Legal AI for civil-law practice

Provably diligent.

Constat is the practice platform where AI diligence is architecture, not promise: a citation that is not verified against its source cannot be rendered, every released advice carries a verification certificate, and the platform keeps watching the law after your advice goes out.

Request a demo See the three guarantees

EU-sovereign · no US processors in the chainBuilt for civil-law practice · live in the Netherlands

Our verification checker, as the lawyer sees it

Counsel-ratified rulesLawyer approval requiredVerified public authoritiesEU-region processingDutch civil law

The problem

17%

Up to one in three AI answers cites law that does not support the claim.

In Stanford's preregistered benchmark of leading AI legal research tools, 17–33% of answers contained hallucinated or misapplied authority (Magesh et al., Journal of Empirical Legal Studies, 2025). The industry's answer is checking tools that run afterwards. Constat inverts that: verification is the gate, not the afterthought.

The three guarantees

We can show you each one, live, in ninety seconds.

Citations cannot render unverified

Every reference is verified against its public source (legislation, case law, EU law) before it appears on screen or in an export. One gate covers both. An unverified citation is not flagged; it is technically impossible to display.

Architecture, not a post-hoc checker.

II.

A verification certificate with every advice

When advice is released, 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 immutable audit log.

Evidence you can hand to a client, or to your professional-indemnity insurer.

III.

The platform keeps watching after release

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.

No other platform does this. We checked.

How it works

From client intake to monitored advice.

Client intakeA secure public form opens the file — the client books a confirmed slot from the lawyer's real availability, and a limitation-risk radar checks the dates from day one.

→

ConsultationThe consultation is captured with consent first, producing a transcript and a grounded analysis.

→

Verified reportEvery citation in the report is verified against its source; the platform abstains rather than inventing authority.

→

Drafted documentsNotices, demand letters, memos and contracts are drafted from the report's verified authorities, on counsel-approved templates. The same gates apply: unverified citations cannot render, and nothing reaches a client without lawyer approval.

→

CertificateOn release, a verification certificate is issued and anchored to the audit chain — and the complete dossier, documents and certificate included, exports as one bundle into the firm's own document management system.

→

MonitoringAfter release, the cited law is re-checked continuously and the firm is alerted when it changes.

Deterministic where it matters

Deadlines are computed, never guessed.

Statutory terms such as limitation, complaint duties and procedural windows come from a deterministic engine. Every rule is signed off by counsel of record, and the statutory basis and full derivation are shown for every date. Dates extracted from documents reach the engine only after explicit lawyer confirmation.

Counsel-signed rules

Every deadline rule carries a recorded sign-off by counsel of record: auditable provenance, in code.

Limitation radar

Dates mentioned in an intake are checked against limitation and complaint-duty periods before anyone opens the file.

Dossier intelligence

Upload the file's documents — contracts, letters, exhibits. Text is extracted on-platform (originals never stored), dates are found deterministically, and the matter gets a derived overview of parties, timeline and obligations, every fact labelled as the client's assertion, never presented as law.

Feitenrelaas

Every matter carries a chronological fact record. Each entry names its source (intake, transcript, or the deadline engine) and diverging dates are flagged before anyone relies on them.

Sovereignty

European advice deserves European infrastructure.

ProcessingEU-owned, end to end

Language modelEuropean (Mistral), zero-data-retention, enforced in code

US processors in the chainNone

EncryptionPer-record envelope encryption, firm-held keys

Audit trailHash-chained, append-only

GDPR / DPIACompleted with counsel and DPO

Where we operate

Built for Dutch civil-law practice.

LiveNetherlands

Dutch civil law: contract, consumer, labor, tenancy, business and tort, with a counsel-ratified corpus and deadline rules.

What Constat does not claim

Constat provides technology that supports legal professionals. It does not provide legal advice, and no output constitutes legal advice or creates a lawyer-client relationship. All outputs are labelled, traceable and indicative, and remain subject to review by the responsible lawyer. Responsibility for the advice rests with the lawyer of record; Constat's role is to evidence the diligence exercised.