CourtListener
A free, public database of US case law maintained by the Free Law Project.
CourtListener is a free, publicly accessible corpus of US case law, dockets, and opinions maintained by the nonprofit Free Law Project. It is widely used as an open alternative to subscription research services for reading opinions and confirming that a cited case exists.
Draftiro validates every case citation the AI emits against CourtListener and flags unverified or missing cites. It is not a full citator — read the opinion and check subsequent history (Shepardize) before relying on a case.