Privacy Policy

All calculations happen in your browser. We do not see the numbers you type. Your favorites, history, and inputs are stored on your device, not on our servers.

We use Vercel Analytics and Speed Insights to measure anonymous traffic (pages visited, approximate country, browser version, load times). These are cookie-less.

We do not sell, share, or rent any data to third parties. We do not run advertising at the moment.

Aggregated, anonymous analytics: page URL visited, referring site, approximate country (from your IP, not stored), device and browser type, Core Web Vitals (LCP, INP, CLS). Provided by Vercel Analytics and Vercel Speed Insights. No cookies, no fingerprinting.

Error reports: if the site crashes in your browser, the error message and stack trace may be logged to help us fix it. We scrub personal data from these reports.

We do not collect names, email addresses, phone numbers, or any personally identifying information, unless you voluntarily send us an email.

We do not see the inputs you type into any calculator. Calculations run locally in your browser.

We do not track you across other websites.

Favorites: a list of calculators you marked with a heart, stored in your browser via localStorage. Only visible on the device where you saved them.

History: a recent-calculations log stored in IndexedDB (via Dexie). Never leaves your device. Clearing your browser data removes it.

Theme preference (light/dark): stored in localStorage.

We do not currently use cookies. Vercel Analytics measures traffic without cookies. If this changes (for example when we enable advertising in the future), we will update this policy and display a consent banner.

Hosting: Vercel (vercel.com). Privacy: https://vercel.com/legal/privacy-policy.

DNS: Cloudflare. Privacy: https://www.cloudflare.com/privacypolicy/.

Fonts: Google Fonts (Inter, JetBrains Mono), self-hosted at build time so your browser does not contact Google.

We do not load analytics from Google, Meta, or similar trackers.

Under the GDPR (EU) and the LGPD (Brazil), you have the right to know what we collect, request a copy, request deletion, and withdraw consent. Since we collect only anonymous analytics, there is nothing linked to your identity to export or delete.

To clear data stored on your own device, open your browser settings and clear site data for quickusecalculator.com.

For any question, email us.

This site is not directed at children under 13 and we do not knowingly collect data from them. If you believe a child has sent us personal information (for example by emailing us), contact us and we will delete it.

If we change how we collect or use data, we will update this page and change the "Last updated" date at the top. Material changes will be announced on the home page for at least 30 days.

Email: contact-us@quickusecalculator.com

We aim to answer within a few business days.