Privacy Policy

Information We Collect

We do not ask you to register, and the site has no login, comment, or account system. The values you enter into any calculator are processed entirely in your browser and are not transmitted to or stored on our servers.

We use Google Analytics for Firebase to understand how the site is used — for example, which calculators are visited, which tools run calculations, and which export features are used. This service collects standard usage data such as pages viewed, approximate location derived from your IP address, device and browser type, and anonymous usage identifiers stored in cookies or similar technologies. We use this data only in aggregate, to decide which calculators to improve and add.

Advertising & Google AdSense

This site displays advertisements served by Google AdSense. Third-party vendors, including Google, use cookies to serve ads based on your prior visits to this website or other websites. Google’s use of advertising cookies (including the DoubleClick cookie) enables it and its partners to serve ads to you based on your visit to this site and/or other sites on the internet.

You may opt out of personalized advertising by visiting Google Ads Settings. Alternatively, you can opt out of some third-party vendors’ use of cookies for personalized advertising by visiting www.aboutads.info/choices.

For details on how Google uses information from sites that use its services, see How Google uses information from sites or apps that use our services.

Cookies & Consent

Cookies on this site fall into two groups: measurement cookies set by Google Analytics for Firebase, and advertising cookies set by Google AdSense and its certified ad partners. Where required by law — including for visitors from the European Economic Area, the United Kingdom, and Switzerland — a consent message is shown before advertising or analytics cookies are set, and you can decline or change your choice at any time through that message.

You can also block or delete cookies through your browser settings at any time. The calculators themselves work fully without cookies.

Data Stored in Your Browser

Some tools save your preferences — such as custom material libraries or recent settings — using your browser’s local storage so they persist between visits. This data stays on your device, is never transmitted to us or to any third party, and you can remove it at any time by clearing your browser’s site data for reuven.tools.

Data Sharing & Retention

We do not sell, rent, or trade any information about you. Usage analytics are processed by Google on our behalf and retained according to Google’s standard retention periods. We hold no personal data ourselves: there is no database of users, emails, or calculation history on our side.

Children’s Privacy

This site provides professional engineering calculators and is not directed at children under 13 (or the equivalent minimum age in your jurisdiction). We do not knowingly collect personal information from children.

Your Rights

Depending on where you live, you may have rights to access, correct, or delete personal data, and to object to or restrict certain processing. Because we hold no personal data directly, such requests generally concern data held by Google; the opt-out links above and your browser’s cookie controls are the most direct remedies. For anything else, contact us and we will help where we can.

Changes to This Policy

If we change how the site handles data — for example, by adding a new analytics or advertising service — we will update this page and revise the date at the top. Material changes will be noted here explicitly.