Privacy Policy

Last updated: 27 October 2026.

SleepCycleCalc is designed to need as little of your information as possible.

What the calculators do with your input

Every calculation on this site runs locally in your web browser using JavaScript on the page. The times and numbers you enter are not sent to, stored on, or logged by any server operated by us. There are no user accounts, so there is no profile, password, or sleep history for us to keep.

Hosting and basic logs

The site is served as static files by our hosting provider (Cloudflare Pages). Like any web host, it may process standard technical request data (such as IP address and browser type) transiently to deliver pages and protect the service. We do not use that data to build profiles.

Cookies and analytics

SleepCycleCalc does not set advertising or cross-site tracking cookies. If privacy-respecting, aggregate analytics are enabled in future, this policy will be updated before they run.

Third parties

We do not sell personal data — we have none to sell. Outbound links (for example to other calculators in our family) lead to sites with their own policies.

Children

The site provides general educational information about sleep and is not directed at children under 13.

Changes and contact

Material changes to this policy will be posted on this page with a new date. Questions can be sent via the contact page.