Privacy Policy

Sleep Sine is designed to do one thing well: play ambient scenes for sleep. The app collects nothing about you. The marketing website at sleepsine.com uses minimal analytics, disclosed below. This policy explains what that means in detail.

Information we don't collect

Sleep Sine has no servers, no accounts, no analytics, and no third-party SDKs that report on you. The app does not transmit usage data, scene choices, listening history, device identifiers, or any other personal information to us or anyone else.

What stays on your device

Everything you do in Sleep Sine — saved presets, the active scene, your slider configurations — stays on your device. If you sign in to iCloud, your saved presets sync across your own devices via Apple's iCloud service (Sleep Sine never sees this data; it travels through your iCloud account, encrypted by Apple).

What Apple sees (not us)

When you download or purchase Sleep Sine, Apple processes the App Store transaction and the Sleep Sine in-app purchase. Apple's privacy policy applies to anything they collect — see apple.com/legal/privacy. Sleep Sine receives only an entitlement token (i.e. "this device has purchased the unlock") and never sees your name, email, payment method, or any other personal information.

Shared codes and the website

Sleep Sine lets you share a 12-character code (e.g. GAR5P2-KM7EX1) that encodes your scene + slider values. When you share that code, it can be opened directly in the app, or via a link like https://sleepsine.com/s/GAR5P2KM7EX1.

The website at sleepsine.com is hosted on Cloudflare. Cloudflare may log standard technical request data (IP address, user agent, request path) for the purpose of serving the site and protecting against abuse — see Cloudflare's privacy policy for what they retain.

Website analytics

The marketing pages at sleepsine.com use Google Analytics 4 (gtag.js) to count pageviews and understand which scenes resonate with visitors. To do this, Google sets first-party cookies named _ga and _ga_* in your browser.

Analytics events include the page you visited, your approximate location (derived from your IP address, which Google then discards), the device and browser you're on, and how you arrived at the site (the referring link). They do not include your name, email, or anything from inside the Sleep Sine app — the app itself never talks to Google.

To opt out, install Google's Analytics Opt-out Browser Add-on, enable a tracker blocker, or block googletagmanager.com via a content blocker like uBlock Origin. For details on what Google collects and how long they retain it, see Google's privacy policy.

Children

Sleep Sine is rated suitable for all ages and doesn't collect any data that could be used to identify or contact a child. The app does not contain advertising, third-party links, or content sharing.

Changes to this policy

If we ever change how Sleep Sine handles data, we'll update this page and bump the "Last updated" date above. Substantive changes (e.g. introducing any data collection at all) would be announced in the app's release notes before taking effect.

Contact

Questions or concerns? Email support@sleepsine.com.