S
Silex
Silex is a legal research platform for Swiss law from Ex Nunc Intelligence SA of Lausanne, a spin off of EPFL that worked in stealth from 2023 and launched in 2025. A question in French, German, Italian or English returns an answer reasoned over federal and cantonal legislation, court decisions, doctrine and commentary, with every statement cited to its source. The collection holds more than 800,000 sources, is updated daily and can be scoped by canton, field of law and source type, including FINMA circulars.
Answers turn into first drafts of memos, letters and clauses with citations carried through and export to Word or PDF. Agents anonymize, translate, compare documents, transcribe audio, write meeting minutes and fill notarial documents, and Silo lets a firm query its own documents beside the public sources. Silex runs on self hosted language models, stores all data on Infomaniak in Geneva and processes it on Azure in Switzerland North.
It names more than 800 law firms, notaries, fiduciaries and legal departments as users. Plans start at CHF 149 a month for one user, with Team and Enterprise tiers and custom contracts.
Silex, head to head
Side by side on the same 15 capability axes and 12 legal signals: where the two part company, and what neither one publishes.
Alternatives to Silex
Vendors in the same categories as Silex whose graded profiles look most alike, with a line on what each product does.
Similar is not the same, so check that each one does the job you need. No vendor pays for placement.
- LLuliusLulius is an AI research platform for German federal law and EU law, sold to law firms and also to consumers, companies and tax advisers.
- DDescrybeDescrybe is a US primary law research platform built on AI summaries of judicial opinions, now at descrybe.com (descrybe.ai redirects).
- LLexlegis.aiLexlegis.ai is an Indian legal AI platform operated by Lexlegis Solutions Private Limited of Mumbai.
- LLexroomLexroom is an AI research and drafting platform for legal professionals in continental Europe, sold in Italy, Spain and Germany and working entirely in the local language.
- AAnnlexAnnlex is a case law research platform for United States court opinions, operated by Annlex Systems LLC and created by founder Doug Hall.
- GGaius-LexGaius-Lex is an AI research and drafting agent for lawyers and tax advisers covering Polish, Czech, Austrian and German law.
Ordered by how closely the graded profiles match across the 15 capability axes, inside the same categories. See how each axis is graded in the methodology.
Capability grades
All 15 axes, graded from public sources on the date shown. Hover a grade to see what the letter means on that axis.
AI Centrality
How much of the product is actually AI. Whether the machine learning is the mechanism the buyer is paying for or a feature layered onto conventional software, and whether the vendor is specific about which is which.
Research answered by a model reasoning over a Swiss legal collection is the product, and legal research is unlimited on every plan. Drafting turns an answer into a memo, letter or clause, and agents handle anonymization, translation, document comparison, transcription, minutes and notarial forms. Silo extends the same retrieval to a firm's own documents. Without the models, what would remain is a collection of sources with no product built around it.
Citation Accuracy and Hallucination Disclosure
Whether the vendor publishes measured accuracy on citations and assertions, grounds output to primary sources, and says plainly what its system does when it does not know. Legal has a documented public record of fabricated citations reaching filed briefs, so an untested claim of accuracy is not evidence.
Every answer is built from retrieved Swiss sources and returned with full citations, such as articles of the Code of Obligations or Federal Supreme Court decisions by reference, so a lawyer can open and check each one. Retrieval can be narrowed by canton, field of law and source type, and citations carry into drafts. Silex describes its design as protected against invented citations. No accuracy figure, test set or error rate is published, and the terms disclaim the accuracy, completeness and relevance of answers.
Autonomy and Oversight Model
What the system decides on its own, what a lawyer must approve, and whether the vendor documents where the review point sits. A tool that drafts under review and a tool that files without one are different products and different risks.
The product is framed as a thinking partner rather than an answer machine: it supplies sources and reasoning for the lawyer to build a position on. Each answer is documented and cited, ready to verify before use, and drafts open for editing before export. Section 10 of the terms makes the client responsible for evaluating the relevance and correctness of each response before applying it to a case. Agents run single tasks on documents the user supplies. No stopping point or route after a wrong answer is described.
Operational and Outcome Evidence
Named, dated evidence that the product works in production at real firms or legal departments. Case studies with figures and identified customers count. Unattributed testimonials and launch announcements do not.
More than 800 law firms, notary offices, tax advisories and corporate legal departments use Silex, by its own count. Named voices include Privera's head of property management, an attorney and tax expert at Boivin Sarl and a partner at Valfor Avocats, alongside a national councillor and a former head of legal at private banks. The quotes describe faster research and fewer invented references, and the site claims up to 85% savings on legal database subscriptions, with no figure tied to a named customer.
Privilege and Confidentiality Posture
How client confidences are handled: attorney client privilege and work product treatment, segregation of one client matter from another, whether client data trains any model, and what the vendor commits to in writing rather than in marketing.
Section 13 of the terms commits Ex Nunc Intelligence to absolute confidentiality over every question and document a client submits, expressly including material under professional secrecy in Article 321 of the Swiss Criminal Code. Client data serves only that client's own questions, is never used for the company's own account or to improve its AI, and is trained on only with the client's prior consent. Breaches are reported promptly, and at the end of the agreement data is returned or destroyed with confirmation.
Each organization's documents sit in a dedicated retrieval silo that is never mixed with another's. The terms still recommend anonymizing documents before upload. Separation between matters or users inside one firm is not described.
UPL and Professional Responsibility Posture
Whether the vendor is clear that it supplies a tool rather than legal advice, who its audience is, and how it addresses unauthorized practice of law, competence and supervision duties, and jurisdiction limits. ABA Formal Opinion 512 is the reference point. Where the advice line is not the duty a product raises, the axis is read through the nearest professional duty it does raise: judicial conduct rules and the reviewing duty for products sold only to courts, and the duty to bill for time actually spent for products that draft time entries.
Use is limited to legal professionals, named as attorneys, notaries, licensed business agents and in house counsel, and judicial and law enforcement authorities are excluded except for preparatory work. Section 10 of the terms states that nothing the platform provides is personalized legal advice or replaces consultation with a legal professional. The coverage is Swiss law throughout. Supervision and competence duties beyond professional secrecy are not discussed.
AI Governance and Bias Disclosure
Published governance over model behavior: who owns it inside the vendor, what is tested before release, and what is disclosed about disparate output across matter types, parties, or populations.
Silex publishes no AI governance policy, set of principles, testing method or named owner. The AI instructions page summarizes the company and product for automated readers rather than setting out governance, and nothing addresses uneven answers across cantons, languages or fields of law.
AI Safety and Data Stewardship
Retention, deletion, access control, and what happens to prompts and documents after they are processed. Whether the vendor states its subprocessors and its incident practice, or leaves the buyer to assume.
Retention is specific. On the basic plan, research history stays on the user's device; where history is kept, it is encrypted and held in Switzerland, and Incognito mode stores nothing in the database, backups or logs. Any question or the whole profile can be deleted on demand, deleted data leaves backups after 14 days and technical logs are kept for 30 days.
Data sits on Infomaniak in Geneva under LUKS2 AES-256 encryption with keys in an isolated vault, uploaded files are encrypted before upload, and Azure in Switzerland North computes without storing client data. Access follows least privilege, infrastructure is managed in house as code with no outside managed access, and Seculabs ran an independent penetration test in December 2025. Prompt notice of any breach affecting client data is a contractual duty.
AI Liability and Recourse
What the vendor stands behind contractually when its output is wrong. Indemnities, caps, carve outs, insurance, and whether any of it is published or only reachable through a negotiated agreement.
Section 11 of the terms bars any claim for damages unless the company acted intentionally or with gross negligence, and lists direct or indirect damage from relying on the platform's results among the exclusions. The platform is provided as is, without warranty on the accuracy, completeness or relevance of answers. No cap figure, indemnity or insurance is stated. Misuse by a client carries a contractual penalty of CHF 50,000 per case.
Practice Systems Integration Depth
How deeply the product reaches into the systems legal work already lives in: document management such as iManage and NetDocuments, Word and Outlook, contract lifecycle management, matter management, e-billing, and court filing systems.
Every plan includes connected applications, with SharePoint named, and Silo brings a firm's contracts, templates and know how into a dedicated store for querying beside the public sources. Sign in works through Microsoft Entra ID, SAML or OpenID Connect, and drafts export to Word or PDF. What the SharePoint connection moves, in which direction and what a firm configures is not described, and no document management or practice management system is named.
Deployment Model and Data Residency
Where the software runs and where the data sits. Multi tenant cloud, single tenant, private deployment, on premises, and whether region of residence is a published option or an enterprise conversation.
All client data and backups are stored on Infomaniak, a Swiss owned cloud in Geneva, with load balancing and redundancy also in Switzerland. Processing runs on Azure in the Switzerland North region and holds no client data, so storage and processing locations are stated apart. The language models are self hosted, and each organization's documents live in their own retrieval silo. Switzerland is the only region, by design, and every plan runs on the same setup.
Security Certifications and Trust Center
Independent attestation a buyer can pull without a sales call: SOC 2, ISO 27001, penetration test summaries, a trust center with current reports and named scope rather than a badge image.
No independent attestation is held yet. ISO 27001 is targeted for the third quarter of 2026, and the security page describes an independent penetration test by Seculabs in December 2025 that found no breach. No SOC 2 report, certificate or trust center is offered.
Model Supply Chain Disclosure
Which models sit underneath, whose they are, where they run, and whether the vendor commits to telling customers when that changes. A legal buyer inherits every dependency it cannot see.
The language models are self hosted, and no data is sent to outside AI providers. They run on Azure compute in Switzerland North, with all persistent data on Infomaniak. Which models are used and whose they are is not stated, and no notice of a change in model is promised.
Commercial Transparency
Whether a buyer can learn what this costs without entering a sales process: published rates, the unit being charged, what sits behind an enterprise tier, and what implementation adds.
Prices are published in Swiss francs, excluding VAT. Solo costs CHF 149 a month, or CHF 1,440 a year, with 10 agent credits and 20 GB of storage. Team covers up to five seats at CHF 490 a month or CHF 5,280 a year with 100 credits and 200 GB. Enterprise covers up to ten seats at CHF 895 a month or CHF 9,600 a year with 300 credits and 500 GB. Legal research is unlimited on every plan, a Custom plan is quoted, and a 7 day trial needs no card.
Firm and Practice Coverage
Who the product is actually built for. AmLaw, midlaw, small firm and solo, in house departments, government and courts, and which practice areas are supported rather than merely claimed.
Silex covers Swiss federal and cantonal law in four languages for law firms, notaries, fiduciaries and tax advisers, corporate legal departments and regulated institutions, from the solo office to teams of ten and beyond on custom terms. Questions can be scoped by canton, field of law and source type. Judicial and law enforcement authorities are excluded except for preparatory work. Fields of law where the collection is thinner are not identified.
3 public documents
The public pages on file for Silex, with the recorded signals each one supports and the date it was last read. Open any of them and check the reading against the record.
-
silex.legal/en/security3 signals
Prompt and Output Retention, Ethical Walls and Matter Segregation, Outside Counsel Guideline Readiness
Read Oct 13, 2026
-
silex.legal/en/terms-conditions3 signals
Client Data in Training, Primary Law Corpus Provenance, Bar Guidance Alignment
Read Oct 13, 2026
-
Fabricated Citation Record
Read Oct 13, 2026
From CHF 120 per month, billed annually
- Silex shows its prices in Swiss francs, before VAT.
- One person pays CHF 149 a month, or CHF 1,440 for a year.
- A team of up to five pays CHF 490 a month, and up to ten pays CHF 895 a month.
- Every plan can ask unlimited legal questions; plans differ in seats, agent credits and storage.
- Bigger organizations get a custom price, and there is a free 7 day trial.
Priced per plan in CHF, excluding VAT, monthly or yearly. Solo is CHF 149 a month or CHF 1,440 a year (CHF 120 a month) for one user with 10 agent credits a month and 20 GB of storage. Team is CHF 490 a month or CHF 5,280 a year for up to five seats with 100 credits and 200 GB. Enterprise is CHF 895 a month or CHF 9,600 a year for up to ten seats with 300 credits and 500 GB. Every plan includes unlimited legal research, all AI agents and connected applications such as SharePoint. Custom covers tailored seats under a contract fitted to the organization.
Implementation: None stated for the published plans. Custom plans are priced per organization.
Confidentiality and data terms: None
Note: Annual billing saves more than 10%. Seats, agent allowances and Silo storage are shared across a workspace. The 7 day trial needs no payment card. Late payment brings a CHF 20 reminder fee under the terms.
Legal Signals
What each signal meansA signal records what public sources say on the date shown. It is not a grade and it is not a recommendation. Where a signal reads Not addressed, it means the index did not locate the material in public sources on that date, which is a statement about disclosure rather than about the product.
Client Data in Training
Can material a lawyer puts into this product be used to train a model?
The published terms prohibit training on customer content. Not a policy page, the agreement.
Section 13 of the Silex terms states that client data serves only that client's own questions, is never used for the company's own account and is not used to improve its AI systems. A further clause allows training only with the client's prior consent. The security page adds that user data never trains or fine tunes the models.
Prompt and Output Retention
How long does the product keep what a lawyer typed, and can that be set to zero?
The customer sets the retention window and no retention is an available setting.
Users choose how much is kept. Incognito requests store nothing in the database, backups or logs; on the basic plan history stays on the user's device; otherwise history is encrypted and held in Switzerland. Any question or the whole profile can be deleted on demand, deleted data clears from backups after 14 days, and technical logs last 30 days.
Ethical Walls and Matter Segregation
Does retrieval respect the firm’s ethical walls, or can the model read across them?
The product maintains its own permission model, documented, requiring the firm to keep it aligned.
Each organization's documents sit in a dedicated retrieval table that is never mixed with another organization's, and access runs through single sign on with Entra ID, SAML or OpenID Connect. Separation between matters or users inside one organization is not described.
Third Party Request and Subpoena Notice
If someone subpoenas the vendor for a firm’s data, does the firm hear about it first?
No located term or policy addresses third party requests for customer data.
Client data may not be disclosed to any third party without the client's prior written authorization. Neither the terms nor the privacy policy address a request from an authority or a court, or notice to the client if one arrives.
Primary Law Corpus Provenance
Where does the law in this product come from, and does the vendor have the right to use it?
The vendor names its primary law sources and the license or public domain basis for each, with an update cadence.
The collection draws on public databases, mainly federal and cantonal legislation and case law, including the Swiss federal compilation, and on legal scholarship written by authors who work with the company. Doctrine and commentary are built in house rather than licensed, more than 800,000 sources are held, and the collection is updated daily.
Good Law Verification
Does the product tell you when the authority it just cited has been overruled?
No located public material addresses whether authority is checked for subsequent history.
Answers cite decisions and legislation by reference, but nothing describes a check on whether a cited decision has been overturned or a provision amended since.
Refusal and Uncertainty Behavior
What does the product do when the answer is not in the corpus?
No located public material addresses what the product does when it cannot ground an answer.
Answers reason only from Swiss sources and are designed against invented citations, but nothing describes what Silex returns when the sources do not support an answer, or any confidence shown to the user.
Fabricated Citation Record
Does a public court record exist addressing fabricated or hallucinated legal citations in output from this product?
No court order, opinion or disciplinary record addressing fabricated or hallucinated legal citations produced by this product has been located as of the date shown. This is a statement about the public record on that one subject, not a finding about the product, and this signal is not a litigation history.
The AI Hallucination Cases database maintained by Damien Charlotin, which records court decisions worldwide that address hallucinated AI content and the tool involved where known, has no entry naming Silex or Ex Nunc Intelligence.
Bar Guidance Alignment
Has the vendor engaged in public with the ethics opinions its buyers are bound by?
Public materials refer to professional responsibility in general terms without naming guidance.
Professional secrecy under Article 321 of the Swiss Criminal Code is the frame for both the terms and the security page, which recall the statutory secrecy duty of attorneys, notaries and business agents. No bar association guidance on AI use is named.
Billing and Fee Posture
Does the vendor address what happens to the bill when the work takes an hour instead of six?
Public materials claim time savings without addressing billing or disclosure, and the product sits inside a fee relationship between a lawyer and a client where those savings would change the bill.
Law firms and notaries are the main buyers. The interface is described as built to maximize billable impact, with claims of less research time and up to 85% savings on database subscriptions. Nothing addresses how AI assisted research should be recorded or billed to a client.
Outside Counsel Guideline Readiness
Can a firm get this vendor through a client’s AI clause without a bespoke negotiation?
A current subprocessor or model provider list is published.
The security page accounts for each layer of the service: Infomaniak in Geneva for all data and backups, Azure in Switzerland North for processing only, and self hosted models with no outside AI provider. No client facing disclosure pack is offered.
Court Disclosure Support
If a judge’s standing order requires an AI disclosure, can the product produce one?
Some elements of the record are available, short of a document level export.
Citations from each answer carry into drafts exported to Word or PDF, so the sources behind a draft travel with it. Nothing records the model used or the human review behind a filing.