Privacy Policy

None that identifies you, unless you contact us. BuildNumerics does not ask for your name, email address, phone number or any account details to use the site, and there is no login.

If you send a message through the contact page, the name, email address and message you enter are emailed to the BuildNumerics inbox (delivered by our email provider, Resend) so we can read and reply to it. They are used for nothing else and are never sold or shared for marketing.

Like every website, the service that hosts BuildNumerics automatically receives standard technical request information when your browser loads a page — your IP address, the page requested, the date and time, your browser and operating system type, and the referring page. This is used only to serve the site, keep it available and protect it from abuse. We do not combine it with anything else or use it to build a profile of you.

• No accounts or passwords, and no contact details unless you send us a message.
• No cookies of any kind.
• No analytics, measurement or session-recording tools.
• No advertising, ad networks or ad identifiers.
• No third-party trackers, pixels, social widgets or embedded content.
• No location data beyond the coarse region implied by an IP address in server logs.
• The values you type into a calculator are never transmitted anywhere.

BuildNumerics uses your browser's local storage (not cookies) to remember a few things between visits. This data stays on your device, is readable only by BuildNumerics in that browser, and is never uploaded:

• Favorites — the calculators you star.
• Recently used — calculators you have completed a calculation on, so they appear on the homepage.
• Saved calculations — for each one you save: the calculator, its version, the unit system, the input values and units you entered, and both the exact and recommended results.
• Preferences — your imperial/metric choice, light/dark theme, recent search terms, and whether you have dismissed the “install app” prompt.

You can clear all of it at any time by clearing site data for BuildNumerics in your browser settings, or by using the “Clear” and delete controls within the app. Clearing it removes your favorites, history and saved calculations permanently, because we hold no copy.

The numbers you enter — dimensions, prices, load values — are processed only in your browser to produce a result. They are not logged or sent to a server. If you choose to save a calculation, it is written to your browser's local storage as described above and stays there until you delete it.

BuildNumerics sets no cookies. It uses local storage for the preferences listed above, and a service worker cache (below) so the app works offline. Neither is used for tracking.

There is currently no analytics provider and no advertising on BuildNumerics. If that changes, this policy will be updated first, the tool used will be named here, and a privacy-respecting option will be chosen.

The web fonts are downloaded when the site is built and served from BuildNumerics's own domain, so loading a page makes no request to a font provider or other third party. The site is delivered by a hosting provider (currently Vercel), which processes the standard request information described above in order to serve the pages.

BuildNumerics can be installed to your home screen. A service worker caches the app shell and the calculators you have opened so they keep working with no connection. The cache lives in your browser, contains only BuildNumerics's own files, and is cleared when you clear site data or uninstall the app. A new version never activates without your confirmation.

Calculator pages link to external references — standards bodies, manufacturers, code resources — as citations for their formulas. Those links open in a new tab. Once you leave BuildNumerics, the privacy policy of the site you visit applies; we have no control over and take no responsibility for those sites.

We keep no personal data, so there is nothing for us to retain or delete on your behalf. The data stored locally in your browser is retained until you clear it. Hosting request logs are retained by the hosting provider for a short period under their own policy and then discarded.

BuildNumerics is a professional construction tool and is not directed to children under 13. It collects no personal information from anyone, children included.

Pages are served over HTTPS. Because BuildNumerics holds no accounts and no personal data on a server, there is no user database to breach. Data kept in your browser is protected by your device and browser security.

If this policy changes, the effective date above will be updated and the change will be reflected on this page. Material changes — for example, introducing analytics — will be described plainly.

Questions about this policy, or about privacy on BuildNumerics, can be sent through the contact page.