Clearbrief can't hallucinate. That's the whole pitch — and it's a good one.

Clearbrief can't hallucinate. That's the whole pitch — and it's a good one. Clearbrief uses semantic analysis to verify every citation in your brief against actual source documents. It doesn't generate text, so it literally cannot make up cases. KeyCite is the established citation verification service built into Westlaw, checking whether your cited cases are still good law. They're not competitors — they're complements.

Here's the real play: KeyCite tells you if a case has been overruled. Clearbrief tells you if your brief actually says what the source says. In an era where judges are sanctioning attorneys for AI-hallucinated citations, you need both layers of verification.

How They Actually Work

Clearbrief reads your brief in Microsoft Word, identifies every factual claim and citation, then runs semantic analysis against the actual source documents to verify accuracy. It highlights unsupported claims, flags mischaracterized holdings, and builds an audit trail showing exactly which document supports which statement. KeyCite checks the current status of cited cases — whether they've been overruled, distinguished, criticized, or affirmed — and flags negative treatment. Clearbrief checks what you're saying about the law; KeyCite checks whether the law you're citing is still valid.

The Hallucination Problem

This is why Clearbrief exists. Generative AI tools like ChatGPT and even legal-specific AI can fabricate case citations that look real but don't exist. Clearbrief's non-generative approach means it physically cannot hallucinate — it only analyzes documents you provide. KeyCite can verify that a real case hasn't been overruled, but it can't catch a fabricated citation that was never a real case. Clearbrief catches fake citations. KeyCite validates real ones. You need both checks in a 2026 AI-assisted workflow.

Workflow and Integration

Clearbrief operates inside Microsoft Word as an add-in — you write your brief, click analyze, and it highlights issues inline. No switching platforms, no copy-pasting into a separate tool. KeyCite lives inside Westlaw, which means you either check citations while researching or use the Westlaw Edge integration in your drafting workflow. Clearbrief's Word-native approach means lower friction for the actual moment you're drafting and revising.

Audit Trail and Court Compliance

Multiple federal courts now require attorneys to certify that AI-generated content has been verified. Clearbrief generates a complete audit trail — a document showing every claim in your brief, the source it's verified against, and the confidence level of the match. This audit trail can be attached to court filings as proof of human verification. KeyCite doesn't generate this kind of filing-ready verification document. For firms navigating AI disclosure requirements across 94+ federal districts, Clearbrief's audit trail is a compliance tool, not just a research tool.

Cost and Value Proposition

KeyCite comes bundled with Westlaw subscriptions — if you're already paying for Westlaw, you have it. Clearbrief is a separate subscription that adds cost on top of your existing research platform. The value case for Clearbrief is risk mitigation: one sanctioned brief costs more than years of Clearbrief subscriptions. For litigation-heavy firms where brief accuracy is existential, the cost is trivial relative to the malpractice exposure it prevents.

The Bottom Line: Don't pick between them — use KeyCite to verify your cases are still good law, then use Clearbrief to verify your brief accurately represents what those cases say.