UnitPad by Structona
A working calculation sheet. Free.
The full calculation engine, saving, and PDF export are free, in the browser and on the desktop. Pro adds advanced PDF settings, your branding, Excel and Mathcad, and AI Connect.
Included, including commercial work
The calculator is not a trial of itself.
No account and no card. The browser app and the desktop installers stay open.
Browser and desktop
The same light sheet in the browser or as a desktop app. Start in the browser. Install the desktop app when you want a window of your own.
Results as you type
Change an input and every line below updates. The value stays beside the formula. A new calculation is short text you can write, copy, and reuse.
A full calculation engine
Units, functions, conditionals, vectors, plots, tables, derivatives, and integrals. Adding a force to a length is an error, not a quiet wrong number.
Plots, tables, and a report
A plot or a table is another line on the sheet. Headings, formulas, and results export to PDF with the default layout. A small “Created with UnitPad” footer stays on Free.
Yours to keep
Example sheets cover common calculations. Files are plain text on your device. Move, add, and rewrite lines without rebuilding the document.
Beam design
M_max 112.5 kNm
V_max 75 kN
Pro
Deliverables and automation. Not a second calculator.
The engine, saving, local files, and the desktop install stay on every plan. Pro is what you hand over, and what you connect.
Advanced PDF settings
Table of contents, lists of figures and tables, fonts, sizes, colors, and widths.
Your branding
Custom logo, without the UnitPad footer. The sheet is still the report.
Your office
Beam design
Contents 1
M_max 112.5 kNm
Excel and Mathcad
Export to Excel or Mathcad Prime, and import a Mathcad worksheet instead of rebuilding it.
Extra example sheets
Structural templates beyond the free samples. One named user, on monthly, yearly, or lifetime.
- beam_design.xlsx
- beam_design.mcdx
- beam_design.upad
AI Connect
On the desktop, connect an assistant and drive the sheet from it. A draft lands on the page. You accept or reject each change. The browser app stays calculation-only.
Suggested edit
M_max = q*L^2/8
112.5 kNm
AcceptReject
Why it stays small
Private, flexible, and priced as a tool.
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Privacy
Calculation files stay on your device, in the browser and in the desktop app. An account, when you want Pro, stores the email you sign in with and the plan. It does not store the sheet.
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Flexibility
Plain text you can copy. The same sheet in the browser or on the desktop. Installers and updates stay open on every plan. Leave, and the file is still yours.
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Pricing
Free is a working tool, including commercial work. Pro is the branded PDF, Excel and Mathcad, and AI Connect on the desktop. Far below a calculation suite.
Compared
The working sheet, without the suite.
Public editions. UnitPad is the one you can use for real work in the browser and on the desktop, with the formula still on the page, before you pay.
| What you need | UnitPad | SMath Studio | Calcpad | Mathcad Express | Spreadsheets |
|---|---|---|---|---|---|
| Free, including commercial work | Yes | Limited | Yes | No | Paid |
| No account to calculate | Yes | Yes | Yes | No | No |
| Browser and desktop | Yes | Desktop | Limited | Windows | Yes |
| Unit checks | Yes | Yes | Yes | Limited | No |
| Formula stays on the page | Yes | Yes | Yes | Yes | No |
| PDF from the sheet, no watermark | Pro | Yes | Yes | No | No |
| Files stay on your device | Yes | Yes | Yes | Yes | Limited |
| AI on the open sheet | Pro | No | No | No | No |
| Branded PDF, Excel, and Mathcad | Pro | Limited | No | Paid | Limited |
UnitPad is the sheet that is free for commercial work, in the browser and on the desktop, with units and a report included. Pro is the branded PDF, Excel and Mathcad, and AI Connect. A suite license is not required to calculate.
Pricing
Free to calculate. Pro to deliver.
Prices in EUR. Checkout shows your currency and adds VAT.
Free
€0
- Full calculation engine
- Saving and PDF export
- Browser and desktop
- No account, no card
Pro monthly
€12 / month
- Advanced PDF and branding
- Excel and Mathcad
- AI Connect
- Cancel when you want
Pro yearly
€99 / year
- Everything in Pro monthly
- About 31% off twelve months
- One named user
- Best for a working year
Limited offer. Pro lifetime is €249 once. The same Pro features, later product updates, one named user. Open UnitPad
A 7-day Pro trial includes every Pro feature — an account, no card. 14-day refund on the first paid purchase.
Free includes the engine, saving, and PDF export. Start in the browser.
Open UnitPad