Legal databases in 🇺🇸 United States

5 databases covering United States, across 1 practice area.

General practice5

CourtListener

FreeUnited States

Free access to millions of legal opinions from federal and state courts, plus oral argument recordings, judge biographical data, and the RECAP Archive of federal court filings — maintained by the nonprofit Free Law Project, covering over 99% of published precedential U.S. case law from 2,000+ courts.

case_law8,313,056 documents

LawDiver

FreeUnited States

Free U.S. primary-law database covering 10,000,000+ court opinions — the U.S. Supreme Court, all federal circuit and district courts, and the appellate and supreme courts of all 50 states and D.C. — plus 60,000 current U.S. Code sections, over 1.9 million state-statute sections across all 50 states and D.C., 1,300+ U.S. treaties, and 8,000+ pattern jury instructions. Positions itself as a free alternative to Westlaw/Lexis for primary law specifically; it does not include secondary materials like treatises or practice guides. Its standout feature is GoodLaw, a citator built over a citation graph of about 100 million resolved opinion-to-opinion edges (190 million in-text citations) that flags whether a case has been overruled, vacated, or questioned — the kind of good-law check that distinguishes it from a pure full-text case search. A companion CiteCheck tool verifies one citation or a whole uploaded brief (up to 50 citations at once) against the corpus, flags unsupported or miscited authorities, and suggests corrected Bluebook form. Separate modules add administrative-law material beyond ordinary case law: IRS guidance (~59,000 authorities, each with its own good-law status), immigration decisions (~180,000 BIA/AAO/OCAHO authorities, plus a visa-bulletin lookup), and trademark records (3.2 million+ USPTO applications, ~64,000 TTAB proceedings, TMEP/TBMP). Tax Court, Board of Tax Appeals, and TTAB *opinions* specifically are already counted in the 10,000,000+ court-opinion figure above, not additional to it — only the administrative-authority and application records in these modules are extra. Web search requires no account or login. The REST API and MCP connectors (separate endpoints for caselaw, tax, trademark, and immigration) need a free API key. Caselaw and tax connectors are listed directly in Claude's and ChatGPT's own connector directories; trademark and immigration connect via a custom MCP URL or a Custom GPT Action. Also works with Cursor, Claude Code, and Perplexity. Everything — search, API, MCP, and CiteCheck — is free during the company's current rollout; bulk data licensing (full corpus, citation graph, embeddings) is offered separately for teams building their own products on top of it.

legislationcase_law11,960,000 documents

Midpage

Paid, free trial availableUnited States

AI-powered U.S. legal research and drafting platform with full case law coverage — all federal appellate and district courts (including unpublished opinions), all 50 states, and D.C., plus select state trial court data. 16,000,000+ opinions tracked, new cases appearing within hours of publication. Also covers federal and state statutes, regulations, and agency guidance. An AI-powered citator classifies citing cases as Negative, Caution, or Neutral with plain-language explanations rather than just symbols. Proposition Search finds case language matching a specific legal argument, with an Add Column feature to refine results by asking follow-up questions against them. Also supports brief drafting, cite-checking, and on-demand PACER docket retrieval for federal cases — docket sheets, procedural history, counsel information, and filings — with every AI response hyperlinked to the underlying case. Professional plan is $100/month (unlimited AI research, no API access), Law Student plan $25/month with proof of current enrollment; both start with a 2-week free trial, no sales call required. API access for developers is a separate, unpublished-price track.

legislationcase_law16,000,000 documents

OpenLaws

PaidUnited States

U.S. federal and state legislation, structured and kept current across all 50 states, D.C., and Puerto Rico. 100% coverage of the U.S. Code and Code of Federal Regulations. 100% coverage of state statutes and codes. 99% coverage of state regulations and administrative codes. 4,554,349 sections of statutes, regulations, and constitutions tracked and regularly updated, drawn from 163 authoritative government sources.

legislation

Vaquill AI

PaidUnited States

Structured, citation-linked access to United States primary law — federal and all 50 states, D.C., and Puerto Rico. 5,000,000+ sections covering the U.S. Code (60,170 sections), Code of Federal Regulations (222,430 sections), Federal Register rules (196,237), and state statutes (1.93M+ sections), plus Statutes at Large as enacted from 1789 to 2026 (429,297 entries), 31 years of CFR annual editions since 1996, 97,025 federal agency guidance documents from 53 named sources across 26 agencies, and 100,920 federal administrative adjudications from seven tribunals. Point-in-time lookups reconstruct any section's text as of a past date, with Bluebook and state-specific citation resolution (e.g., 42 U.S.C. § 1983, Cal. Civ. Code § 1946.2). CFR data is refreshed daily, U.S. Code weekly, and state regulations monthly.

legislation