Privacy policy
Kalkio is a set of calculators and converters that run in your browser. You don't create an account, you don't give us any personal details, and we don't use cookies.
Who is responsible
The data controller is [Imię i nazwisko]. Contact: kontakt@kalkio.app.
What data we process
Numbers in the tools
The values you enter are processed only in your browser and are never sent to a server. If you use Copy link, the chosen units and value are added to the page address. The server only receives them when someone opens that address.
Technical data
Every visit sends standard information to the server, such as your IP address, browser type and the page address. The site is delivered by Cloudflare, Inc., which processes this data to serve the pages and protect them from attacks. The legal basis is our legitimate interest (Article 6(1)(f) GDPR).
If you email us, we process your address and message to reply (Article 6(1)(f) GDPR). We keep messages only as long as the matter requires.
Cookies and browser storage
The site doesn't use cookies. If you switch between light and dark mode, your choice is saved in your browser's local storage on your device and is never sent anywhere. You can remove it by clearing this site's data in your browser settings.
Analytics and ads
We currently use no analytics tools and no ads. If that changes, we will update this policy before turning them on.
Transfers outside the EEA
Cloudflare may process technical data outside the European Economic Area, including in the USA, under safeguards provided by the GDPR, such as standard contractual clauses.
Your rights
You have the right to access, correct and delete your data, to restrict its processing and to object to it. You can also complain to the Polish data protection authority, the President of the Personal Data Protection Office (uodo.gov.pl), or to the authority in your country.
Last updated: 15 October 2026.