Hudson Corpus

Grounded legal research, with the citation built in.

One assistant over the Iowa Caselaw, Code, Administrative Code & Court Rules — every answer traced to the currently-effective text, every citation verified before you see it.

Start researching See the features

Hudson Corpus

Overview

Research that shows its work.

Hudson Corpus is one research surface over the Iowa Caselaw, Code, Administrative Code & Court Rules — 123,548 documents, retrieved, quoted, and cited by an assistant that cannot answer from memory. Ask in plain English or by citation number; every claim comes back attached to the provision or opinion it came from.

The difference is what happens before you see the answer. Retrieval runs against the human-reviewed text, a deterministic pass checks every quote and citation against its source, and anything superseded or overruled is flagged rather than quietly served. No support in the record, no answer.

Caselaw: 76,796; Decisions
Code: 27,869; Sections
Administrative Code: 17,690; Rules
Court Rules: 1,193; Rules

Features

One workspace for the whole record.

Browse, read, search, and ask — four views of the same corpus, so a question that starts as a hunch ends on the page that governs it.

See the developer tools

Ask in plain English. Get the citation.

The assistant shows its work as it goes — what it searched, which sections it read, and how many citations and quotations survived verification — then answers from that record and nothing else.

Every step of the research run, in the open
Quotes and citations checked before you see them
Follow any citation straight to the text

Under the hood

Why the answers hold up.

Grounded retrieval

Answers are built from the retrieved, human-reviewed text — not the model's memory. No support, no answer.

Citation verification

A deterministic check confirms every quote and citation against the source before the answer reaches you.

Currency tracking

Amendments and editions over time, with flags when a provision or holding has been superseded or overruled.

Real citations

Citation, effective date, and enacting session law on every provision, linked to the official publication.

MCP & API

Use it in the browser, or wire the corpus into Claude Desktop and your own tools over a production MCP endpoint.

Built for trust

Sourced from the official record and clearly scoped — a research tool that shows its work, not a black box.

Use cases

Where it fits in practice.

The same corpus, reached for in six different moments of a working week.

Litigation

Check the brief before it is filed.

Every citation in a draft validated against the corpus and every quotation checked verbatim against its source — the pass you would do by hand, done in one.

Advisory work

Answer the client with the text in force.

Provisions carry their effective date and enacting session law, and a version that is no longer the operative one says so before you rely on it.

Agency practice

The rule beside the statute it implements.

The Administrative Code sits in the same library as the Code, with the links between statute and rule mapped rather than left for you to chase.

Appellate research

Follow the authority, not a summary.

Search by issue or by citation, read the opinion itself, and see negative-treatment flags on decisions the citation graph says have moved.

Solos & small firms

A research department that fits in a tab.

No seat minimum, no per-search meter, and nothing to learn beyond asking the question the way you would ask a colleague.

Building with AI

The same corpus, inside your own tools.

Grounded retrieval behind a production MCP endpoint and an email address — read-only, keyed, and stamped with its source and as-of date.

Resources

What we learn, we publish.

The corpus is also a research instrument. When it answers a question about Iowa law that nobody has answered from the whole record before, we write it up — numbers frozen, methodology on the page.

All research & data

Data brief 001

The Most-Cited Cases in Iowa

The fifty decisions Iowa's appellate courts cite most, counted from every citation in the corpus — a list of workhorse standards, not landmarks, with the full table and method on the page.

Read the brief

Series

Data briefs

One question per brief, answered from the full record and frozen when published: which cases do the work, what changes, who regulates.

See the series

Writing

Articles & analysis

Our writing on grounded retrieval, citation verification, and where legal AI goes wrong — and what we do about it.

Read the articles

For developers

The MCP endpoint

Ten read-only tools over this corpus — citation lookup, hybrid search, version history, brief auditing — for Claude and any MCP client.

See the tools

Pricing

One product. Terms you can plan around.

Every plan includes the full corpus, unlimited cited research, the citator's negative-treatment flags, the MCP connector, and the email assistant. Firm adds brief cite-check uploads, seats, and an org console.

7-day free trial