We built this review from CourtListener's and Free Law Project's own documentation and the Library of Congress's free case law research guide. Everything was checked October 15, 2026.
Disclosure: Some listings on AI Tools For Law may be sponsored or include affiliate or referral links. Paid placements are always labeled "Sponsored," and payment never changes our verdicts. Free Law Project hasn't paid for this review. Nothing here is legal advice.
What does CourtListener actually do?#
CourtListener is the public-facing research site of Free Law Project, which describes its mission as free, public and permanent access to primary legal materials. For lawyers, the useful parts are:
- Case-law search across federal and state courts, with an "Authorities" list (what an opinion cites) and "Cited By" links (later opinions citing it, sorted by how often they're cited).
- The RECAP Archive, which Free Law Project calls the biggest open collection of federal court data online: hundreds of millions of docket entries, every unsealed federal case, and millions of documents.
- Docket alerts, so you hear when something is filed in a federal case you're watching. Per Free Law Project's help pages, you get 5 free alerts, 10 more with the RECAP extension, and more as a member. Some real-time alerts arrive only at the end of the day.
- Judges and financial disclosures, plus oral argument audio.
What this means for you: For a quick look at an opinion, a federal docket or who's citing a case, CourtListener often gets you there without logging in to anything paid.
How does RECAP work, and what's missing?#
PACER, the federal courts' electronic records system, charges per page. RECAP is Free Law Project's workaround. Per its coverage page, documents arrive several ways:
- The RECAP browser extension, which Free Law Project says around 30,000 people use. When you buy a document on PACER, the extension sends a copy to the archive. Next time anyone needs it, it's free.
- @recap.email, which adds documents from PACER notification emails.
- Scrapers that watch "special" cases, such as ones with active docket alerts.
- Free PACER fetch APIs that organizations use to pull cases and documents.
The catch follows from the design: a document is in RECAP only if someone contributed it or Free Law Project gathered it. Free Law Project itself says there's no easy answer to "what's in RECAP?" If a document isn't there, CourtListener links you to buy it on PACER.
How much does CourtListener cost?#
The website is free. Searching doesn't require an account; alerts do.
Developer services are available, in Free Law Project's words, as a membership benefit and through commercial agreements. No price list is posted on the API page, so ask Free Law Project. The options, per its API help page:
CourtListener developer services
Replication
Instant-updating replica of the PostgreSQL database, queried with SQL
Source: courtlistener.com/help/api
REST APIs
Search, alerts, citation verification and PACER crawling
Source: courtlistener.com/help/api
Bulk data
CSV files of case law, people and financial disclosures
Source: courtlistener.com/help/api
MCP server
Lets AI assistants query CourtListener data and APIs directly
Source: courtlistener.com/help/api
Webhooks push events to you as they happen. Free Law Project rates the REST APIs as having a "longer" learning curve and webhooks as "complex" to set up.
Where CourtListener falls short#
- It isn't a citator. "Cited By" shows you which opinions cite a case, not whether a case is still good law. The Library of Congress's research guide makes the same point: helpful for getting a feel for treatment, not as authoritative as subscription options.
- No editorial layer. No headnotes, key numbers, annotations or practice guides.
- No AI answers. You read the opinions yourself, though the MCP server lets you connect an AI assistant to the data if you're building that.
- RECAP is only as complete as its contributions.
Who uses the API, and why it matters#
Free Law Project says its data services serve researchers, journalists and organizations of all kinds. If you're evaluating an AI research product, it's fair to ask where its case law comes from. If you're a firm building internal tools, the citation verification API is a cheap way to check whether citations in an AI-drafted document actually exist. What this means for you: it catches cases an AI made up (often called hallucinations). It won't tell you whether a real case still supports your point. API access is a membership benefit; confirm current terms with Free Law Project.
What do people say about CourtListener?#
We looked at how researchers and practitioners describe it. Most treat it as a valuable free first stop for opinions and federal dockets, and the RECAP extension is widely recommended. The common caveats are that RECAP coverage is incomplete, so PACER remains the place to confirm a docket is complete, and that "Cited By" is a starting point rather than a substitute for a subscription citator.
Pros and cons#
Pros
- Free, run by a non-profit.
- RECAP for free federal dockets and documents.
- Docket alerts.
- Serious developer APIs, including citation verification and an MCP server.
Cons
- Not a citator.
- No headnotes or editorial content.
- RECAP coverage is uneven by design.
- API pricing not published.
How does CourtListener compare?#
Descrybe and Midpage are AI-assisted case-law research tools worth comparing if you want summaries and natural-language search. Lexis+ with Protégé is the full commercial stack, with Shepard's and treatises. Many firms use CourtListener alongside one of them.
Who should use CourtListener?#
FAQ#
Is CourtListener really free?#
Yes. The website is free to use. Developer APIs and data services are offered through Free Law Project memberships and commercial agreements.
Who runs CourtListener?#
Free Law Project, a 501(c)(3) non-profit founded in 2010.
Does CourtListener have every PACER document?#
No. RECAP has documents contributed through its extension and email system or gathered by Free Law Project. If a document isn't there, CourtListener links you to PACER to buy it.
Can CourtListener replace Westlaw or Lexis?#
Not for checking whether a case is still good law. Its "Cited By" feature is useful, but the Library of Congress notes it isn't as authoritative as subscription citators.
Can I connect an AI assistant to CourtListener?#
Yes. Free Law Project offers an MCP server that lets AI assistants access CourtListener data and APIs directly.
Is any of this sponsored?#
No. If that changes, the listing will be labeled "Sponsored," and payment won't change the verdict.
Sources (all accessed 2026-10-15)#
- CourtListener legal APIs and data: https://www.courtlistener.com/help/api/
- CourtListener RECAP coverage: https://www.courtlistener.com/help/coverage/recap/
- Free Law Project, About: https://free.law/about/
- Library of Congress, Free Case Law research guide (CourtListener and Caselaw Access Project): https://guides.loc.gov/free-case-law/courtlistener-and-caselaw-access-project
AI Tools For Law is not a law firm and doesn't provide legal advice. Using this site doesn't create an attorney-client relationship.
Alternatives to CourtListener#
Legal Research
Descrybe
Low-cost US primary-law research with its own citator (Cytator); a standalone platform or a Legal Engine that plugs into ChatGPT, Claude, Copilot and Perplexity.
Best forBudget-conscious solos and small firms, and lawyers wanting grounded citations inside the AI assistant they already use.
Legal Research
Midpage
Self-serve AI legal research: case law with AI research tools, an AI citator, plugins and agentic PACER access.
Best forSolo and small-firm litigators wanting affordable, self-serve AI case law research.
Legal Research
Lexis+ with Protégé
LexisNexis' AI research and drafting platform (formerly Lexis+ AI), grounded in Lexis content with Shepard's Verify, Vault, Workrooms, and agent skills.
Best forFirms already on Lexis+, litigators who value Shepard's citation checks, and firms wanting AI over their document management system.
How we reviewed
Researched from vendor documentation, pricing pages and user sentiment. Prices and details were last checked on . Sources are cited inline next to each claim and listed in the Sources section above.
How we review · Editorial independence and disclosure · Corrections: hello@aitoolsforlaw.ai