CourtListener

Overview

CourtListener is a legal research service centered on U.S. court opinions, dockets, and filings. It is best suited to lawyers, researchers, journalists, and developers who need broad access to public legal materials. Its breadth is a major strength; users who need generous monitoring or API capacity should weigh the paid tiers against the free limits.

Founded in 2010 and built on open-source technology, CourtListener brings together opinions, oral arguments, judges, judicial financial records, and federal filings. Its RECAP Archive covers nearly every federal case and includes hundreds of millions of docket entries and tens of millions of legal documents. That makes the service useful for more than case-law lookup: it can also support research into federal litigation and court records.

Key features

Search and alerts

Case-law and docket search, citation tools, and coverage of federal and state courts make CourtListener a strong public starting point for U.S. legal research. Alerts can follow topics, people, companies, citations, and other searches. The free non-member tier allows five docket alerts and five daily RECAP search alerts, but unlimited daily opinion search alerts. That balance works for broad case-law monitoring and light docket tracking, not for users following many active matters.

Data access and AI integration

Free Law Project provides REST APIs, bulk data files, webhooks, database replication, and an MCP server. Developers can choose among several ways to work with CourtListener data; the trade-off is that API request limits depend on membership tier. The MCP server also lets Claude, ChatGPT, and other AI assistants access CourtListener data and APIs directly.

Support and security

Help documentation covers memberships and donations, data coverage, developer documentation, content removal, and direct contact support. Free Law Project’s vulnerability disclosure policy applies to CourtListener, its API, alerts, and RECAP extensions, and requests coordinated disclosure for up to 90 days. The policy says DNSSEC is not currently planned, a limitation security-conscious organizations may want to consider.

Pricing

The non-member tier is free, and complimentary EDU memberships are available to faculty, students, and researchers with a valid .edu email address. Qualifying U.S.-based nonprofit legal services organizations can receive free LSO memberships. Paid tiers raise alert and API allowances; the supplied prices show monthly and annual billing terms.

For occasional use, the free tier preserves unlimited daily opinion alerts but caps docket monitoring and RECAP searches. Tier 1 removes the docket-alert ceiling and adds real-time opinion alerts, while higher tiers mainly increase RECAP search and API capacity and add shop credits. The published membership allowances do not state seat counts or trial terms.

Platforms

CourtListener is available on the web. Its developer access includes APIs and bulk data, while the MCP server provides a route for compatible AI assistants to access its data and APIs.

Who it's for

CourtListener fits lawyers, journalists, academics, the public, researchers, and organizations seeking searchable U.S. court materials. Developers and teams building research workflows can use its APIs, bulk data, webhooks, database replication, and MCP server. It is less suited to users whose work depends on monitoring more docket matters or making more API requests than the free tier permits and who do not want a paid membership.

Pros and cons

• Pro: The archive combines opinions, oral arguments, judicial records, and federal filings, with particularly broad RECAP coverage.
• Pro: Search, citation tools, and alerts span both case law and dockets, including monitoring by topic, person, company, or citation.
• Pro: Multiple developer access options, including an MCP server, make the archive useful beyond the website.
• Con: The free tier limits docket alerts to five and daily RECAP searches to five, which can hinder active litigation monitoring.
• Con: API quotas are capped even on the highest described tier, so high-volume integrations need to account for request limits.
• Con: The vulnerability policy says DNSSEC is not currently planned, which may matter to organizations with specific security requirements.

Alternatives

Legal Research Software is a broader category directory for comparing legal research options.

• Indian Kanoon is worth considering for Android access or research into Indian legal materials; its free plan has a few Prism credits, 25 court copies per month, and two query alerts.
• RECAP is an alternative from the same nonprofit maker, with extension, iOS, and web platforms.
• AustLII offers free access to public legal materials and is a better fit for readers seeking that library.
• BAILII provides free access to its databases, but does not permit bulk downloading.
• CanLII is a free option for Canadian legal information; CanLII Search+ requires a free myCanLII account and has a daily usage limit.
• Docket Alarm has a free allowance of five weekly actions across searches, docket views, and document views, excluding government-purchased documents such as PACER filings.
• GovInfo is a free choice for official publications from all three branches of the U.S. federal government.
• HeinOnline is another legal research option.

Verdict

CourtListener is a strong choice for anyone who needs broad, searchable access to U.S. opinions and court records, especially researchers and developers who can make use of its substantial RECAP archive and data tools. Its principal drawback is that free docket and RECAP monitoring, along with API use, is capped; users with heavier workloads should compare the paid tiers or consider an alternative aligned with their jurisdiction and research needs.