Privacy

Your calculation inputs never leave your browser

Every calculator runs locally on your device. The numbers you type — dimensions, tolerances, measurements, production figures — are never transmitted anywhere. This is not a policy promise you have to take on trust: the analytics events described below carry only the identifier of the tool you used, never its inputs or its results, and the site's source is public.

No accounts, no sign-up

There is no registration, no login, and no user profile. We do not ask for your name, email address, employer, or any other identifying detail in order to use any tool.

What stays on your device

Some conveniences are stored in your browser's local storage and never sent to us: saved input presets, recent calculation history, and whether you have already given feedback on a tool. Clearing your browser's site data removes all of it. We cannot read it.

Analytics

The site uses Google Analytics 4 to understand which tools are used and which pages are worth improving. It is loaded lazily — only after your first interaction with the page, or after the browser goes idle — so a visitor who reads and leaves may never load it at all. Three kinds of event are sent, and nothing else.

• A page view containing the page path and title
• A tool-used event containing only the tool's identifier, never its inputs or results
• A feedback event, sent only when you deliberately rate a tool, containing the rating, a fixed reason code, and any short free-text comment you typed — so please do not put confidential or personal information in that box

Third parties

Google Analytics is the only third-party service the site loads. There are no advertising networks, no trackers beyond that analytics tag, and no data broker relationships. We do not sell, rent, or share usage data. Questions about this page can go to [email protected].