Find the information you need
Combine legal sources, firm resources and web research. Trace the references used in each answer.
Advanced legal and web researchDesigned by Walloon lawyers, for Walloon lawyers.
Legal support for every case.
A contract to review, a question to research, a letter to draft. Jef works with your documents and remembers your preferences, whether you practise on your own or in a firm.
50 free messages · Every feature included
An initiative of theBrussels Bar
jefFind the relevant information to help me prepare my research on this case.
Search your sources
Search legal sources, your documents and the web. Find the references used to take your analysis further.
Find the references used
Jef remembers your preferences as you chat.
✓ Data stored in the European Union✓ Your documents are never used for training✓ Designed by a lawyer, for lawyers
- documents across all collections
- +2.3m
- registered users
- +2,800
- messages exchanged
- +680,000
Cumulative figures as of 13 September 2026.
Practical help
with your cases.
Ask a question or add a document. Jef helps you prepare the next step.
Analyse your case documents
Summarise a case file, compare versions and ask questions about your contracts, letters or scanned documents.
Analysis, summaries and comparisonsPrepare your drafts
Draft a letter, structure a memo or revise draft written submissions. You review, adjust and approve.
Drafting based on your documentsTranscribe your meetings.
Connect your calendar so Jef can join your Google Meet, Teams or Zoom meetings and take notes to add to your case files automatically.
Google Meet
Microsoft Teams
ZoomComing soonPreparation meeting
00:18 · Speaker 1Let's go through the documents received this week.
00:26 · Speaker 2I've added the contract and the latest correspondence to the case file.
Meeting summary
Contract and correspondence added to the case file. Next step: review the documents received.
Legal monitoring and connections to your tools are also included.
All featuresIn everyday legal practice
“I start with a specific question and find the sources I need to consult. Jef helps me prepare my research; I remain in charge of the analysis.”
First name Last nameSole practitioner
“At the firm, we can find our templates and reference documents in one place. Everyone can also keep their own notes private.”
First name Last namePartner
“When I pick up a case, I ask for a summary of the documents and the points to check. I can then return to the passages I need.”
First name Last nameAssociate
Legal skills
Skills to help prepare your legal work.
A skill gives Jef a method for a specific task: preparing oral submissions, organising exhibits or testing an argument. You provide the case file; Jef follows the set steps.
A preview of the skills catalogue, with new additions regularly.
Explore legal skillsThe advocate
Prepare oral submissions using the evidence and arguments in your case file.
The challenger
Spot weaknesses in your reasoning and anticipate opposing arguments.
Exhibit inventory
Organise and number your exhibits to prepare your schedule.
An assistant that learns
to work with you.
Jef remembers your writing style and instructions. In a firm, you also choose which documents to share.
Your preferences are remembered
Jef remembers your preferences as you chat. You have fewer instructions to repeat from one case to the next.
You decide what is shared
Share your templates and resources with the firm. Each team member can also keep their own documents private.
C Your firm's workspace
Shared documentsAuthorised team
Letter templates
Firm resources
My private documentsOnly me
Personal notes
Confidential case file
You choose who can access what.
Google Drive
OneDrive
SharePoint
Gmail
OutlookDocuments, emails and recordings.
PDFDOCXXLSXPPTXEmailsImagesAudio
View supported formats
Your documents stay private.
Your documents are never used to train AI models. You choose which team members can access them.
Our security commitments
Penetration test
CASA AL1Storage in the European Union
Your data is stored with 
Scaleway, a cloud provider.
Encrypted data
In transit and at rest.
No training
Your documents are never used to train AI models.
Controlled access
Documents kept private or shared with authorised team members.
A choice of models
AI evolves. So does Jef.
Jef works with several AI providers. This lets us select the models best suited to your needs and adapt that choice as the technology improves. You keep your case files, preferences and working environment.
Benefit from better AI without changing tools.
Several providers, the freedom to choose.
Before you start
The trial, your documents and working as a firm.
What does the free trial include?
You get 50 free messages to try Jef. Every feature is available, including transcription and legal monitoring. There is no commitment.
Is Jef suitable if I work on my own?
Yes. You can use Jef as a sole practitioner, with your own documents and preferences. In a firm, you can share your resources with the team members you choose.
Do I need to upload all my documents?
No. You can start with legal sources and web research, then add documents relevant to your case to personalise your conversations.
Are my documents used to train AI?
No. Your documents stay private and are never used to train models. Remembering your preferences helps personalise answers within your workspace.
Does Jef replace my legal analysis?
Jef helps you research, analyse and draft. You retain your advisory role and check the sources, answers and draft documents before using them.
Try Jef on
one of your cases.
Research, drafting, transcription and legal monitoring: every feature is available during your trial.
Try for free
50 free messages. No commitment.