When legal teams search for a Legalfly alternative, the question is usually practical: which platform covers the same ground – contract analysis, risk review, document work – while meeting the compliance and data residency requirements that matter in their jurisdiction?
Legalfly is a Belgian legal AI platform focused on AI-powered contract review and Microsoft 365 integration. It is primarily aimed at large in-house legal teams and legal operations departments across Western Europe. For Swiss law firms and in-house legal teams, however, platform features are only part of the evaluation. Where are data processed? Is there any transfer to US infrastructure? Are Swiss legal sources included in the research function?
This article compares Legalfly with CASUS, a Swiss legal AI platform built specifically for Swiss law firms and in-house teams, and explains where CASUS addresses the gaps that often drive the search for alternatives.
Why Legal Teams Look for a Legalfly Alternative
Data residency and professional secrecy
For Swiss lawyers, data protection is not optional – it is a professional obligation. Client documents, contract contents, and internal legal opinions are subject to legal professional privilege. Many European and US-based legal AI providers process data on infrastructure outside Switzerland or the EU, which creates real exposure in M&A mandates, employment law matters, and regulatory proceedings.
Teams that cannot afford any ambiguity about where client data is processed need an alternative with a clear and verifiable data residency commitment.
No Swiss legal context
Legalfly is designed for Western European legal markets but is not specifically calibrated for Swiss law. Teams reviewing contracts under the Swiss Code of Obligations, assessing clauses under the Swiss Data Protection Act, or running research on Swiss case law often find that generic legal AI platforms produce outputs that are structured but not reliably grounded in Swiss legal sources.
Pricing fit for smaller teams
Legalfly's model – a platform fee plus per-user costs – is designed for larger legal operations functions. For mid-sized law firms or lean in-house teams, the cost structure can be disproportionate relative to actual usage and value delivered.
Workflow integration
Microsoft Word remains the primary working environment in most Swiss law firms. Tools that require a separate platform and lack native Word integration increase context switching and reduce day-to-day adoption.
What to Look for in a Legalfly Alternative
Evaluating alternatives means checking against criteria that matter for practical legal work:
Data residency: Hosting in Switzerland or the EU, with no transfer to the US.
Privacy guarantees: Zero Data Retention and no third-party human review of content.
Swiss legal sources: Access to relevant statutes, case law, and legal practice.
Word integration: Seamless embedding into the existing document workflow.
Feature depth: Not just risk flags, but actionable improvement suggestions, benchmarking, bulk document analysis, and proofreading.
Scalability: Appropriate for teams of varying sizes without disproportionate platform costs.
CASUS as a Legalfly Alternative: What the Platform Offers
CASUS, a Swiss legal AI platform, was developed specifically for Swiss law firms and in-house legal teams. The platform is available as a Microsoft Word add-in and as a web app. All data is hosted in Switzerland or the EU – with no transfer to the US. CASUS operates without third-party human review (abuse monitoring opt-out) and retains no content after processing (Zero Data Retention).
Here is an overview of the available modules:
Risk and Quality Review
CASUS Review analyzes individual contracts for risks and weaknesses. CASUS identifies the contracting parties and assesses risks from each party's perspective – not generically. Each finding is presented with assignment, relevance, and severity (low / medium / high). For every finding, CASUS provides concrete drafting options that can be applied directly in Word – with correct formatting, without copy-paste.
This is particularly useful for quickly spotting negotiation potential and identifying imbalanced clauses before or during negotiations.
Benchmark
The Benchmark workflow checks a document automatically against a reference standard – the team's own playbook or established best practices (for example for SPAs, NDAs, or DPAs). CASUS shows which standard clauses are missing, insufficiently specified, or deviating from the standard. Each gap comes with a recommendation, including the option to insert a suitable clause at the right place with correct formatting. The match with the standard is also shown as a percentage score.
AI Chat with Agent Mode
The AI Chat allows teams to ask questions directly about a document – for example about termination rights, liability caps, or cost structures. Answers are linked to the relevant passages so users can jump directly to the source text.
In Agent Mode, CASUS executes changes in the document: inserting clauses, rewriting text, adding or adjusting content. It respects document structure, numbering, and formatting, and places changes in the correct location. Consistency checks across the full document are also supported.
Legal Research
Legal Research within AI Chat provides source-based, structured first assessments grounded in statutes, case law, and legally reliable sources. Outputs – risk analyses of legal positions, argument lines, recommendations – can be reused directly in work product. No absolute guarantees about completeness are made; outputs are described as structured, traceable, and source-based.
AI Data Room
The AI Data Room enables parallel analysis of dozens or hundreds of documents. Users define what to extract via prompts; each table column is driven by a specific instruction. The tabular output is suitable for due diligence, compliance checks, and clause matrix extraction. Anomalies and deviations – for example liability without a cap, or notice periods above 12 months – are flagged and prioritized by risk.
Proofread
CASUS Proofread checks contracts and pleadings for language and formal consistency: spelling, grammar, Swiss spelling conventions (ss instead of ß), cross-references, definitions, annexes, numbering, contradictions, and open placeholders. It is a quality and consistency check – not a substantive legal review of the legal position.
Comparison Table: CASUS vs. Legalfly
Criterion | CASUS | Legalfly |
|---|---|---|
Hosting | Switzerland / EU | EU (Belgian) |
US data transfer | No | Not excluded |
Zero Data Retention | Yes | Not documented |
No human review | Yes (opt-out) | Not documented |
Microsoft Word add-in | Yes | Yes |
Web app | Yes | Yes |
Risk analysis (party-aware) | Yes | Yes |
Benchmark against playbook | Yes (incl. percentage score) | Yes |
AI Chat with Agent Mode | Yes | Limited |
Legal Research (Swiss sources) | Yes | Not specific |
AI Data Room (bulk analysis) | Yes | Yes |
Proofreading | Yes | Not documented |
Primary target audience | Swiss law firms and in-house teams | Large in-house / legal ops |
Information on Legalfly is based on publicly available sources; product details may change.
Who CASUS Is Best For
CASUS is the right fit for Swiss law firms and in-house legal teams that:
Cannot or do not want to process client data on US infrastructure.
Work primarily in Microsoft Word and need seamless document integration.
Need to analyze both individual contracts and large document sets.
Require source-based legal research with traceable outputs.
Are looking for a scalable solution that is economically viable for teams of varying sizes – not just large legal operations functions.
For broader context on legal AI in Switzerland, see the articles on AI contract review in Switzerland and the comparison of the best legal AI tools in 2026.
Teams evaluating additional alternatives can find comparisons for Harvey, Legora, and Spellbook.
Try CASUS
CASUS is available as a Word add-in and web app, with hosting in Switzerland and the EU, Zero Data Retention, and no third-party human review. For Swiss law firms and in-house teams looking for a compliant, practice-ready Legalfly alternative, CASUS covers the core workflows – contract review, benchmarking, AI chat, legal research, data room analysis, and proofreading – within a framework designed for Swiss data protection requirements.
FAQ
What is Legalfly?
Legalfly is a Belgian legal AI platform focused on AI-powered contract review and Microsoft 365 integration. It is primarily aimed at large in-house legal teams and legal operations departments in Western Europe, offering features such as redlining, playbook enforcement, and document analysis.
Why do Swiss legal teams look for a Legalfly alternative?
The main reasons are data residency concerns (hosting location and potential US data transfer), the absence of Swiss-specific legal sources, pricing that is disproportionate for smaller teams, and the need for native Microsoft Word integration in existing workflows.
Is CASUS a direct Legalfly alternative?
Yes. CASUS covers the core use cases – risk analysis, benchmark against playbooks, AI chat with agent mode, legal research, bulk document analysis via data room, and proofreading – with the specific difference that CASUS is built for the Swiss market and hosts all data in Switzerland or the EU.
Where is data stored when using CASUS?
CASUS hosts exclusively in Switzerland and the EU. There is no data transfer to the US. CASUS does not retain content after processing (Zero Data Retention) and does not allow third-party human review of user content.
Does CASUS offer a Microsoft Word integration?
Yes. CASUS is available as a Microsoft Word add-in. Improvement suggestions, clauses, and edits can be applied directly within the Word document – with correct formatting and without copy-paste.
What is the difference between the CASUS Benchmark and the Risk Review?
The Risk and Quality Review analyzes risks and weaknesses in an individual contract from each party's perspective. The Benchmark compares a document against a reference standard – an internal playbook or established best practices – and shows gaps, deviations, and the overall match as a percentage score.
Can CASUS analyze large numbers of documents at once?
Yes. The AI Data Room supports the upload of dozens or hundreds of documents. Users define what information to extract via prompts, and the output is tabular – suitable for due diligence, compliance, and clause matrix work across large document sets.
Does CASUS support legal research?
Yes. The Legal Research mode within AI Chat provides structured, source-based first assessments grounded in statutes and case law. Outputs are traceable and can feed directly into work product. No absolute guarantees about completeness are made.
