Omnilex and CASUS are both Swiss legal AI platforms, but they target different working realities. Omnilex is research-first: its strength lies in AI-generated legal commentary, statutes, decisions and commentary from Switzerland and Germany, and structured analysis workspaces. CASUS is all-in-one with document skills at its core – document review, playbook benchmarking, Agent Mode and legal research all run directly in Microsoft Word or the web app.
What do Omnilex and CASUS do – and where is the difference?
Both platforms cover legal research. The difference lies in what happens next.
Omnilex is designed as a research workspace. AI-generated commentary connects statutes, decisions and secondary literature; the Grid module analyses many documents in tabular form; Playbooks structure team knowledge. Those who write legal opinions daily or document litigation research will find a mature environment there.
CASUS starts from the document. The legal research module with over 660,000 cantonal and federal court decisions is part of a platform that also identifies risks in contracts, checks clauses against a playbook, writes changes directly into the Word document via Agent Mode, and proofreads for consistency at the end. Research and document work are connected in one workflow, not in separate tools.
A practical difference that shows up in day-to-day use: someone who clarifies a legal question in Omnilex and then wants to adjust a clause changes context. In CASUS, the research result can be translated directly into a clause via chat action – including correct numbering and formatting according to Swiss contract practice.
Side-by-side comparison
Feature | Omnilex | CASUS |
|---|---|---|
Legal research CH | Yes (core module) | Yes (660,000+ decisions, reasoning highlights) |
German (DE) sources | Yes (available now) | Coming soon (launching in coming weeks, as of June 2026) |
Contract review and risk analysis | Grid/Cases | Yes – party-aware, severity low/medium/high, directly in Word |
Playbook benchmark with clause insertion | Playbooks | Yes – incl. % match, clause inserted at the right place |
Agent Mode / redlining | Not documented | Yes – insert clauses, rewrite, check consistency |
Word add-in | Yes | Yes |
Data room (bulk extraction) | Grid (tabular) | Yes – custom columns via prompt (tabular) |
Proofread | Not documented | Yes – numbering, cross-references, placeholders and much more |
Hosting | Microsoft Azure (region not publicly specified) | CH/EU, no US transfer |
Price (per user) | CHF 1,600–2,000 / year | CHF 100/month (annual plan) · CHF 125/month (introductory, regular 145) |
Free trial | 14 days | Yes – 14 days |
Research – where Omnilex is strong and what CASUS covers
Omnilex has built its research infrastructure consistently: AI-generated commentary, by its own account millions of decisions from Switzerland and Germany, integration with DMS and knowledge management systems. The fact that the Swiss Federal Chancellery is a development partner is a clear signal for research depth.
CASUS covers the Swiss core requirement with over 660,000 cantonal and federal court decisions. Particularly useful for document work: relevant sections of legal reasoning are highlighted directly in answers, without needing to open the decision separately. German and Austrian sources are following shortly (as of June 2026).
Those who need German legal sources daily – commentary and decisions on German law, such as the BGB or HGB – while preparing complex legal opinions are currently better served by Omnilex. Those who look up Swiss decisions in the context of contract work – to justify a liability clause or review a termination provision – find a more direct path in CASUS from research result to clause.
Contract work – why the difference emerges inside the document
A concrete scenario: a four-person M&A team in Zurich receives a third-party SPA draft of 85 pages. The first step is a risk review that examines clauses from the buyer's perspective. In Swiss M&A practice, the clause types that consistently generate the most high-severity findings are liability caps without carve-outs for fraudulent misrepresentation, undefined MAC thresholds, and incomplete W&R schedules – precisely the issues a party-aware review surfaces first.
Then a benchmark runs against the internal SPA playbook: which standard clauses are missing? Where does the present wording deviate from the house standard? The result appears as a percentage match with individual findings, and missing clauses can be inserted at the right place in the document with one click – respecting the numbering the contract already uses.
Agent Mode then handles the detail work: adjusting wording, checking consistency across 85 pages, flagging contradictions between defined terms and clause text. In a typical setup, this noticeably shortens the review cycle – not because less is reviewed, but because the manual search work disappears.
For a final check, Proofread identifies open placeholders, incorrect cross-references and inconsistent party names – recurring error types that regularly appear in long SPA contracts.
A second scenario: an in-house legal team at a Zurich bank reviews FINMA-regulated loan agreements for compliance with internal guidelines. The AI Data Room extracts clauses on termination periods, security packages and default interest (the statutory rate under Swiss contract law is 5%) from hundreds of agreements into a table – anomalies are flagged automatically. That replaces weeks of manual review.
Hosting and professional secrecy
Omnilex operates its infrastructure on certified Microsoft Azure cloud systems and states DSG compliance. Which Azure region is used is not explicitly specified on the website.
That is not a criticism – Azure offers Swiss data centres as well. But for Swiss lawyers subject to professional secrecy obligations, the question is relevant: is the infrastructure in Switzerland or the EU, and does the provider explicitly exclude US data access? US law – in particular the CLOUD Act – can compel US-based providers to disclose data on their servers even when those servers are physically located in Europe. Whether Microsoft, as a US corporation, falls under this risk is a question law firms should clarify before deployment.
CASUS hosts exclusively in Switzerland and the EU, transfers no data to the US, and operates Zero Data Retention and No Human Review. Further details on the security architecture are available at /security.
Pricing compared
The pricing transparency of both providers makes comparison straightforward.
Omnilex costs CHF 2,000 per user per year (individual tier) or CHF 1,600 on a team licence. All modules are included; 14-day trial available.
CASUS is CHF 100 per seat per month on the annual plan (CHF 1,200/year, as of June 2026). Paying monthly, the current introductory price is CHF 125 per seat/month (regular CHF 145). All modules – research, review, benchmark, Agent Mode, data room, proofread – are included.
For a five-person team, the price difference amounts to CHF 2,000–4,000 per year – without any reduction in Swiss research quality.
When Omnilex is the better choice
Omnilex makes more sense when legal research makes up the majority of daily work – such as legal opinions and litigation. Those who regularly need German commentaries and decisions today are fully served by Omnilex without waiting. The DMS and knowledge integration for teams is also an argument where internal knowledge databases play a central role.
When CASUS is the better choice – and when both are worth it
CASUS fits when document work is the actual daily reality: contract review, benchmarking against playbooks, negotiation preparation, due diligence extraction, optimising correspondence. Research is not a separate tool here, but part of the same workflow.
A combination makes sense for teams that use both intensively: deep daily research with commentary (Omnilex) and efficient document work with embedded research (CASUS). The price difference makes this economically viable for larger teams.
Those who want to try CASUS: a free trial is available at app.getcasus.com/signup. The legal research module, risk and quality review and benchmark module are ready to use immediately.
FAQ
Is CASUS an alternative to Omnilex?
Yes, for law firms and legal teams where document work is central. CASUS offers legal research with 660,000+ Swiss decisions, contract review, benchmark, Agent Mode and data room in one platform – including Word integration and explicit CH/EU hosting.
Can CASUS do legal research?
Yes. The legal research module searches over 660,000 cantonal and federal court decisions, highlights relevant reasoning sections directly in answers, and delivers source-based, structured results. German and Austrian sources are following shortly (as of June 2026).
Does Omnilex have a Word add-in?
Yes, Omnilex offers a Word add-in. The exact feature scope compared to CASUS's Agent Mode is not documented in detail on the Omnilex website.
What does Omnilex cost, and what does CASUS cost?
Omnilex: CHF 1,600 (team) to CHF 2,000 (individual) per user per year. CASUS: CHF 100 per seat/month on the annual plan (CHF 1,200/year), or CHF 125 per seat/month paid monthly (introductory price, regular 145; as of June 2026). Both providers include all modules without additional charges.
How do the hosting models differ?
CASUS hosts exclusively in Switzerland and the EU without US data transfer, with Zero Data Retention. Omnilex uses certified Microsoft Azure infrastructure and states DSG compliance; the Azure region is not publicly specified.
Can Omnilex and CASUS be used together?
Yes. Teams with intensive research needs (opinions, litigation) and a high volume of document work can run both platforms in parallel. The price difference makes this economically viable for larger teams.
Is CASUS suitable for due diligence processes?
Yes. The AI Data Room allows uploading hundreds of documents, tabular extraction according to custom-defined fields, and automatic flagging of anomalies – such as missing liability caps or excessively long notice periods. Well-suited for M&A or compliance due diligence.
Which languages does CASUS support?
CASUS processes documents and delivers outputs in all languages. The legal research module currently covers Swiss sources; German and Austrian sources are following shortly.
