Privacy and data

Last updated: 11 November 2026.

What this site collects

The calculators run in your browser. Values entered in ordinary calculators are not sent to our servers. We do not require an account, collect payment details, operate a newsletter, or run third-party advertising or analytics scripts at launch.

Local browser storage

The subscription audit stores subscription names, amounts and billing periods in your browser's local storage so your list is there when you return. The daily challenge stores your last completed date and streak locally. This data stays on your device and is not uploaded to our website. You can remove it by clearing this site's browser data.

Technical server logs

Our web server may record standard technical access and error information, including IP address, requested URL, device or browser details and timestamps. This is used for site security, troubleshooting and reliability. It is not used by us to build an advertising profile. Hosting and retention arrangements are managed by the website operator.

Cookies and advertising

Our new public pages do not intentionally set tracking cookies. If we add advertising, analytics or affiliate technology in the future, we will review consent requirements, update this notice and clearly label commercial links as appropriate.

External links and contact

Links to other websites have their own policies. The site is operated by Mode-X Digital Development; business contact information is available at mode-x.co.uk. Contact the operator there about privacy questions or correction requests.