Cookie policy
What a cookie is
A cookie is a small file a site keeps in your browser to remember something between visits. Alongside cookies there are similar mechanisms, such as local storage (localStorage), which this site uses far more than actual cookies.
What we use and why
Technical and functional storage (no consent required)
- Your light, dark or automatic theme preference.
- Your favourite calculators and your recent calculation history.
- Your decision about this very cookie policy.
All of that lives in your browser's localStorage. It never leaves your device, we never receive it, and we cannot read it from our servers. Clearing your browser data removes it.
Admin panel session cookie
It is only created if you sign in to the site's administration area, and its sole purpose is keeping you logged in. It is a technical cookie, flagged HttpOnly and SameSite, and it expires when you log out or after a period of inactivity.
Aggregate measurement (you can refuse this)
We count how many times each calculator is visited and used. It is a counter per tool and language: we do not store your IP address in clear text, nor identifiers, nor the values you type. It cannot be used to work out who you are or what you calculated.
What we do not use
- No advertising or social network cookies.
- No third-party trackers or tracking pixels.
- We do not share data with advertisers or data brokers.
- We do not build user profiles.
Changing your choice
You can review your decision at any time from the “Cookie settings” link in the footer. You can also delete everything we have stored from your browser settings, or from this site's own clear-history button.
If we ever add third-party advertising or analytics, this page will be updated before they are switched on and you will be asked again.
Last updated: 22 August 2026