A quarter of the citations in filed briefs are Westlaw or Lexis ids. We list them, we do not guess.Coverage ›

Check every citation
before you file

Paste a draft. Every case citation is checked against 10 million opinions in seconds. A citation checker for AI-drafted and hand-drafted briefs alike.

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Processed in memory, then discarded. Only counts are logged.

Built on open registers

CourtListener
10.1 M cases
Caselaw Access Project
Harvard
govinfo
13 circuits
SCDB
Supreme Court
RECAP
141 filed briefs

What it checks, and how often it is wrong

Coverage
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Register has Bostock v. Clayton County at 590 U.S. 644. Check the volume.

Existence

89% of invented cases caught.

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Quoted language not in the opinion. 3 of 9 content words absent.

Quotation

14 of 15 invented quotes caught.

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Passage found that states this. Confidence 0.97.

Support

7 in 10 good citations confirmed. A review queue, not a verdict.

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11 Westlaw / Lexis ids. Listed, not resolved.

Unverifiable ids

A quarter of citations. Listed, never flagged.

89%

invented cases caught

14 / 15

invented quotes caught

7 in 10

good citations confirmed

0%

hallucination rate. The default check uses no language model.

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"Zero fabricated cases in 7,067 citations from filed briefs. 21% in the LLM drafts."
Measured141 briefs, 29 districts, 300 LLM paragraphs. September 2026.
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