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AI-powered case law research

Need a precedent validated? Just ask Lewis.

Research case law in plain language inside Claude. Lewis searches federal and state opinions, checks your citations, and surfaces supporting and adverse authority — with every source a click away.

Join the waitlistFree trial — coming soon

Ask.

Describe the issue the way you would to a colleague. Lewis scopes the research — courts, posture, date range — before it searches.

Verify.

Citations are checked for format and existence, and later treatment is gathered so you can judge whether a case is still good law.

Ground.

Every answer points back to the opinion, statute or rule it came from — opened right inside the conversation.

Capabilities

A research associate that shows its work.

Case-law search

Search opinions, dockets, RECAP filings, oral-argument audio and judges, with exact-phrase and proximity queries.

Citation checks

Pull every citation from a brief and confirm format and existence, with links to the source.

Good-law check

See how later courts treated a case, with a clearly caveated verdict. A research aid — not a certified citator.

Citation network

Map who cites a case and what it cites, to find the authority around your authority.

Precedent check

Test a legal position against the case law. Lewis surfaces supporting and adverse authority side by side.

Read and mark up PDFs

Open filings in the conversation, annotate them together, fill forms and place signatures.

Coverage

What Lewis reads.

Case law

Millions of federal and state court opinions through CourtListener, queried live — plus dockets, RECAP filings, oral-argument audio and judge profiles.

Statutes, regulations & rules

  • United States Code and Code of Federal Regulations
  • Federal Rules of Evidence, Civil, Criminal and Appellate Procedure
  • U.S. Sentencing Guidelines
  • Florida and North Carolina statutes and jury instructions

More jurisdictions are being added.

Practice areas

Built for the way you practice.

Ask Lewis installs as a set of Claude plugins. Start with Core, then add the practice areas you need.

Core

Case-law research, citation verification, precedent and good-law checks, citation networks and the PDF viewer.

Litigation

Matter portfolio, deadlines and legal holds — plus claim charts, chronologies, deposition prep, privilege logs and brief drafting.

Counsel

Playbook-driven contract review, NDA triage, privacy compliance and risk assessment for in-house teams.

Intellectual property

Trademark clearance, freedom-to-operate triage, patentability screens, takedown notices and renewal tracking.

Legal clinics

Student onboarding, intake, deadline tracking, memo scaffolds and end-of-semester case handoff.

Law students

Study, not answers: Socratic drilling, case briefing, IRAC feedback and bar prep.

Pricing

Plans are coming soon.

Every plan will start with a free trial. Join the waitlist and we'll tell you when pricing is published.

Free trial at launch

Basic

[Price TBD]

[Who it’s for and what’s included]

Coming soon

Professional

[Price TBD]

[Who it’s for and what’s included]

Coming soon

Education

[Price TBD]

[For clinics and law students — details TBD]

Coming soon
Early access

Be first when Lewis opens.

Ask Lewis is in private alpha. Join the waitlist for early access and an invitation to the free trial.

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