Sleep Wind
Privacy
Last updated 6 September 2026 · applies to Sleep Wind for iPhone, version 1.0
Sleep Wind has no servers. It has no accounts, no analytics, no advertising and no third-party SDKs of any kind. It contains no networking code, so there is nowhere for your information to go, and this policy is short because there is very little to describe.
Sleep history from the Health app
If you grant permission, Sleep Wind reads one kind of data from Apple Health: your Sleep Analysis records — the bedtimes, wake times and sleep stages your watch or another app has already written there. It reads the last 90 days.
What it does with them, entirely on your iPhone:
- Works out how long you usually take to fall asleep, so it can size how long the sound stays at full volume to you rather than to a round number.
- Looks for a point in the night where you tend to stir, so it can leave quiet cover there.
- Draws the charts on the Nights screen.
This happens in the app's own process, on the device. Health data is never transmitted anywhere, never sold, never used for advertising, and never shared with anyone — including us. We have no way to receive it.
Sleep Wind asks for read access only. It requests no permission to write, and it writes nothing back to Health.
Granting access is optional. Without it the app is a complete sleep-sound app — every sound, the wake ramp and the alarm all work; only the parts shaped to your own history are unavailable. You can withdraw access at any time in Settings → Privacy & Security → Health → Sleep Wind, or in the Health app under Sharing → Apps. Sleep Wind keeps no copy, so withdrawing it takes effect immediately.
What stays on your phone
Sleep Wind stores a small amount of information locally, in its own container:
- Your settings — the sound you chose, your alarm time and whether the alarm is on, and your choice of added tone.
- Playback records. While a night is playing, the app notes when it started and stopped, which sound was playing, the battery level, the audio route and the audio buffer size, about once a minute. This is how it can tell you in the morning whether the sound actually ran all night or died at 3 a.m. The most recent 30 nights are kept and older ones are deleted automatically.
None of this leaves the device. If you back your iPhone up to iCloud or a computer, it is included in that backup, in the same way as any other app's data, and is covered by Apple's protection of your backup. Deleting Sleep Wind deletes all of it.
Your purchase
Sleep Wind sells one thing: a single, one-time unlock. There is no subscription. The purchase is handled entirely by Apple through the App Store. We never see your name, your card, your address or your Apple Account — the app is told only whether the unlock has been bought, and nothing else. Apple's own privacy policy governs the transaction.
Your alarm
If you turn on Wake me, the time you set is handed to iOS so the alarm can break through Focus and silent mode and can fire even if the app is not running. It is held by the system on your device.
What Sleep Wind does not do
- No account, no sign-in, no email address.
- No analytics, telemetry, crash reporting or usage statistics.
- No advertising, no advertising identifier, no App Tracking Transparency prompt, because there is nothing to track.
- No third-party SDKs, no social logins, no embedded browsers.
- No location, contacts, microphone, camera or photo access. The app does not ask for them.
- No selling or sharing of personal information, under any definition, because none is collected.
Children
Sleep Wind is not directed at children under 13 and collects no personal information from anyone, of any age.
Changes
If a future version of Sleep Wind handles data differently, this page will be updated before that version is released, and the date at the top will change. Since the app has no servers, any change would have to arrive as an app update you choose to install.
Contact
Questions about this policy, or about anything the app does with your data: privacy@gritlearn.com.