Privacy Policy

Effective date: June 9, 2026

Your calculator inputs

Every calculation on Calcmill runs entirely in your browser. The numbers you enter are never transmitted to our servers and are never stored by us — there is no account, no database, and no form submission anywhere on the site. Closing the tab erases everything.

What we store locally

The site keeps one preference in your browser’s localStorage: your light/dark theme choice. It never leaves your device.

Analytics

Calcmill uses Vercel Web Analytics, a privacy-friendly, cookie-free analytics service. It records aggregate page views and basic request context — page URL, referrer, country, and browser/device/OS category. It does not use cookies, does not collect or store IP addresses, and identifies visits only by a temporary anonymous hash that cannot track you across sites or days. Your calculator inputs are never part of this data — they never leave your browser. Details are in Vercel’s analytics privacy description.

Advertising

Calcmill uses third-party advertising (Google AdSense) to keep the calculators free. Google and its partners may set cookies and use device identifiers to serve and personalize ads, including based on prior visits to this and other websites. You can read how Google uses advertising data and opt out of personalized ads at policies.google.com/technologies/ads.

Hosting

The site is served by our hosting provider, which — like any web host — processes standard server logs (IP address, user agent, requested URL) to deliver pages and prevent abuse. We do not use these logs to identify visitors.

Contact

Questions about this policy: my.developer.js@gmail.com or via the contact page.