Privacy policy

The site requires no registration, creates no user accounts, and does not sell data. You only tell it what you type in yourself: your name and email in a form, the text of a comment. The site also runs a Google Analytics visit counter — more on that below. With rare exceptions, the tools and calculators compute right in the browser — what you enter into them never reaches the server.

Contact form

Name, email, and message text. The message is sent to the author as a notification and is not stored anywhere on the site: it is a way to reach a person, not a lead management system. Your email is used only to reply.

Comments

Name, optional email and website address, comment text, and date. Your name and comment are visible to everyone; your email is never published. A fingerprint of the address and browser is saved with the comment—not the actual values, but an irreversible hash of them. It is used to block spam, and neither the address nor the browser can be recovered from it.

Tools and calculators

Most tools calculate in your browser: anything you enter stays on your device. The few that need a server—redirect checks, analyzing someone else's page, and crawling a site—send only the address you entered and do not retain anything after responding. Each such tool states this clearly on its page.

Visit statistics

Google Analytics. It sets its own cookies and sends Google the pages you open, where you came from, your device type, browser, and approximate location by IP address. We need this to understand what people use on the site. The counter never receives names, emails, or text from forms. You can turn it off with a single button on the cookie policy page.

Our own ad blocks

The site’s ads are its own; there are no third-party ad networks. To avoid counting the same person twice in one day, we store an irreversible fingerprint—the same technique used for comments—which is kept for three months. It does not identify an address, browser, or person.

Comments — as long as the post they were written on exists: they are part of the conversation, and deleting it retroactively would be wrong. Ad impression fingerprints — three months. Emails from the contact form — not at all, they are not stored. Visit statistics are stored by Google Analytics under its own rules. Everything else lives in your browser and disappears when you clear it.

You can ask us to delete your comment or find out exactly what data about you is stored. Write through the contact form—I usually reply the same day. There is no separate department or request form: one person runs the site.