CourtListener: The Practitioner's Guide to the Best Free Litigation Database

CourtListener is a free legal-research database run by the nonprofit Free Law Project. It holds more than nine million court opinions, mirrors federal court dockets through its RECAP archive, hosts the largest free collection of oral-argument audio on the internet, and will even check whether a citation actually exists — all at no cost. For a solo or small-firm litigator, it is the most useful tool most lawyers still underuse. Here is what each piece does, what it costs, and the honest limits before you rely on it.

What CourtListener is (and who is behind it)

Free Law Project is a nonprofit that describes its mission as "making the legal ecosystem more equitable and competitive." CourtListener is its flagship. That ownership matters: because a nonprofit runs it rather than a subscription vendor, the data is free and openly licensed — but you are getting the raw public record, cleaned up and searchable, not a polished commercial product with an editorial staff behind it.

The opinion database is the heart of it: more than nine million decisions from over 2,000 courts, which Free Law Project describes as more than 99% of all precedential case law published in the United States. Coverage spans the Supreme Court, all thirteen federal circuits, district and bankruptcy courts, every state's high and appellate courts, and several territorial and tribal courts. Full-text search is free and needs no login.

The pieces, and what each one costs

CourtListener is really six tools sharing one database:

RECAP: the free PACER alternative that isn't quite free

RECAP is the piece worth understanding in detail: it is where lawyers save the most money, and where the "free" label needs an asterisk.

PACER, the federal courts' electronic records system, charges $0.10 per page, caps any single document at $3.00 (the equivalent of 30 pages), and waives your bill entirely if you accrue $30 or less in a quarter. Those dimes add up fast across active matters.

RECAP — "Turning PACER Around Since 2009," per Free Law Project — is a browser extension for Chrome, Edge, Safari, and Firefox. Install it and use PACER normally: every document you buy is uploaded to a shared public archive, and whenever you open a docket, RECAP shows you a free copy of anything another user already contributed, so you never pay twice for the same filing.

The honest mechanics: RECAP does not reduce PACER's fee on a document nobody has bought yet — you still pay for the first pull. It just makes sure the profession pays for each document only once. In a widely litigated case, most of the docket is often already in the archive, which now holds tens of millions of documents. For a small firm watching a few federal matters, RECAP plus docket alerts can cut a real line item to near zero.

Docket alerts: track a case without the PACER bleed

Manually re-checking a docket for new filings is how PACER fees quietly balloon. CourtListener's docket alerts fix that: subscribe to a federal case and you get an email the moment a new entry posts, no repeated logins or per-page charges to see whether anything happened.

The alerts run off the courts' RSS feeds, so how fast and how completely they fire depends on the individual court — some publish full feeds, some partial, some none. The free tier covers 5 docket alerts, which expands to 15 once you install the RECAP extension; Free Law Project members get unlimited alerts.

Oral arguments and the judge database

Two features round out the litigator's kit. The oral-argument archive is the largest free collection of appellate argument audio anywhere — millions of minutes from the Supreme Court and the federal circuits that publish recordings, now with machine transcripts generated within minutes of each file appearing. If you want to hear how a panel actually pressed counsel on an issue you are briefing, it is there for free.

The judge database collects profiles, appointment history, and financial-disclosure records for thousands of state and federal judges. Paired with the opinions a judge has authored, it is a legitimate start on the oldest form of legal research there is: figuring out who you are in front of.

The citation-lookup API: an existence check for citations

CourtListener's citation-lookup API checks a citation against a corpus of more than 18 million citations and tells you whether it resolves to a real decision. Free Law Project built it, in its own words, as "a guardrail to help prevent hallucinated citations" — directly relevant to every firm now touching AI-drafted work. The broader REST API is free and open by default, with a free token raising the rate limits.

The limits matter. The lookup confirms a case exists; it does not confirm the case says what your brief claims, and it does not cover statutes, regulations, or law-review citations. Treat it as the first of several checks — existence, then support, then treatment — not the whole job. Our full workflow for verifying AI-generated citations walks through the other layers.

How lawyers actually use CourtListener

Strip away the feature list and three real workflows emerge.

• Existence-checking a citation. A brief lands on your desk citing a case you have never heard of. Search the opinion database or hit the citation API; if it does not resolve, you have caught a problem before it reached a judge. It is also a fast, free way to read the actual opinion when you are researching case law and just need the text.
• Tracking a docket without PACER bleed. Set a docket alert on the case that matters, install RECAP, and you monitor federal litigation by email — pulling most filings free from the archive and paying PACER only for the rare document nobody has bought.
• Opposition research on a judge. Before a hearing, read the judge's disclosures and pull a stack of their opinions on your issue. Not a personality profile, but real signal, and free.

The honest limits

CourtListener is excellent at what it does and silent about what it does not do. Know the gaps before you rely on it:

• No citator. This is the big one. It shows you the citation network — who cited whom — but gives no editorial good-law verdict, no red flag that a holding was overruled or criticized. Confirming a case is still good law means reading the citing cases yourself. If your practice lives on negative-treatment analysis, you still need a real citator, as we cover in the guide to how to Shepardize a case.
• No annotations or headnotes. No editorial summary layer, no headnote taxonomy, no practice guides. You read the opinion, not a curated digest of it.
• Thin trial-court coverage. The strength is precedential appellate law; trial-court dockets ride on RECAP contributions and RSS feeds, so a given case may be complete, partial, or absent.
• No support line. It is a nonprofit's public resource, not a product with an SLA — the trade you make for free and open data.

For what CourtListener does not cover — statutes, regulations, secondary sources — pair it with the rest of the free research stack — your bar's Fastcase benefit, Google Scholar for reading opinions — and keep a plan for the citator work it cannot do.

Where CaseRead fits — full disclosure

We are CourtListener users, not neutral observers, and we will say so plainly: CaseRead co-sources its case-law grounding from CourtListener, alongside OpenLaws for statutes and regulations. An open, nonprofit-maintained opinion corpus is exactly what a verified-citation product should be built on, which is why it is in our public proof points.

The difference is what we do with it. CourtListener's API tells you a case exists; CaseRead checks each citation in an answer (up to 25 per run) for whether it exists and supports the point, flags the ones that do not, and runs that search across your firm's own case files and the public law together.

That safety check is free to try. Paste any AI-drafted passage into the Hallucination Shield and each citation it finds (up to 25 per run) gets checked for existence and support — no signup, no charge. It is the two-minute habit that keeps a fabricated cite out of your filing, whether you found the case on CourtListener or anywhere else.

Frequently asked questions

Is CourtListener really free? Yes. CourtListener is run by Free Law Project, a nonprofit, and its opinion search, oral-argument archive, judge database, and API are free to use. The one place money can change hands is RECAP: viewing a court document already in the archive is free, but if you pull a document straight from PACER that nobody has contributed yet, you pay PACER's own fees for that download.

What is RECAP and how does it save on PACER fees? RECAP is a browser extension for Chrome, Edge, Safari, and Firefox. When you buy a document from PACER, it uploads a copy to a shared public archive; when a document you need is already in that archive, RECAP shows you a free copy instead of charging you again. It does not lower PACER's per-page fee, but it means the profession only pays for each document once.

Can CourtListener check whether a citation is real? Yes. CourtListener's free citation-lookup API checks citations against a corpus of more than 18 million citations and reports whether each one resolves to a real decision. Free Law Project built it as a guardrail against hallucinated citations. It confirms a case exists, not that it says what you claim, and it does not cover statutes or law-review citations, so treat it as an existence check, not a substitute for reading the opinion.

Does CourtListener tell you if a case is still good law? No. This is CourtListener's biggest limit. It shows you the citation network — which later cases cite the one you are reading — but it does not give an editorial good-law verdict the way Shepard's or KeyCite does. There is no red flag telling you a holding was overruled or criticized. You still have to read the citing cases yourself to confirm your authority is current.

How do CourtListener docket alerts work? Docket alerts email you when a federal case gets a new filing, so you can track litigation without repeatedly paying PACER to check. They run off the courts' RSS feeds, so coverage depends on the court. The free tier includes 5 docket alerts, which expands to 15 once you install the RECAP browser extension; Free Law Project members get unlimited alerts.

Who runs CourtListener? CourtListener is a project of Free Law Project, a nonprofit that describes its mission as making the legal ecosystem more equitable and competitive. The same organization builds RECAP, the Eyecite citation parser, and open legal datasets. Because it is a nonprofit rather than a vendor, the data is free and open, but there is no sales team, no service-level guarantee, and no editorial citator staff behind it.