Introduction

AI-powered legal research platform and API - search the US Code, CFR, federal and state case law, review contracts, resolve citations, and build legal tech products

What is Vaquill?

Vaquill is a legal research platform and case law API. Use it directly to search cases, review contracts, and manage citations. Or integrate the API into your own product to add legal research capabilities.

Case Law Research

Search federal and state case law - Supreme Court, Circuits, Districts, and state courts - with Boolean operators and citation lookup.

Statutes & Regulations

Search the US Code, CFR, and all 50 state statutes with amendment timelines and court interpretations.

Document Search

Upload documents and ask questions in plain English. Every answer is sourced with page-level citations.

Contract Review

Clause-by-clause analysis with severity ratings, redline suggestions, and Word Track Changes export.

Agent Mode

Autonomous AI research that searches, reads URLs, fetches files, and chains tools across multiple rounds.

Deep Research

Multi-hop iterative reasoning for cross-document analysis and comparative legal questions.

Citation Graph

Interactive precedent map - see who cited what and whether a case is still good law.

Legal Tools

NDA triage, compliance check, risk assessment, document compare, AI judge, and more.

Coverage

US Federal Law

United States Code, Code of Federal Regulations, the US Constitution, and federal case law from the Supreme Court through District Courts.

State Law

Statutory codes and constitutions for all 50 states, plus state appellate and supreme court opinions.

International (Optional)

Canadian federal and provincial case law and Indian Supreme Court / High Court decisions available when needed for cross-border work.

50+ File Formats

PDF, DOCX, scanned and image-only documents (OCR), spreadsheets, presentations, emails, archives.

Coverage is continuously expanding. For specific jurisdictional questions, see the relevant feature documentation or contact support.

US case law on Vaquill is powered by CourtListener, a service of the Free Law Project - a US 501(c)(3) non-profit. If Vaquill is useful to you, please consider donating to Free Law Project. See Data Sources & Attribution for the full list of upstream partners.

Build with the API

The case law API is designed for teams that need legal data as infrastructure. Search cases, resolve citations, and traverse the citation graph programmatically.

Legal Tech Platforms

Embed case law search into contract drafting, CLM, or practice management tools.

Enterprise Legal Teams

Build internal legal research tools for in-house counsel and compliance workflows.

Compliance & RegTech

Power automated regulatory compliance checks with case law data.

Legal Education

Build searchable case databases for law schools, bar prep, and training platforms.

See Authentication for API keys, Credits for pricing, and the API Reference for endpoints.

Getting Started

Use the Platform

1. Create an account

   Sign up at app.vaquill.ai. Every new account starts with a 7-day free trial of the full feature set; after that, the subscription is $99 / month.

2. Upload a document

   Drag and drop a file - or forward an email - into a matter. Supports 50+ file formats including scanned PDFs.

3. Ask a question

   Type a question in plain language. Every answer comes with page-level source citations you can click through to verify.

4. Run a Legal Tool

   Activate Contract Review, NDA Triage, Compliance Check, or any of the Legal Tools from the conversation bar.

Use the API

1. Get an API key

   Generate a key from your dashboard settings. See Authentication for details.

2. Make your first request

   Search for a case:

   curl -X POST https://api.vaquill.ai/api/v1/research/search \
     -H "Authorization: Bearer vq_key_..." \
     -H "Content-Type: application/json" \
     -d '{"query": "qualified immunity excessive force", "limit": 5}'
   
3. Explore the endpoints

   Browse the full API Reference for case search, citation resolution, statute lookup, and citation network traversal.

Frequently Asked

Is my data private?

Yes. Your matters, documents, and conversations are isolated to your organization at the database and search-index level. Documents are encrypted at rest and in transit. See Team Workspaces for organization-level access controls.

How does Vaquill prevent hallucinations?

Every AI response runs through claim-level verification against the actual cited sources before it reaches you. See Answer Verification for the details.

Can I use Vaquill for filings?

Vaquill is a research and drafting tool, not a substitute for legal judgment. Always verify cited authorities and run a precedent freshness check (see Citation Graph) before filing.

What's the difference between the platform and the API?

The platform is the full Vaquill app at app.vaquill.ai - chat, matters, legal tools, document management. The API exposes a subset of the platform’s capabilities (case search, citation resolution, statute lookup, ask-a-question) for product builders and enterprise teams to embed in their own tools.

How do I get help?

Email [e-mail] or join the community Slack.