Privacy policy

Last updated 4 November 2026. Sumwise is operated by the Sumwise team.

What you type

Every calculation runs in your browser. The numbers you enter are never sent to us. When you use “Copy link”, your inputs are put in the page address so you can share them; they go only where you send that link.

Analytics

We may count page views with Cloudflare Web Analytics, which uses no cookies and does not identify you. Our host, Cloudflare, keeps standard server logs (IP address, browser, time) for security.

Advertising

We do not currently show ads or set any cookies. If we add advertising, this page will be updated first and you will be asked for consent where the law requires it.

Affiliate links

Some pages link to products we may earn a commission from. These links are marked “Sponsored”. The partner may set its own cookies once you visit its site.

Your rights

Under the GDPR and UK GDPR you can ask what data we hold about you, and ask us to delete it. We hold none beyond the logs above.