Every major legal research platform is a walled garden. If the authority that answers your question lives in a treatise, encyclopedia, or reporter the other one owns, you don't find it. You pay per silo, per year.
Searches Westlaw content. Doesn't cross into LexisNexis holdings. CoCounsel now routes through Anthropic's Claude via MCP — your firm needs to approve a new AI vendor before it works.
Searches Lexis content. Doesn't cross into Thomson Reuters holdings. Separate subscription from Westlaw. Most firms pay for both.
Clio acquired vLex for $1 billion. Clio users now search vLex's 110-country database. They don't get Prosser, Wright & Miller, or Collier without separate subscriptions.
Every time a court cites a statute, treatise section, regulation, or opinion, Marcella extracts that relationship from the public record. The result: a map of how courts actually applied authority, across every publisher, without subscribing to each one separately.
10 million+ judicial opinions. 50-state statutory codes. Federal regulations. Growing every day via automated ingestors.
CUAD, UCC, contract case law
USPTO, PTAB, Federal Circuit
USCIS, EOIR, Foreign Affairs Manual
Official Forms, UST guidance
NLRB, EEOC, DOL regulations
ULC acts, state probate statutes
USSG, criminal procedure
Mechanics liens, Miller Act, OSHA
Family court opinions, ULC family acts
SEC EDGAR, Delaware Chancery
FAR/DFARS, GAO protests, COFC
HUD, recording statutes, zoning
OCC, FDIC, Dodd-Frank
EPA, Clean Air/Water, CERCLA
IRC, IRS publications, Tax Court
Mineral rights, tribal codes
ABA Model Rules, 51 jurisdictions
Med-mal opinions, SSDI, WC boards
OFAC SDN, EAR/ITAR
CARB, SB 253/261, Paris Art. 6.4
NIST 800-171, CMMC assessment