TreseliaThe power of what your firm knows, behind every file you sign.
Whole documents, written from your files and your firm's knowledge.
Treselia writes working sheets, letters, reports, memos and opinions from your documents and your firm's templates and past work. Less time re-reading files, every figure traceable to its source page, and juniors working the way your seniors do. You check and sign.
Risk-free first month: cancel and we refund what you have not used
Your firm's collective knowledge is its most valuable data.
Today it lives in people, and it leaves with them. Treselia keeps it, brings it to every new file, and gets better with every correction.
Choose a part of the circle
Your firm's knowledge
One memory for the whole firm, and it keeps learning.
Every file makes the next one better, and nobody has to be in the room to pass it on.
- Learns from
- Your past letters and files (how the firm writes and decides), what colleagues write down (approaches and firm questions), and every correction, confirmed by a colleague and retired if it stops helping.
- Gives you
- A structure first, from your template or past work; two views per section, what the firm knows and what official sources add; “How did we handle this?” on any passage; and rules where they apply, in your firm's voice.
Sealed test · ten years · about 15,800 fictional documents
56 of 60 questions answered right.
On a sealed test written before the run: Treselia 56 of 60, an AI with a standard file search 41, a general chatbot 3. Same answering AI in all three; only access to the files differs.
Where a standard file search went wrong: it missed facts buried in long files, miscounted cases across years, gave an amount a later decision had replaced, and once stated a figure that is in no file at all.
One rule keeps this safe: the firm's knowledge decides where to look and how to write. Figures about a client always come from that client's documents.
The archive, approaches and the shared firm folder are part of the Treselia app for Windows.
It reads the whole file, fills your sheets and answers your questions.
Give Treselia your documents (PDF, Word, Excel, scans). It fills your firm's own working sheets and checklists, lists what is missing, and answers any question from the file, quoting the page. In the Windows app, you can also ask questions across your firm's archive.
One lease file, start to finish · fictional example
Before starting
A junior opens a new lease file. Treselia shows how the firm does this, from a senior: "Read every addendum before trusting the end date."
The reading
It fills the firm's lease summary and answers the firm's four questions. End date p. 7 + quote, indexation base month p. 12. One answer is "not in the file", so the junior asks the client for the missing addendum.
The decision
The lease and the second addendum give different end dates. Both passages are shown side by side, and a person decides. The reviewer checks every value against its page and signs.
What the firm learns
The junior corrected one value, so Treselia proposes a lesson. Once a second person confirms it and it helps on past files, the next colleague gets it.
Tested on fictional client files
It writes the whole document, the way your firm writes it.
Letters, reports and memos, drafted from your documents and from what your firm has learned. Every draft comes with four things a partner looks for.
In every draft
Your firm’s structure
The outline your partners signed for each kind of document, for example facts, assessment, recommendation, fee.
Every figure with its page
Each date and amount carries the page it came from, so the reviewer checks in seconds.
In your firm’s voice
Its wording, its thresholds, what goes in each kind of document. In French, German or English.
It asks instead of guessing
When a habit is not confirmed yet, you get a question, not an invention.
It also writes
Due-diligence reports, letters asking clients for missing documents, year-end documents and minutes.
Tested on 48 client letters · a fictional fiduciary firm
42 of 48 letters ready to sign after a quick read.
The better flagship AI model on its own: 16 of 48. Same kind of model underneath. An AI reviewer scored each letter against the one the firm itself wrote, without knowing which system wrote it.
Less rework: with the better flagship model on its own, 32 of 48 letters went back for rework. With Treselia, 6 of 48.
Nothing goes out that a person has not checked.
Treselia is built so a professional can check what it produces quickly, and sign it with confidence.
- A source for every value
- Every figure and every answer points to its page and quote in your documents.
- Missing stays missing
- What the documents don't say is marked missing, never filled in. In our tests so far, no value was invented.
- Disagreements stop
- When two documents disagree, both passages are shown and a person decides.
- Checked before you see it
- Each draft is checked against the firm's signed method and the figures in your documents. What fails goes back to be fixed, not to your desk.
- A person signs
- A person checks and signs the work. Treselia sends nothing on its own. A reviewer or partner approves the work or sends it back.
Your field, your way of working
Treselia learns any firm's way of working. For six fields it also comes with ready sheets.
Fiduciary and accounting
Annual accounts, VAT, company tax, salaries, board minutes.
Law firms
Due diligence, shareholder agreements, contracts, termination memos.
Banks and credit
Credit files, loan covenants, onboarding checks.
Property management
Lease summaries, lease registers, building files, insurance.
HR and payroll
Salary summaries, personnel files, employment contracts.
Compliance
Onboarding checks, data-protection register, tenders, subsidies.
Your files stay with you
Ask questions about your documents, fill your firm's sheets, see what is missing and what disagrees, get a due-diligence report, and draft letters and memos your firm's way.
The Windows app works directly in the folders on your PC or your firm’s server. Everything on this page, including the shared firm folder, the archive and sign-off. Installed from the Microsoft Store.
Three plans. Unlimited colleagues on every one.
Prices in CHF, excluding VAT. Pay monthly, or yearly with 2 months free.
Risk-free first month: cancel and we refund what you have not used
Billed monthlyCHF 990 billed once a year. You save CHF 198
For a firm starting out
About 14 letters or 165 working sheets a month, or a mix
Fills in working sheets for you
Give it your documents and it fills in 24 ready-made sheets, or your own templates. Each figure shows the page it came from.
Answers questions about your documents
Ask in plain words. The answer quotes the page where it found it.
Writes letters, memos and reports
In your firm’s style, ready to edit. Including due-diligence reports and termination memos.
Looks up Swiss law and tax rules
Ask, for example, ‘What is the VAT rate?’ You get the answer from official Swiss websites, with a link to check it.
Hides client names before anything leaves your firm
Names are hidden before anything leaves your firm. Works with Word and Excel.
Works on the files already on your computer
The Windows app works directly in the folders on your PC or your firm’s server. Nothing to upload, and your files never rest on our servers. It also keeps your books, reads receipts and QR-bills, turns dictation into meeting minutes, and searches your old files.
Need more? CHF 100 of extra usage adds about 12 letters, and stays until you use it.
Register your interestBilled monthlyCHF 2,990 billed once a year. You save CHF 598
For a firm where several people work on the same clients
About 50 letters or 600 working sheets a month
Everything in Starter, plus:
One shared folder for the whole team
Everyone works from the same files, on your server, SharePoint or OneDrive. You decide who sees what.
A second person checks before it goes out
A partner approves each letter and report.
Every client’s deadlines in one calendar
A calendar of every client’s deadlines, and a ready letter asking clients for missing documents.
Need more? CHF 100 of extra usage adds about 14 letters, 17% more than a Starter top-up, and stays until you use it.
Register your interestBilled monthlyCHF 5,990 billed once a year. You save CHF 1,198
For a firm that wants it connected to its other tools
About 125 letters or 1,500 working sheets a month
Everything in Pro, plus:
Works with Outlook, Bexio and Microsoft 365
Drafts replies to e-mails in Outlook and takes figures straight from Bexio.
Checks a company before you take it on
Looks it up in the Swiss commercial register and on sanctions lists.
Shows who did what
A signed record of who wrote, checked and approved each document, and proof it was not changed afterwards.
Need more? CHF 100 of extra usage adds about 17 letters, 40% more than a Starter top-up, and stays until you use it.
Register your interestThree products. One price.
Velydian, Treselia and Timocéa, all at Growth level, sharing one allowance.
799665.83CHF a month
Instead of CHF 1,797. Save CHF 998 a monthCHF 7,990 billed once a year. You save CHF 1,598
Talk to us about the BundleTreselia
Reports, letters and memos drafted from your own files, every figure with its page and quote. About 170 letters a month if the whole allowance goes to Treselia.
Velydian
Every claim in your documents checked against its source.
Timocéa
Your firm’s AI in one place: governed, measured, and put to work through ready-made automations with no run limit.
Need more? CHF 100 of extra usage adds about 21 Treselia letters, 75% more than a Starter top-up.
No subscription? Top up from CHF 30 and pay only for what you use: CHF 100 drafts about 7 letters.
Register your interest.
Treselia opens first to a small group of firms that run it on their own files and help shape what comes next. Leave your email and your firm’s size, and we will write to you personally. No payment, no commitment.
Andy Christen
AI will soon write the first draft of most documents a firm sends out. What will set a firm apart is whether those drafts carry its own judgement and stand up to a partner’s review. We built Treselia so that they do.