Privacy Policy

The Short Version

• The numbers and dates you type into calculators are worked out in your browser. We don't receive them unless you choose to save a result.
• We keep basic visit statistics: page visited, IP address, browser type, device type, referring site, time, and which calculator was used.
• An account is optional. If you create one, we store your name, email, a scrambled (hashed) password and the results you choose to save, up to 30.
• Questions you type into the AI Assistant are sent to an AI provider to get an answer.
• We don't sell your data.

1. Information We Collect

Visit statistics (everyone)

When you open a page or run a calculator, our server records the page address, your IP address, your browser's user-agent text, whether you're on a phone, tablet or computer, the site that linked you here (if any), the date and time, and, if the site runs behind Cloudflare, your country. If you're logged in, the visit is linked to your account. We use this to see which tools are useful, fix problems and stop abuse.

Account information (only if you sign up)

Name, email address and a bcrypt-hashed password (we can't read your password). If you use Continue with Google, Google shares your name, email address and a Google account ID. We never see your Google password.

Saved results (only if you click Save)

The calculator name, the inputs on screen, the result text and the label you give it. You can delete any saved result at any time from My Account.

AI Assistant questions

When you use the AI Assistant or "Explain my result", your text is sent to Google Gemini or, as a backup, Groq to produce an answer. We don't store your question text. We record only that a request happened (time, IP address, success or failure) to enforce daily limits. Please don't type sensitive personal details into the AI Assistant.

Domain age lookups

The domain you enter is sent to the public RDAP registry service for that domain extension.

Security logs

Login attempts (email, IP address, success or failure) are kept to block password-guessing attacks.

Self-hosted analytics

This site uses first-party, self-hosted analytics (LinkYou Insights, running on our own server). It records your IP address, your approximate location (country, region and city, looked up locally from the IP address), the pages you visit and how long you spend on each page, plus basic technical details such as browser, device type, screen size, language and the referring website. A random visitor ID is kept in your browser's local storage instead of tracking cookies. This information is used only to understand and improve the site, detailed records are deleted automatically after a limited period, and it is never sold or shared with third parties.

2. Cookies

• AWSESS: a session cookie, set only when you log in, sign up or use account pages. It keeps you logged in and protects forms. It's deleted when you close the browser or log out.
• Google Analytics (_ga cookies): used to measure visits. Google's policy applies: how Google uses data.
• No advertising cookies are set by us. If ads are added later, this policy will be updated first.

3. How Long We Keep Data

• Visit statistics and security logs: up to 365 days, then deleted automatically.
• Password-reset links: expire after 60 minutes.
• Account and saved results: until you delete them or ask us to delete your account.

4. Who We Share It With

Only the services needed to run the site: our hosting provider, the AI providers (for AI questions only), Google (only if you use Google sign-in or through Google Analytics), and an email provider to send password-reset emails. We don't sell or rent personal data.

5. Your Choices and Rights

• Use every calculator without an account.
• Delete saved results yourself on the My Account page.
• Ask us to see, correct or delete your account data using the contact details below. Depending on where you live (for example the EU/UK under GDPR, or California under CCPA), you may have extra rights, and we'll honour them.

6. Security

Passwords are hashed with bcrypt, forms are protected against cross-site attacks, logins are rate-limited, and the site should be served over HTTPS. No system is perfectly secure, but we work to protect your data.

7. Children

The site is for a general audience. Accounts are not intended for children under 13, and we don't knowingly collect their personal information.

8. Changes

If this policy changes, we'll update the date at the top of this page.

9. Contact

Questions or deletion requests: email the site owner using the address shown on this site.