Expert
The complete toolbox, including the most advanced modules.
Expert gives you every module on the site, from everyday checks to the most specialised ones, each with its calculation note.
- Cancel at any time
- Secure payment with Stripe
- Invoice for every payment
What the Expert plan adds
The most advanced modules
Specialised checks for complex structures, with the same transparent trail.
Calculation notes included
Every module produces its note in the same layout.
Everything in Pro
All free, Basic and Pro modules.
Modules in the Expert plan
On top of everything in Pro.
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Shear wall
Racking resistance of a sheathed timber-frame wall: fasteners, sheathing and anchorage.
Every value traceable to its clause, every module checked
Every plan uses the same modules, with the same care behind every result.
Every step with its clause
Each intermediate value sits beside the clause, equation or table it comes from, so the result can be checked line by line.
Swiss SIA standards
Calculations follow the SIA codes; other references appear only where a clause points to them.
Checked before release
Each module is checked clause by clause against the norm, and against independent calculations used on real projects.
Inputs explained
Every input shows its unit and what it means, with a figure wherever it makes the value clearer.
Your inputs are not kept
Each calculation runs on our server over an encrypted connection. Your inputs and results are not stored: they exist only while the calculation runs.
One layout everywhere
Inputs, results and figures in the same three columns in every module: learn it once.
Three steps, about two minutes
Create your account
Your name and e-mail address. We send a code to confirm it: no password to remember.
Confirm and pay
Check your plan and billing period, then pay on Stripe's secure page. Your plan opens the moment the payment is done.
Print your first note
Back in any module, click Calculation note. Print it or save it as PDF; your title block is remembered on your computer.
Compare the plans
| Free | Basic | Pro | ExpertThis plan | |
|---|---|---|---|---|
| Free modules, full calculation trail on screen | Included | Included | Included | Included |
| Calculation notes for every module | Not included | Included | Included | Included |
| Modules marked Basic | Not included | Included | Included | Included |
| Modules marked Pro | Not included | Not included | Included | Included |
| Modules marked Expert | Not included | Not included | Not included | Included |
| Account | Not needed | Yes | Yes | Yes |
| Price | CHF 0 | CHF 19 per month | CHF 59 per month | CHF 129 per month |
| Basic plan → | Pro plan → |
Questions before you start
Can I cancel at any time?
Yes. In your account, open Manage billing and cancel. The plan stays active until the end of the period you have paid for, then your account returns to Free. There is no further charge, and payments already made are not refunded.
What does “3 months free” mean?
With yearly billing you pay for 9 months and use the plan for 12. For this plan: CHF 1,161 per year instead of CHF 1,548.
Can I change plan later?
Yes, at any time from your account: move up to a larger plan or down to a smaller one.
How do I pay?
By card, and by Apple Pay or Google Pay where your device offers them, on Stripe's secure payment page. We never see or store your card number.
Can my company pay? Do I get an invoice?
Yes. Enter the company name and address at payment; every payment produces an invoice you can download from your account.
Where are my calculations stored?
Nowhere. The modules calculate on our server and send the result straight back; the inputs and results are not stored or logged. Your account stores only your name, e-mail address, company, country and plan.
Can colleagues share my account?
No. Each plan is for one engineer, and an account can be used on one computer at a time. A colleague who uses the tools needs an account of their own.
Do I need to install anything?
No. Any current browser on a computer or tablet is enough.
Ready when you are
Monthly or yearly: you confirm it on the next step, before paying.
CHF 129 per month · CHF 1,161 per year
Create account