost. The premium pays back when you need to verify every cite holds up under appellate scrutiny, when you need litigation analytics for case strategy, or when you're working at a firm that already has institutional muscle memory on Westlaw search. For high-stakes practice areas, the extra spend is justified.

Ready to try one?

Casetext offers a 7-day free trial. Westlaw requires a demo call. Pick the one that matches your practice and run a real research task on it.

Try Casetext Free → Visit Westlaw →

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Frequently asked questions

Are Casetext and Westlaw AI owned by the same company?
Yes. Thomson Reuters acquired Casetext in 2023 for $650 million. Both products now sit under the same parent company, but they remain separate platforms with different pricing, different AI implementations, and different positioning. Casetext (now branded Casetext CoCounsel) is the lower-priced, AI-first option. Westlaw AI is the premium platform with deeper case law databases and longer-established authority.
Is Casetext CoCounsel cheaper than Westlaw AI?
Yes, significantly. Casetext CoCounsel runs about $250 per user per month at the standard tier. Westlaw AI starts around $400 per user per month and the comprehensive Westlaw Edge AI tier runs $500-700 per user per month depending on coverage. For a 5-attorney firm the annual delta is $9,000-27,000.
Which platform is more accurate for legal research?
Westlaw still has the deeper case law database and the more mature citator network. For deep-dive precedent research and comprehensive coverage of state and federal case law, Westlaw is more thorough. Casetext CoCounsel's AI summaries and natural-language Q&A are faster for practical day-to-day questions but skew toward most-relevant cases rather than exhaustive coverage. The accuracy gap has narrowed dramatically since Casetext's AI rewrite, but Westlaw is still the safer call for complex multi-jurisdiction research.
Can Casetext draft contracts and motions like Westlaw AI?
Both can. Casetext CoCounsel's drafting was the original killer feature when it launched in 2023, and the CoCounsel skills (Memo, Document Review, Deposition Prep, Contract Analysis) are still industry standard. Westlaw AI now offers comparable drafting features integrated into Westlaw Drafting Assistant. For draft quality on first pass, Casetext still has a slight edge. For legal accuracy of citations in those drafts, Westlaw is more reliable.
Which platform should a solo attorney choose?
For most solo attorneys, Casetext CoCounsel is the better starting point. The lower price, the AI-first workflow, and the faster ramp-up time match how solos actually work. Westlaw AI makes more sense for litigation-heavy practices, complex appellate work, or firms that already have institutional muscle memory on Westlaw search. The "spoiler" on this one: the gap between the two is much smaller than the price difference suggests.