The market for legal AI tools is expanding fast - and the options are getting harder to assess. For Swiss law firms and in-house legal teams, 2026 brings a very concrete question: which tool fits the day-to-day workflow, meets the requirements for data protection and data residency, and works with the specifics of the Swiss legal system? This legal AI Switzerland comparison 2026 gives a structured overview of the best-known platforms and where they differ.
What are Harvey, Legora, and Spellbook - and who uses them?
Harvey is a US legal AI company that targets large international law firms. The platform covers a broad range of document work, research, and drafting, with an emphasis on integration into existing firm IT infrastructure.
Legora comes from Sweden and positions itself as a European alternative focused on multilingual document work. The platform is used by Nordic law firms and has built recognition across Europe.
Spellbook is a Canadian tool originally built around contract review and drafting inside Word. It targets smaller and mid-size law firms as well as in-house teams.
All three platforms have real strengths. But none of them is built primarily for the Swiss market.
Why Swiss law firms look for alternatives
Data residency and privacy
US-based tools are subject to US law - specifically the CLOUD Act, which allows US authorities to access data under certain conditions, even when stored on European servers. For Swiss lawyers and in-house teams bound by professional confidentiality obligations, that is not an abstract concern.
Anyone processing client data needs a solution that can demonstrate hosting in Switzerland or the EU - and that does not transfer data to the US.
Swiss law and language
Many tools were primarily trained on US or UK law. For questions involving the Swiss Code of Obligations, Civil Code, Swiss Data Protection Act, or the Civil Procedure Code, the legal substance is often thin. Teams working in German, French, or Italian quickly hit limits with English-trained models.
Missing Word integration
Microsoft Word is the standard working tool in most Swiss law firms. Tools that operate only within their own web interface create extra work when copying contract text back and forth.
What good legal AI tools for Switzerland need
Four criteria matter:
Data residency: Hosting in Switzerland or the EU, no data transfer to the US, zero data retention, no human review.
Language competence: Reliable work in German (Swiss spelling conventions), with references to Swiss legal norms.
Workflow integration: Direct embedding in Microsoft Word; changes are made in the document itself, not in a separate editor.
Modular feature set: Contract review, benchmark against playbooks, legal research, proofreading, and bulk analysis for due diligence - all from one platform.
CASUS: the Swiss legal AI platform in detail
CASUS is a Swiss legal AI platform built for Swiss law firms and in-house legal teams. Hosting is in Switzerland and the EU - with no data transfer to the US. CASUS operates with zero data retention and offers an opt-out from the abuse monitor, meaning no human review of documents.
The platform runs as a Microsoft Word add-in and as a web app.
Risk & Quality Review
The review workflow analyses contracts for risks and weaknesses. CASUS identifies the contracting parties and assesses risks from each party's perspective - not generically. Each finding is rated by severity (low / medium / high) and comes with a concrete improvement suggestion as a drafting option that can be applied directly in Word.
Useful whenever negotiation potential needs to be identified quickly or imbalanced clauses need to surface.
Benchmark
The benchmark workflow checks a document against a reference standard - either an internal playbook or established best practices (for example SPA, NDA, DPA). The output shows which standard clauses are missing, insufficiently specified, or deviating. For each gap, CASUS provides a recommendation, including the option to insert a suitable clause at the right place with the correct formatting. A percentage match with the standard is also shown.
More on the benchmark product page.
AI Chat with Agent Mode
The AI Chat lets users ask questions about a document and jump directly to the relevant passage. In Agent Mode, CASUS executes changes in the document - inserting clauses, rewriting text, adding or adjusting content - while respecting structure, numbering, and formatting. The agent also checks consistency across the whole document and references impacted passages.
Legal Research
The legal research mode is embedded in AI Chat. It produces structured, source-based assessments of legal questions - with risk drivers, pro and con argument lines, and concrete recommendations. Outputs can be reused directly, for example for internal memos or as a basis for clause adjustments.
Important limitation: CASUS does not produce guaranteed or exhaustively complete legal opinions. Outputs are source-based, structured, and traceable - but not a substitute for legal review.
AI Data Room
The AI Data Room allows parallel analysis of dozens to hundreds of documents. Users define what information should be extracted and receive tabular output - suited for Excel, due diligence, or compliance workflows. Deviations (for example liability without a cap, notice periods over 12 months) are flagged and prioritized by risk.
Also suited for data protection use cases: CASUS detects personal data and prioritizes sensitive categories such as HR or health data.
Proofread
The proofread module checks contracts and pleadings for spelling, grammar, and stylistic consistency - without changing legal meaning. It applies Swiss spelling conventions, checks cross-references, definitions, and annexes, and finds placeholders like [●] or TBD before documents are sent.
Comparison: CASUS vs. Harvey, Legora, Spellbook
Criterion | CASUS | Harvey | Legora | Spellbook |
|---|---|---|---|---|
Hosting | Switzerland / EU | USA / EU | EU (Azure, regional) | Canada / USA |
US Data Transfer | No | Configuration-dependent | Configuration-dependent | Yes |
Zero Data Retention | Yes | Yes | Yes | Yes |
Word Add-in | Yes | Yes | Yes | Yes |
Swiss Legal Context | Yes | Limited | Limited | Limited |
Risk Review | Yes | Yes | Yes | Yes |
Benchmark Against Playbook | Yes | Yes | Yes | Yes |
AI Data Room | Yes | Partial | Partial | No |
Legal Research (Swiss Sources) | Yes | Limited | Limited | No |
Proofread (Swiss Conventions) | Yes | No | No | No |
Note: Information about third-party providers is based on publicly available information and may change. For binding statements, their current data protection documentation should be reviewed.
Who CASUS is best suited for
CASUS fits Swiss law firms that want to handle contract work efficiently in Microsoft Word without switching to a separate tool. It also fits in-house legal teams in Switzerland that want to accelerate due diligence, check contracts against internal standards, or structure data protection compliance workflows.
The platform is the right choice when data security is non-negotiable - no US hosting, no human review, no data retention after analysis.
More on data security on the security page.
Try CASUS
CASUS is available as a Swiss platform without US data transfer and is ready to use immediately. Anyone who wants to try legal AI in their daily work can start free access at app.getcasus.com/signup - no credit card required, directly in the browser or in Word.
FAQ
What is the difference between CASUS and Harvey?
Harvey is a US platform focused on large international law firms. Data is processed in the US. CASUS is a Swiss platform with hosting in Switzerland and the EU, no data transfer to the US, and zero data retention. CASUS is also designed around Swiss legal norms and Swiss language conventions.
Is CASUS GDPR- and nDSG-compliant?
CASUS hosts in Switzerland and the EU, transfers no data to the US, operates with zero data retention, and offers an opt-out from human review. For a legal assessment of specific compliance requirements, the security page should be consulted and legal counsel sought where needed.
Can CASUS be used directly in Microsoft Word?
Yes. CASUS is available as a Microsoft Word add-in. Suggestions from the review, benchmark, or agent mode can be applied directly in the document - with correct formatting, without copy-paste.
Which contract types does CASUS support?
CASUS works with a wide range of contract types, including NDAs, SPAs, DPAs, service agreements, and employment contracts. The benchmark workflow can be configured against internal playbooks or best practices for specific contract types.
What does the AI Data Room do?
The AI Data Room analyses many documents in parallel. Users define what information should be extracted - for example liability clauses, IP provisions, notice periods - and receive tabular output. The tool flags deviations and prioritizes risks. It is suited for due diligence, compliance audits, and data protection screening.
How does Legal Research in CASUS differ from a normal AI search?
The legal research mode in CASUS uses statutes, case law, and legally reliable sources. Outputs are structured and traceable - with risk drivers, argument lines, and concrete recommendations. A standard AI search returns general internet answers without any legal source grounding.
What does the Proofread module check?
The proofread module checks spelling, grammar, and stylistic consistency according to Swiss conventions, reviews cross-references, definitions, and annexes, and finds placeholders like [●] or TBD. It does not change the legal meaning of the text.
Is there a free trial?
Yes. Free access can be started at app.getcasus.com/signup.
