Last updated: 2026. This policy covers energy.calcmoon.com.

The short version

Everything you type into the calculators stays in your browser. We do not receive it, store it, or see it.

What we collect

Calculator inputs: never transmitted. The arithmetic runs in JavaScript on your device.
Preferences: your light/dark theme choice is saved in your browser's local storage. It never leaves your device and you can clear it at any time from your browser settings.
Analytics: we use Google Analytics 4 to understand which pages are useful. It records page views, approximate location (city level), device type and referrer. It does not receive your calculator inputs.
Advertising: third-party ad partners may set cookies to serve and measure ads. They do not receive calculator inputs from us.
Server logs: our web server records IP address, user agent and requested URL for security and abuse prevention, retained for a limited period.

Cookies

We set no first-party tracking cookies. Third-party analytics and advertising partners may set their own; you can block them in your browser without affecting any calculator.

Your rights

If you are in the EU, UK or California you have the right to access, correct or delete personal data we hold. Because we hold no calculator data, in practice this concerns analytics and server logs. Write to 1519556279@qq.com and we will respond within 30 days.

Children

This site is not directed at children under 13 and we do not knowingly collect data from them.

Changes

If this policy changes materially we will update this page and the date above.