Privacy policy

The calculators run in your browser. The numbers you enter are not sent to us or stored anywhere. The site has no accounts, no forms and no advertising.

We use Google Analytics to count visits and see which pages are useful. It sets cookies and receives your IP address, browser and device type, referring page and the pages you view. Google processes this data on our behalf under its privacy policy. You can block these cookies in your browser settings or with the Google Analytics opt-out add-on; the calculators work the same without them.

The site is hosted by Vercel, which keeps standard server logs (IP address, time and requested page) for security and operation.

The app has no accounts or sign-in. Calculation inputs, results and saved projects are stored only on your device using Apple's on-device storage. They are not sent to us, and they are deleted when you remove them in the app or uninstall it. If iCloud Backup is on, they may be included in your personal backup, which Apple controls.

The free version shows ads served by Google AdMob. Where the law requires it, the app first asks for your consent through Google's consent form, and Apple's App Tracking Transparency prompt asks before the advertising identifier (IDFA) is used. If you decline, ads may still appear but are not personalised.

AdMob may process your device's advertising identifier, IP address, approximate location derived from it, and ad interaction data, as described in how Google uses information from apps that use its services. You can change tracking permission at any time in iOS Settings → Privacy & Security → Tracking. The one-time Pro purchase removes all ads.

Purchases are handled by Apple through the App Store. We do not receive your payment details or Apple ID; Apple reports only aggregated sales figures that do not identify you.

Neither the site nor the app is directed at children, and we do not knowingly collect personal data from them.

If you are in the European Economic Area or the United Kingdom, you have the right to access, correct or delete personal data, to object to or restrict its processing, and to withdraw consent at any time. We hold no personal data on our own servers; data processed by Google or Apple is managed through their account and privacy tools. You can also lodge a complaint with a supervisory authority — in Latvia, the Data State Inspectorate.

When this policy changes, the new version is published on this page with a new date.