Privacy Policy

Last updated: 16 October 2026.

The short version: All Sleep Calculators has no accounts and collects no personal data. Your tool inputs never leave your browser.

What we store

The only thing All Sleep Calculators stores is your tool preferences, such as your chosen sleep onset time or 12/24-hour clock format, in your browser's localStorage. This exists purely so the tools remember your settings between visits. It never leaves your device, and we cannot see it.

What we do not collect

• No accounts, so no names, email addresses, or passwords.
• No sleep data: your bedtimes, wake times, and other inputs are processed in your browser only.
• No contact details unless you email us yourself (see the contact page).

Advertising and analytics

All Sleep Calculators is supported by advertising. Ad slots on the site render only when advertising is configured through environment variables; when it is not configured, no ad code loads at all. If advertising is enabled in the future, the ad provider may use cookies to serve and measure ads, as described in the provider's own privacy policy.

The same applies to analytics: no analytics code runs unless it is explicitly configured. When enabled, it records only anonymous page-level events. Your sleep times and tool inputs are never sent to analytics under any configuration.

Cookies

All Sleep Calculators itself sets no cookies. Cookies may appear only from configured third parties, such as an advertising provider, and only when those services are enabled. A consent banner is shown in that case where required.

How to clear your data

To remove your stored preferences, clear your browser's site data for this website. In most browsers: open site settings for this site (usually via the lock or settings icon in the address bar), choose “clear data” or “delete site data,” and reload. That wipes the localStorage entries All Sleep Calculators created.

Changes to this policy

If this policy changes, we will update the date at the top of this page. Because we hold no contact details, we cannot notify you directly, so check back occasionally.

Questions about privacy? Email [email protected].