What is LEGAION and how is it different from Harvey AI?

LEGAION is the world's #1 Legal Intelligence Platform with the only built-in Verifier Engine™. Unlike Harvey AI which generates responses without verification and can hallucinate, LEGAION audits every single claim with citations from case law, statutes, and regulatory databases. This means you get accurate, verifiable legal insights with zero AI hallucinations - critical for malpractice prevention.

Is LEGAION better than Harvey AI for contract review?

LEGAION offers significant advantages over Harvey AI for contract review. Our Verifier Engine™ cross-references every clause against legal databases and provides source citations. While Harvey AI generates plausible-sounding analysis that may contain errors, LEGAION verifies each finding with actual legal authority. AmLaw 100 firms report 40% fewer review cycles after switching from Harvey AI to LEGAION.

How does LEGAION compare to CoCounsel by Thomson Reuters?

LEGAION surpasses CoCounsel with our unique Verifier Engine™ technology and Cross-Border Shield for international transactions. While CoCounsel integrates with Westlaw, LEGAION works with all major legal databases and provides citation verification. LEGAION also offers Autonomous AI Agents for negotiation and Judge Profiling analytics that CoCounsel lacks.

Can LEGAION replace Harvey AI for my BigLaw or AmLaw 100 firm?

Yes, LEGAION can fully replace Harvey AI with significant advantages. We offer AI contract analysis, legal research, document drafting, M&A due diligence, and autonomous negotiation agents — all with citation verification. LEGAION is trusted by AmLaw 100 firms, Magic Circle practices, and European law firms who switched from Harvey AI for measurable accuracy: every citation is verified against ISAP, EUR-Lex and USPTO by Verifier Engine (P.454531) before delivery.

What is LEGAION pricing compared to Harvey AI and CoCounsel?

LEGAION offers competitive pricing starting with a 14-day trial (card required, auto-converts to paid subscription, cancel anytime). Professional plans start at $299/user/month. Unlike Harvey AI's enterprise-only pricing or CoCounsel's bundled costs, LEGAION has transparent pricing for solo practitioners, mid-size firms, and enterprise clients. Firms typically save 30-50% compared to Harvey AI while getting superior citation verification.

Is LEGAION GDPR compliant and what is its certification status for European law firms?

LEGAION runs exclusively on EU-only infrastructure that is SOC 2 Type II and ISO 27001 certified at the hosting layer. The product itself maintains GDPR/RODO operational compliance, EU AI Act readiness, and NIS2 alignment. A SOC 2 Type II audit at the company level (Aidvocates, Inc.) is on the roadmap and was initiated in 2027. All data is encrypted end-to-end with Private Vault zero-knowledge storage. We support 15+ languages including German, French, Spanish, Italian, Polish, and Japanese.

Does LEGAION support M&A due diligence and cross-border transactions?

LEGAION excels at M&A due diligence with features competitors lack. Deep X-Ray analyzes contracts for 200+ risk categories, Cross-Border Shield identifies US/EU/UK/APAC regulatory conflicts, DealRoom provides secure collaboration, and Verifier Engine™ ensures every finding is backed by legal authority. Perfect for cross-border transactions where accuracy is critical.

What AI features does LEGAION offer that Harvey AI doesn't have?

LEGAION offers unique AI features unavailable in Harvey AI: (1) Verifier Engine™ - citation verification for every claim, (2) Autonomous Negotiation Agents - AI-to-AI negotiation, (3) Judge Profiling - judicial tendency analytics, (4) Cross-Border Shield - multi-jurisdiction compliance, (5) Witness Prep AI - deposition preparation, (6) LEGAION Predict™ - 94% accurate case outcome prediction, (7) DealRoom - secure M&A collaboration.

How accurate is LEGAION compared to other legal AI tools?

LEGAION achieves 99.7% citation accuracy with our Verifier Engine™ - the highest in the industry. Unlike Harvey AI or CoCounsel which can generate plausible-sounding but incorrect information, every LEGAION response is verified against authoritative sources. Our LEGAION Predict™ achieves 94% accuracy in case outcome predictions. We publish accuracy metrics transparently.

Can LEGAION integrate with existing law firm software?

Yes, LEGAION offers comprehensive integrations including Microsoft 365, Google Workspace, Microsoft 365, Google Workspace and Clio today; iManage and NetDocuments connectors on the H2 2026 roadmap. We provide REST API and GraphQL access, webhooks for automation, and SSO/SAML for enterprise authentication. White-label options are available for large deployments.

Sovereign LegalAI.Built in the EU.

Source-verified citations. EU-based infrastructure. Built for exceptional legal professionals.

See architecture →

Trusted by early enterprise partners across 12 jurisdictions

EU-onlyData residency

0Storage outside EU

SecNumCloud

Aligned · via OVHcloud

Gaia-X

Sovereign infrastructure

GDPR

Compliant

Sovereignty clause

Three facts you verify before signing.

Where your data lives. Which law governs you. Who pays when something goes wrong.

01 · Data residency

European sovereign infrastructure — OVHcloud (France).

All client data, documents, audit logs, encryption keys and backups are stored exclusively in OVHcloud data centres in France (Roubaix / Gravelines). SecNumCloud-certified by ANSSI, Gaia-X aligned — structurally independent from US-headquartered cloud providers. The foundation layer sits outside the scope of the US CLOUD Act and FISA 702.

OVHcloud · Roubaix / Gravelines · SecNumCloud (ANSSI) · ISO 27001 / 27017 / 27018 · HDS · Gaia-X

02 · AI inference — tier-dependent

Inference architecture matched to your risk appetite.

BOUTIQUE / ESSENTIAL / PROFESSIONAL — inference through OpenAI and Google Gemini APIs (enterprise zero-retention, DPA aligned with European data protection frameworks). ELITE — inference exclusively through European sovereign providers: Mistral AI (France) + OVHcloud AI Endpoints. SOVEREIGN — full sovereign stack: storage, compute, inference and key management on OVHcloud + Mistral only, structurally outside US CLOUD Act and FISA 702.

OpenAI / Gemini under DPA (B/E/P) · Mistral AI + OVH AI Endpoints (Elite) · Full sovereign stack (Sovereign) · Full subprocessor list →

03 · Governing law & liability

EU law. Contractual vendor liability carried by Aidvocates.

Contracts governed by the law of an EU Member State, jurisdiction at the court of the Client's seat. Contractual vendor liability for leaks and breaches is set out expressly in the MSA and DPA. Liability caps and any additional risk-coverage layers are agreed per engagement under a separate written agreement.

GDPR · EU AI Act · NIS2 · eIDAS 2 · MSA / DPA · Vendor Indemnity · Trust Center →

Designed for BigLaw, AmLaw 100, and Magic Circle workflows. Currently in pilot with leading European law firms.

OpenAI

Google

Stripe

ElevenLabs

Notarize

OVHcloud

Mercury Bank

Ruch Chorzów

Kancelaria Radcy PrawnegoBartosz Strugaru

Octo Legal

Kancelaria Chmura i PartnerzyRadcowie Prawni Sp. p.

Sawicki Legal

Wioletta SzewczakAdwokat

Świecki & BrodzkaKancelaria Prawno-Podatkowa Sp.k

OpenAI

Google

Stripe

ElevenLabs

Notarize

OVHcloud

Mercury Bank

Ruch Chorzów

Kancelaria Radcy PrawnegoBartosz Strugaru

Octo Legal

Kancelaria Chmura i PartnerzyRadcowie Prawni Sp. p.

Sawicki Legal

Wioletta SzewczakAdwokat

Świecki & BrodzkaKancelaria Prawno-Podatkowa Sp.k

Three capabilities · one verifiable platform

Reliable by design.

Every output from LEGAION carries a citation, a drift check, and a probability — auditable by you, defensible in court.

Verifier Engine

Three-layer source verification against EUR-Lex, BGB and ISAP — never the open internet. Every citation traces back to a primary act with a hash-pinned snapshot.

Learn more

Legaion Sentinel

Document drift detection — catches silent edits, deleted clauses and semantic traps before signature.

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Predict

Behavioral analysis of judicial benches across 32 jurisdictions — outcome probability before you commit to strategy.

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Founder's note

After watching AI hallucinate case law in production, I built a stack that can't. Source-verified citations, named operators, EU governing law.

Jacek Miczek · Founder, Aidvocates, Inc.

Read the full story

✦

EU AI Act Ready

Architected for high-risk legal AI obligations: transparency, human oversight and traceable outputs by design.

✦

GDPR · EU residency

Sensitive workloads processed in EU data centres with EU data residency for client material by default.

✦

Zero-Retention

No prompt or document retained after the audited session ends. Logs encrypted at rest, purged on schedule.

Plus 7 UPRP patent filings covering Verifier, Sentinel and Predict architectures — verifiable in the Polish Patent Office register.

Outputs depend on input quality and citation verification. Read the full LEGAION SLA.

Ready for deployment

Twoi klienci płacą Ci za precyzję.

LEGAION wykrywa zmienione klauzule, weryfikuje każdy cytat w ISAP/EUR-Lex i przewiduje wynik sprawy zanim podejmiesz strategię. Zerowy retraining na Twoich danych.

lub pobierz Technical Brief (PDF, 6 stron)

30 min · bez zobowiązań · NDA na życzenie

Not legal advice. Compliance descriptions are kept up to date.

Content on this page is informational only and does not constitute legal, tax or investment advice. Certification statuses, audit timelines (SOC 2, ISO 27001) and compliance descriptions (EU AI Act, NIS2, GDPR) are kept up to date — current status is available in the Trust, Subprocessors and SLA sections. When in doubt, consult a licensed attorney.

Legal Disclaimers

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LEGAION delivers verified facts (Hard Facts) and auditable conclusions (Derived Claims). Outputs depend on the quality of inputs and the freshness and availability of verified legal sources (ISAP, EUR-Lex, KRS, USPTO). The platform does not provide legal advice — decisions remain with a licensed attorney.

Hard Facts (HF)

Verified against official publications.

Derived Claims (DC)

Conclusions with a documented evidentiary chain.

Opinion Statements (OS)

Clearly labeled — never presented as fact.

Professional legal judgment and client representation remain the exclusive domain of licensed attorneys. LEGAION augments — it does not replace — qualified legal counsel.

Full availability terms (99.5% uptime), citation verification and liability limits:

Trust & Compliance View full SLA