Trust
Privacy
The short version: your files never leave your device, your inputs stay in your browser, there are no accounts, and the only analytics is anonymous, aggregate usage counting. This page states exactly what that means so you can trust the tool with client models.
Your files are processed locally
What is stored, and where
Calculator inputs and small preferences (such as your last-used settings) are saved to your browser’s local storage so the tool remembers them between visits. This data lives only on your device. Clearing your browser data removes it. Nothing is synced to an account or a server, because there are no accounts.
What analytics sees — and does not
This site uses Vercel Web Analytics to count visits and understand which tools are used, in aggregate. It does not use advertising trackers and does not build a profile of you. Critically, analytics never receives your files, filenames, customer names, or the numbers you type into the calculators. Events are coarse and anonymous — for example, that a calculation happened — not what it contained.
What we never do
- Upload, store or transmit your files or their contents.
- Require an account, email address or signup to use any calculator.
- Sell or share personal data — there is essentially none to share.
- Put your customer or file identifiers into URLs or analytics.
- Use the accurate cost maths as a paywall.
Your control
Export a portable copy or delete every saved calculator value and site preference directly below. You can also clear this domain in your browser settings. Because everything is local, there is nothing to request deletion of from a server.
The export is a readable JSON file. Delete affects only this site's calculator data and theme on this device.
Changes
Last updated 25 July 2026. Questions about how a specific feature handles data are answered in the methodology, which documents file parsing in detail.