Privacy, in plain language.
This page describes the current version of Sleep Cycle Calculator at sleepcyclecalculator.net.
Your calculations stay in your browser
The calculator runs on your device. It does not send the times you enter, your falling-asleep allowance, or your calculated results to an application server. When you open the page, it reads your device’s date, time, and time zone locally to fill in a starting bedtime. It does not keep updating the clock while you plan. The site does not keep a sleep diary or sleep history.
There are no accounts, payments, or application databases. You do not need to provide a name or email address to use the calculator.
Preferences stored on your device
The site uses your browser’s local storage to remember time to fall asleep, time format, and your preferred wake-up time, under the key sleep-cycle-preferences:v1. These settings are restored on the same browser and device. Bedtime starts fresh from your device clock on each visit. These settings are not shared across devices or uploaded by the calculator.
Local storage is different from a cookie: the browser does not automatically send its contents with web requests. Preferences remain until you clear this site’s browser data or your browser removes them. Private browsing and storage restrictions may prevent preferences from being saved. The calculator remains usable without saved preferences.
Hosting and ordinary web requests
Opening any website sends a request to its hosting provider. That provider may process technical information such as your IP address, browser information, requested page, and request time to deliver and protect the site. Local calculation does not prevent that ordinary hosting activity.
We do not state a hosting-log retention period here because it depends on the provider and deployment settings.
Cookies, analytics, and advertising
This version does not set first-party cookies or load analytics or advertising services. The code includes inactive integration points for possible future use; these do not send data while disabled.
Before enabling analytics or advertising, this policy will need to identify the services and their data practices, and any required consent controls will need to be configured. No advertising identifiers are used by the current calculator.
Visiting links
Links to external sleep resources take you to websites with their own privacy policies.
Updates
Changes to these practices will be reflected on this page with a revised update date.
Published by Sleep cycle calculator · Updated