Sources & methods
10,577,741 opinions from 2,202 U.S. courts; latest decision October 10, 2026.
What we add on top of the opinions
- Ranking. Relevance weighted by how often later courts cite an opinion and by court level (U.S. Supreme Court, courts of appeals, state supreme courts). Concurrences and dissents rank slightly below the majority, so the majority represents the case.
- Search syntax. Our own Terms & Connectors parser — Westlaw and Lexis connectors, order of operations, proximity, root expanders and field searches — plus automatic recognition of citations and case names.
- Bluebook citations. Reporter preference, court-and-year parentheticals, T6 abbreviations and party-name rules, and pin cites from star paging when you copy a passage.
- Citation analysis. 78 million citation links between opinions, the depth of each citing reference, the sentence where the case is cited, and 6.5 million explanatory parentheticals written by later courts.
- Court catalog. More than three thousand courts grouped by level, state and federal circuit for filtering.
- For AI. An MCP endpoint and a tool that checks whether every citation in a draft actually exists.
Sources
Opinions of U.S. courts are in the public domain. Opinion text and case data are compiled from public-domain court datasets, with historical cases from Harvard Law School's Caselaw Access Project; new opinions are added daily from the courts' own websites and the U.S. Government Publishing Office (GovInfo); citation analysis, ranking and citation formatting are our own. Links to original documents point to the issuing courts. None of these organizations endorses this site.
Limits
- Citing references and descriptions by later courts are not a citator: they do not tell you whether a case has been reversed, overruled or criticized.
- New opinions are added daily, but coverage is broad, not complete — some courts' newest opinions arrive only with the next full refresh. Not finding a case does not mean it does not exist.
- Older opinions recognized by OCR can contain text errors; quote from the court's original.
- Citations are generated automatically. Check your court's rules (parallel and public-domain citations) before filing.
- Not legal advice.