01
Estimated cost
EUR 5,760 over 10 years
You pay a lifetime rent for a tool that does not belong to you
Every month the direct debit goes through. Bit by bit, you have paid EUR 2,000 to 6,000 for access you lose the moment you stop paying.
New range — 2026Your business tools in 1 file.
Your business tools in 1 file.
Buy once. Forever.
Quotes, invoices, client tracking. All in a single file you truly own. No subscription. No cloud. No account.
One-time paymentWorks offline
file:///Users/yan/Documents/invoice-studio
Designed for professionals who want to stay in control of their tools
Small businesses and freelancersBuilding craftsmenCoaches and therapistsPhotographersReal estate agentsAccountantsLawyers and notariesIndependent consultantsSmall businesses and freelancersBuilding craftsmenCoaches and therapistsPhotographersReal estate agentsAccountantsLawyers and notariesIndependent consultants
Today
Your business tools are a silent problem.
Three things have been normalized that should not have been. Here they are.
02
Hosting
Remote servers, off your machine
Your client and tax data live on someone else s server
Addresses, amounts, invoices, files: all hosted elsewhere. You don t know exactly where, who has access, or what happens in case of a breach.
03
Onboarding
Half a day minimum
The tool has become an over-engineered machine
200 screens, 50 settings, 30 integrations that don t concern you. Half a day to understand, support to configure, and every update breaks a habit.
The answerWe reverse
We reverse
the contract.
You are no longer a tenant of your tool. You own it, like a book, like a notebook, like everything that holds value in your craft.
- 01
You buy the file.
It is yours. No monthly rent, no access rights that can be cut tomorrow.
- 02
Your data stays put.
Everything remains on your machine. No server stores your clients, your invoices, your notes.
- 03
The service does not shut down.
It s a standalone file. It will work in 5 years, in 10, as long as a browser can open it.
How to use it
Three steps. Under a minute.
1
Choose your studio
Browse the catalog. Select the business tool that fits your activity. Secure one-time payment.
30 sec2
Download the file
A single file lands in your inbox. No installation, no extension, no account.
10 sec3
Open it. Use it.
Double-click. The studio opens in your browser. Everything works offline, immediately, forever.
5 secThe catalog
One studio per profession.
Each Cahier Autonome is built for a specific use. No extra features, no useless screen. Just the essentials, refined.
B2B quotes and invoices
Invoice Studio
Quotes, invoices, payment tracking. Built-in PDF export.
- Unlimited quotes
- Unlimited invoices
- PDF export
- Multi-client
From
185 EUR
Coaching, sports and wellness tracking
Coach Studio
Clients, programs, sessions, measurements, payments. Complete coach management, in 1 standalone file.
- Session tracking with heart rate
- Programs and exercise library
- Measurements and progression
- Payments and packages
From
144 EUR
Real estate mandate tracking
Immo Studio
Mandates, viewings, buyer and seller prospect tracking. For independent real estate agents.
- Mandates
- Viewings tracking
- Buyer pipeline
- Property comparator
Price announced at launch
Real estate profitability simulator
Detecteur Studio
Simulator, taxation, amortization, reference data. For independent real estate investors.
- Project simulator
- Taxation 2026 (LCD, IS, deficit foncier)
- Amortization
- Reference data
Price announced at launch
Photo shoot tracking
Photo Studio
Shoots, client contracts, gallery delivery, payments. For professional photographers.
- Shoot planning
- Contracts
- Deliveries
- Payments
Price announced at launch
Comparison
Subscription software or Cahier Autonome
CriteriaSubscription softwareCahier Autonome
Business modelRenewable monthly subscriptionOne-time payment
Data locationRemote servers (often outside EU)Only on your machine
Offline accessNoYes, fully
User account requiredYesNone
10-year costEUR 1,800 to 6,000EUR 185, once
Service shutdown riskHighNone
Data protectionDepends on the providerYour data stays with you
2026 e-invoicing reformDepends on software updatesCompliant with the new requirements
Learn everything
The documentation de fond.
Three long guides to fully understand before you buy.
- 01Pillar guide — Phase 1
Subscription-free software: the complete 2026 guide
Why the subscription software model costs you 4 times more over 10 years. Anatomy of a Cahier Autonome, comparisons, use cases by profession.
18 min read - 022026 reformUpcoming
2026 e-invoicing: understand it and comply without a subscription
Official schedule, PDP, obligations for small businesses and self-employed. How to comply without depending on subscription software.
22 min read - 03ComparisonUpcoming
Alternative to subscription invoicing software (Henrri, Indy, Pennylane): an objective guide
Detailed comparison of pricing, data, protection, compliance. Why move away from subscription invoicing software in 2026.
15 min read
FAQ
The questions you ask yourself.
You buy a Cahier Autonome (1 standalone file). You download it. You open it in Chrome, Safari, Firefox or Edge. It works immediately. Your data is stored locally in your browser, exportable to JSON at any time. No account, no subscription, no cloud.
Yes. You pay once. You own the file. It will never break because a server shuts down. You can back it up, copy it, send it to your accountant. There is no usage limit, neither in time nor in volume. No surprises on your bank statement.
You can re-download it from your purchase account. For your data, the file automatically exports to JSON, a text format you can store on Dropbox, Drive, or a hard drive. You choose where. Backup is under your control.
You sync the file like any document: Dropbox, Drive, iCloud, NAS. On each open, the state is restored from the file. You remain the only one to access it.
Yes. Your data never leaves your machine, so there is no transfer, no third-party processing, no server-side leak risk. You stay in full control.
Bug fixes and minor new features are included in your purchase. For major upgrades, you may optionally subscribe to annual maintenance at EUR 12 per year. Without maintenance, your file keeps working indefinitely.
Your data belongs to you. You export to JSON and PDF. No lock-in. No retention. You leave whenever you want with all your data intact. The opposite of classic subscription software.
Those are subscription software: you pay a monthly fee, your data lives on their servers, you depend on their availability. Cahier Autonome is a file you own: one-time payment, local data, lasting operation. Both models have their advantages, ours is designed for independence.
Own your tools.
Once and for all.
Join the professionals who chose to take back control of their tools, their data, and their monthly bill.
The whole site
Direct access to every section.
Catalog by profession
Long guides