Switching From Westlaw To Lexis

Switching from Westlaw to Lexis in 2026 saves most firms 15-25% on legal research costs — but the transition has real friction that nobody talks about in the sales pitch. The Key Number System doesn't have a Lexis equivalent. Your saved research folders don't migrate. Your associates' muscle memory resets. The switch is worth it for the right firm, but it's not the painless migration Lexis sales reps describe.

Here's what's changed: Lexis has closed the AI gap with Westlaw, and in some areas surpassed it. Lexis+ AI provides conversational research grounded in verified Lexis sources — similar to CoCounsel but included in premium subscriptions rather than priced as a costly add-on. For firms where AI-powered research is the priority and the Key Number System isn't mission-critical, the Lexis value proposition has never been stronger.

What You Gain by Switching

Cost savings: Lexis has been pricing aggressively against Westlaw since 2024. Firms switching from Westlaw report 15-25% savings on comparable access levels. Lexis sales teams have explicit budget-matching programs designed to undercut your Westlaw renewal. The savings come from both lower per-user rates and bundled AI features that Westlaw charges separately for.

Lexis+ AI: Lexis's AI research assistant is included in premium subscriptions, not priced as a $100-200/user/month add-on like CoCounsel. The AI provides conversational research with answers grounded in Lexis's verified database — citations link directly to full-text sources with Shepard's verification. For firms evaluating whether to add CoCounsel to Westlaw, switching to Lexis provides comparable AI research at a lower total cost.

Secondary source depth: Lexis has broader coverage of treatises, law reviews, ALR annotations, and Restatements. If your practice relies on secondary sources for novel legal arguments, Lexis provides more material to work with. The Am Jur, ALR, and Matthew Bender treatise libraries are Lexis-exclusive.

Public records and news: Lexis's public records database and news archive are significantly stronger than Westlaw's. For firms that use legal research platforms for due diligence, background investigation, or media monitoring, Lexis provides capabilities that Westlaw charges add-on prices for.

What You Lose by Switching

The West Key Number System: this is the single biggest switching cost. The Key Number System organizes legal topics into a hierarchical taxonomy that enables precise topical research — finding every case addressing a specific legal principle regardless of how the court phrased it. Lexis has topic/headnote browsing, but it's not as refined or comprehensive as West's 100,000+ key numbers. For federal litigators who rely on key number research for exhaustive case finding, this loss is meaningful.

Practical Law: Westlaw's practice-ready templates, checklists, toolkits, and standard documents are the most comprehensive collection available. Lexis's Practical Guidance is the competing product, and while it's improved significantly, it doesn't match Practical Law's depth in transactional areas. Firms that use Practical Law templates daily will feel this gap.

Saved research and annotations: your Westlaw folders, saved searches, research trails, and document annotations don't migrate to Lexis. Years of organized research stay behind. This is the hidden switching cost that firms underestimate — it's not just the platform, it's the accumulated intellectual capital stored in it.

KeyCite vs. Shepard's: both citation verification services are excellent. Shepard's (Lexis) is marginally more comprehensive for treatment analysis. KeyCite (Westlaw) has a slightly faster update cycle for recent opinions. In practice, the difference is negligible — but attorneys have strong preferences, and changing citation verification tools disrupts established workflows.

The Migration Timeline and Process

Month 1 — Preparation: audit your firm's Westlaw usage. Pull usage reports showing which features, databases, and tools your attorneys actually use (not what they have access to — what they use). Identify the 20% of features that drive 80% of your usage. This audit determines whether Lexis covers your critical needs.

Month 2 — Parallel access: negotiate a 30-60 day parallel access period with Lexis where your firm runs both platforms simultaneously. This is standard — Lexis reps expect the request. Use this period for attorneys to test Lexis on real research tasks and identify coverage gaps specific to your practice.

Month 3 — Training: Lexis provides free training sessions for switching firms. Schedule practice-group-specific training, not generic overviews. Your litigation team needs different training than your transactional team. Assign one power user per practice group as the Lexis champion who supports colleagues during the transition.

Month 4 — Cutover: cancel Westlaw (watch for auto-renewal clauses — Westlaw contracts often require 90-day written cancellation notice). Maintain Lexis as the primary platform. Keep a record of any research tasks that Lexis couldn't handle during the parallel period — these are the edge cases you'll need alternative tools for.

Total transition time: 3-4 months from decision to full migration. Firms that rush the transition experience higher attorney frustration and lower adoption. Invest the time in parallel testing and training.

AI Feature Comparison: CoCounsel vs. Lexis+ AI

CoCounsel (Westlaw) strengths: more capable at multi-step workflows (research, then draft, then analyze), handles document uploads for contract review and deposition analysis, generates timelines from document sets. CoCounsel is the more versatile AI tool — it does more things.

Lexis+ AI strengths: tighter integration with the research platform (AI answers appear alongside traditional search results), better at point legal research questions with verified citations, and included in premium subscriptions rather than priced as a separate add-on. Lexis+ AI is the better value — it does fewer things but does them at comparable quality for less money.

The practical difference: if your firm's AI use is primarily legal research (asking questions, getting answers with citations), Lexis+ AI delivers comparable quality to CoCounsel at lower cost. If your firm needs AI for document analysis, contract review, and multi-step workflows, CoCounsel is more capable and justifies the add-on cost.

The cost math: Westlaw base ($200/user/month) + CoCounsel ($150/user/month) = $350/user/month. Lexis+ with AI ($175-$275/user/month all-in). For a 20-attorney firm, that's $84,000/year versus $42,000-$66,000/year — a savings of $18,000-$42,000/year for comparable AI research capability.

When NOT to Switch

Don't switch if your practice is built on Key Number research. Federal appellate litigators, insurance defense firms, and practices that rely on exhaustive topical case finding use the Key Number System in ways that Lexis can't replicate. If your associates run Key Number searches daily, the migration friction exceeds the cost savings.

Don't switch if your firm uses Practical Law templates extensively. Transactional practices (M&A, real estate, corporate governance) that pull Practical Law templates and checklists daily would need to rebuild their template library from Lexis's Practical Guidance — which covers less ground.

Don't switch mid-matter. If your litigation team is deep into a complex case with thousands of Westlaw-organized research documents, wait until the matter resolves. Migrating during active litigation creates unnecessary risk.

Don't switch for AI alone. If CoCounsel is the only Westlaw feature you want to replace, consider adding Lexis as a supplementary subscription for AI research rather than replacing Westlaw entirely. Some firms run both platforms at reduced tiers — Westlaw for database access and Key Number research, Lexis for AI-powered research and secondary sources.

The Bottom Line: Switching from Westlaw to Lexis saves 15-25% for most firms and provides comparable AI research capabilities (Lexis+ AI) without CoCounsel's add-on pricing. The migration costs are real — you lose the Key Number System, Practical Law, and your saved research library. Allow 3-4 months for the transition with parallel access. Don't switch if Key Number research or Practical Law templates are critical to your daily practice. For everyone else, the math favors Lexis in 2026.