Privacy Policy
Last updated: August 2026
The short version
Your calculator inputs never leave your browser. We store your theme, favorites and recently used tools locally on your device. Analytics and advertising cookies are only used after you grant consent, and you can decline without losing any functionality.
Information we do not collect
We do not receive, transmit or store anything you type into a calculator. There are no accounts and no server-side calculation logs. Values like salary, weight or mortgage details exist only in your current browser tab.
Local storage
We use your browser's local storage for: your light/dark theme choice (uch-theme), saved favorite calculators (uch-favorites), recently used calculators (uch-recent-calculators) and your cookie consent choice (uch-consent). This data stays on your device and is never sent to us. Clearing your browser storage removes it permanently.
Analytics
If you accept cookies, we use Google Analytics 4 with IP anonymization to understand aggregate usage — which pages are visited and which events occur (e.g., “a calculation was completed”). Calculator input values are never included in analytics events. If you decline, no analytics scripts load at all.
Advertising
With consent we display ads via Google AdSense. Google and its partners may use cookies to serve ads based on prior visits to this or other websites. You can opt out of personalized advertising in Google Ads Settings. Declining consent simply means non-personalized or placeholder ads.
Contact form
Messages sent through the contact form are used solely to respond to you. We don't add you to mailing lists or share your email with third parties.
Your choices
You can withdraw cookie consent any time by clearing site data in your browser, which will re-show the consent prompt on your next visit. For any privacy question, contact us via the contact page.
Changes to this policy
If we change how data is handled, we'll update this page and the date above.