AI Legal Research & Case Law Search for US Attorneys | Vaquill

Every layer of US primary law in one searchable corpus. The Constitution, the US Code, the CFR, the Federal Rules of Procedure (FRCP, FRCrP, FRE, FRAP, FRBP), all 50 state statute codes, state constitutions, state court rules, and every Executive Order, Proclamation, and Presidential Memo since 2015, refreshed daily, plus millions of US federal and state court opinions powered by CourtListener (Free Law Project non-profit). Every section ships with citation, full text, and downloadable PDF / DOCX / HTML mirrors.

• AI research across opinions (via CourtListener / Free Law Project), statutes, regulations, the Constitution, federal and state rules, and Executive Orders in one query
• Boolean keyword search across the entire US primary-law corpus with section-level results
• Per-state scoping: ask about Texas, California, New York, or any other state and get state-specific answers
• Multi-format mirrors for every section: HTML, plain text, official PDF, and DOCX where available

Powered by CourtListener (Free Law Project, a US 501(c)(3) non-profit). Search millions of US federal and state court opinions, SCOTUS, all circuits, district courts, and state appellate courts. Vaquill combines the open CourtListener corpus with AI-powered answers, boolean keyword search, and interactive citation graphs.

• US case law sourced from CourtListener (Free Law Project), combined with our AI, statute corpus, and citation graph
• AI research: ask a legal question, get a grounded answer with cited opinions
• Boolean keyword search with AND/OR/NOT, proximity, wildcards, and court filters
• Citation graph: see which cases cite a case, how (followed, distinguished, overruled)
• MCP server for Claude, Cursor, and VS Code: ask legal questions and get cited answers without leaving your editor

Go beyond your indexed corpus. Deep web research reads live web pages, fetches PDFs, and synthesizes information from any URL, useful for regulatory guidance, agency opinions, law firm memos, and news.

• Reads and summarizes any web page, PDF, or public document from a URL
• Synthesizes information from multiple web sources into a single answer
• Combines web research with your case law and statute results in one thread
• Useful for SEC filings, agency guidance documents, law review articles

Every AI response is automatically fact-checked claim-by-claim against your actual source documents, not the open web. Built for the post-Mata v. Avianca world where sanctions for fabricated citations are real.

• 4-layer verification: exact text match, citation check, meaning analysis, and AI cross-check
• Confidence scores per claim (verified / partial / unverified)
• Catches fabricated citations, wrong numbers, and missing qualifiers
• Verification badge on every response

Upload contracts, briefs, pleadings, or any legal document and have a conversation with it. Get cited answers with exact page numbers and highlighted passages from your own files.

• Ingest thousands of documents per matter (1,300+ pages in ~3 minutes)
• Every answer links back to the exact source text with page numbers
• Ask follow-up questions with full conversational context
• Deep Mode for complex, multi-issue analysis

Autonomous AI research that decides which tools to use. Agent Mode searches statutes, cases, reads URLs, fetches files, and chains tools across up to 5 iterations to answer complex legal questions.

• Autonomous tool selection, AI picks the right research strategy
• Reads web pages, PDFs, Office docs, and images with OCR from any URL
• Searches across USC, CFR, and millions of court cases in a single query
• Up to 5 iterations with 3 tool calls each for deep, multi-step research

Purpose-built AI tools for the work solo attorneys and small firms do every day. Contract review, NDA triage, risk assessment, compliance checks, and a customized feed to track new opinions and keywords in your practice areas.

• Contract Review: clause-by-clause analysis with GREEN/YELLOW/RED severity flags
• NDA Triage: 10-point screening with routing recommendations
• Risk Assessment: 5x5 severity-by-likelihood matrix (scores 1-25)
• Compliance Check: CCPA, GDPR, HIPAA, and 8 more regulatory frameworks
• Customized Feed: track keywords, courts, and practice areas, get notified when new opinions match

Draft legal documents from templates or plain-language instructions. Legal notices, NDAs, employment contracts, and more, with jurisdiction-aware clauses and export to DOCX.

• Template library: legal notices, agreements, contracts, and more
• AI generates jurisdiction-aware clauses and formatting
• Edit, refine, and iterate on drafts in real time
• Export to DOCX, PDF, or share via link

Automatically extract events and dates from legal documents and organize them into interactive, exportable timelines for deposition prep, trial, deal due diligence, and internal investigations.

• Date extraction from unstructured text
• Event sequencing with source attribution
• Visual timeline and structured table views
• Manual editing and export capabilities

Redline two documents and export a real Word file with native Microsoft Track Changes that opposing counsel cannot tell from Litera or Draftable output. PDF-to-DOCX cross-format compare included.

• Native Word Track Changes export (real <w:ins>/<w:del> revisions, not images or PDF overlays)
• DOCX-to-DOCX, PDF-to-PDF, and cross-format DOCX-to-PDF compare in one tool
• AI Change Summary: one-paragraph plain-English read on what substantively changed
• Tunables for case, whitespace, numbering, formatting, tables, footnotes (Litera-style profiles)

Spreadsheet-style review where rows are your documents and columns are the questions you want answered from each one. Run extraction across 200+ contracts in parallel and get a sortable, citation-grounded grid.

• Bulk upload up to 200 documents (PDF, DOCX, TXT, XLSX) with OCR on scanned PDFs
• Custom free-text columns or pre-built templates (NDA, MSA, lease abstraction, employment, IP)
• Every cell is grounded in a source quote with page and paragraph citations
• Export to CSV, XLSX, or PDF; filter, sort, and comment with co-counsel

Chain Vaquill steps into repeatable, multi-step pipelines: pick documents, search case law, extract a chronology, run a matrix, draft a memo, verify citations, export DOCX. Start from a template or build your own in a visual canvas. Or describe what you want in plain English and we generate the workflow.

• 8 starter templates: Quick Case-Law Memo, Demand-Letter Skeleton, MSA Risk Score, NDA Bulk Review, Document Triage, Daily Citation Audit, Statute Cite Check, Summarize Each Document
• Custom builder with 23 step types across 8 categories (retrieval, extraction, analysis, verification, drafting, routing, output, document I/O)
• Natural-language generation: type intent, get a working workflow you can review before running
• Versioned snapshots, branching, loop-over-documents, Test Run, cooperative cancel, full per-step audit log

Plug Vaquill into Claude Desktop, Claude Code, Cursor, VS Code, and Windsurf via MCP. Get AI legal research, US case law, and US federal law directly in your AI editor, no context-switching.

• Vaquill MCP: AI answers, boolean search, citation graphs, and statute lookup
• US case law search: 8M+ federal and state opinions accessible from Claude or Cursor
• US Federal Law via MCP: search USC and CFR sections directly from Claude
• One install (pip install vaquill-mcp), works across all MCP-compatible tools

Build on top of Vaquill. REST APIs for AI research (opinions + federal + state law), boolean search, citation graphs, and statute lookup. Already indexed, already hosted, skip the search infrastructure.

• AI Judgment Answers API: ask a question, get a cited answer with verification scores
• Boolean Search API: search 31M+ cases and 1.6M+ statute sections (USC + CFR + 50 state codes)
• Citation Graph API: full citation network with treatment types
• Statutes API: USC, CFR, and state codes full text, amendments, and PDF URLs, with per-state scoping

AI that learns your jurisdiction, practice area, citation preferences, and research context across sessions. Fully opt-in with complete privacy controls.

• Auto-extracts jurisdiction, practice area, and citation preferences from conversations
• Silent personalization, better answers without repeating yourself
• Up to 1,000 memories per user, 5 most relevant used per query
• Full privacy controls: opt-in, per-user isolation, delete anytime

Federal core

Constitution, US Code, CFR, FRCP, FRE, FRAP, FRBP

All 50 states

State statute codes, constitutions, and court rules

Executive branch

Every Executive Order, Proclamation, and Memo, refreshed daily

Ask (US case law + statutes)

POST /api/v1/ask with countryCode: "US" and optional usState. Get an AI answer grounded in 8M+ US opinions (CourtListener / Free Law Project), USC/CFR, and the statute code of any of the 50 states, with inline citations, PDF URLs, and verification. Streaming variant at /api/v1/ask/stream.

US Primary Law Search

POST /api/v1/statutes/search, GET /section/{id}, GET /section/{id}/body. Search and retrieve any provision of US primary law (Constitution, USC, CFR, Federal Rules, all 50 state codes, state constitutions, state court rules, and Executive Orders) with full text, PDF/DOCX/HTML mirrors, and cross-references. Filter by state with the `state` parameter.

MCP Server

Both endpoints above available via Model Context Protocol. Plug Vaquill into Claude Desktop, Claude Code, Cursor, VS Code, and Windsurf, no HTTP code needed.

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All Features Included

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One plan, every feature, scales per seat.

$99/user/month

Per-seat scaling

• Never cite bad law again. SCOTUS, all federal circuits, all state appellate courts, with treatment flags (overruled, distinguished, criticized) on every authority.
• Every US statute, refreshed daily. 1.6M+ sections across US Code, CFR, Federal Rules of Procedure, and all 50 state codes, plus every Executive Order, Proclamation, and Presidential Memo since 2015.
• Agentic research with persistent Memory and teachable Skills. Multi-step legal reasoning that remembers your matters and learns your firm’s playbook.
• Read entire deal rooms in minutes. Upload pleadings, due-diligence dumps, or contracts and chat across the whole set.
• Redline with real Word Track Changes. Compare any two documents (DOCX or PDF) and export a native DOCX that opposing counsel cannot tell from Litera or Draftable output.
• Document Matrix across hundreds of contracts. Spreadsheet-style review where rows are documents and columns are the questions you want answered, every cell grounded in a source quote.
• Stay in Word. Draft, redline, and cite-check contracts and opinions inside Microsoft Word, Outlook, and Google Docs.
• Skip the 3-hour chronology slog. Auto-built timelines across every document in your matter.
• Email a doc, get a cited answer back. Forward to your matter inbox and ask anything in the same thread.
• Bots in every channel. Native Slack + Google Drive, plus API + MCP for MS Teams, Claude, Cursor, VS Code. WhatsApp / Telegram / Discord / Zoho CRM available via API.
• Multi-org workspaces with role-based access (RBAC), SSO / SAML, and audit logs.

Talk to Sales

• Deploy in your own cloud (VPC), on-premises, or air-gapped
• White-label / co-brand: your domain, your colors, your logo
• Train Vaquill on your firm corpus, templates, and house style
• Advanced SSO with SAML + SCIM directory provisioning
• Single-tenant dedicated infrastructure
• Volume contracts for 50+ seats with custom pricing
• Dedicated customer success manager + named engineer
• Audit logs, BAA / DPA, and custom data residency (US, EU, IN, AU)
• 99.95% SLA with priority response and quarterly business reviews

30-min call with the founder. Custom proposal within 48 hours.

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FOUNDATION

Case law, document management, and AI research across jurisdictions

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Q3 2026

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Common law jurisdictions with English-language courts

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Australia · More

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Scaling across major common law markets