Legal AI for civil-law practice
Constat is the practice platform for Dutch civil-law firms where verification is architecture, not a promise. A citation that has not been checked against its source cannot appear on screen. Every released advice carries a certificate. And the platform keeps watching the law after your advice goes out.
The verification gate, as the lawyer sees it
An unverified reference is not flagged in red. It is never rendered.
The problem
17–33%
That figure comes from Stanford's preregistered benchmark of commercial legal research tools. The industry's answer has been checking tools that run after generation. Constat inverts the order: verification is the gate, not the review.
SourceMagesh et al., Journal of Empirical Legal Studies (2025)
Three guarantees
I
Every reference is checked against its public source — Dutch legislation, case law, EU law — before it appears on screen or in an export. An unverified citation is not flagged; it is technically impossible to display.
Architecture, not a post-hoc checker.
II
On release, Constat freezes the verification state and issues a certificate: every cited authority, its source, licence and good-law status at that moment, anchored to an append-only audit log.
Evidence for your client and your professional-indemnity insurer, with a plain-language cover page in the client's language.
III
Cited case law is re-checked against the citation graph after your advice ships. If an authority is later overruled or narrowed, the firm is alerted for the affected matter.
Advice that stays verified.
A secure public form opens the file and the client books a confirmed slot from the lawyer's real availability. A limitation radar checks the dates supplied at intake against limitation and complaint-duty periods before anyone opens the matter.
The consultation is recorded with consent captured first, producing a transcript and a grounded analysis tied to the file. The client's statements are labelled as assertions, never as findings.
Every citation in the report is verified against its public source. Where authority cannot be verified, the platform abstains and says so rather than inventing something plausible.
Notices, demand letters, memoranda and contracts are drafted from the report's verified authorities on counsel-approved templates. The same gates apply, and nothing reaches a client without lawyer approval.
On release a verification certificate is issued and anchored to the audit chain. The complete dossier — documents and certificate included — exports as one bundle into the firm's own document management system.
After release the cited law is re-checked continuously, and the firm is alerted when an authority in a specific matter is overruled or narrowed.
Deterministic where it matters
Limitation periods, complaint duties and procedural windows come from a deterministic engine, not a language model. Every rule carries a recorded sign-off by counsel of record, and every date shows its statutory basis and full derivation. Dates read from documents reach the engine only after the lawyer confirms them.
Twenty minutes on the live platform: a citation that cannot render unverified, a certificate issued in front of you, and the monitoring that never sleeps.
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