Basic
Hand in a finished calculation note, not a screenshot.
Every module turns its calculation into a clean A4 note: title block, every step with its clause, the figures. Ready to file with the project, print, or send to the checking engineer.
- Cancel at any time
- Secure payment with Stripe
- Invoice for every payment
Every module, one click, a note ready to file
A note in one click
The Calculation note button opens a print-ready A4 document of the calculation on screen. Print it or save it as PDF.
A title block that fits your office
Project, element, note number, author, checker, date and revision, filled in once and remembered on your computer.
Every step, every clause
The same trail as on screen: formula, value, unit and clause, laid out to be read and checked on paper.
In every module
Each module of the site has its note, in the same layout, so a set of notes reads as one document.
Modules in the Basic plan
On top of everything in Free.
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Bearing at a support — fire situation
Compression perpendicular to the grain at a support in the fire situation, with the charred contact surface.
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Beam in biaxial bending — fire situation
Bending about both axes on the charred residual section, with lateral torsional buckling, in the fire situation.
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Column in compression — fire situation
Axial compression with buckling on the charred residual section, in the fire situation.
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Compression and biaxial bending — fire situation
Axial compression with bending about both axes on the charred residual section, in the fire situation.
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Bar in tension — fire situation
Axial tension on the charred residual section, in the fire situation.
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Beam in simple bending — fire situation
Bending about y-y on the charred residual section, with lateral torsional buckling, in the fire situation.
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Beam in shear — fire situation
Shear on the charred residual section and its interaction with stress across the grain, in the fire situation.
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Beam in torsion — fire situation
Torsion, alone or with shear, on the charred residual section, in the fire situation.
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Bar in tension and biaxial bending — fire situation
Axial tension with bending about both axes on the charred residual section, in the fire situation.
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 | BasicThis plan | Pro | Expert | |
|---|---|---|---|---|
| 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 |
| Pro plan → | Expert 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 171 per year instead of CHF 228.
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.
Your next check, as a note you can file
Monthly or yearly: you confirm it on the next step, before paying.
CHF 19 per month · CHF 171 per year
Create account