Sleep Debt Clock Privacy Policy
Effective date:
Sleep Debt Clock (“the app”) is made by Linear B LLC. This policy explains what the app accesses, what it does with that information, and your choices. The short version: the app reads your sleep data from Apple Health to calculate your sleep debt on your iPhone, and nothing leaves your device.
Information the app accesses
Apple Health sleep data. With your permission, the app reads Sleep Analysis data from Apple Health (the times you were asleep, as recorded by an Apple Watch or another sleep-tracking app). It uses this data only to calculate and display your nightly sleep and your running sleep-debt balance.
The app only reads sleep data. It never writes to, changes, or deletes anything in Apple Health.
Settings you enter. The app stores your sleep goal, tracking start date, starting debt, and any estimates you enter for nights with no sleep data. These are saved only on your device.
Information the app collects
None. The app has no accounts, no servers, no analytics, no advertising, and no third-party code. We do not collect, receive, store, or have any access to your Health data or any other personal information. All processing happens on your iPhone.
Sharing
Because we never receive your data, we have nothing to share. Your Health data is never sold, shared with third parties, or used for advertising, marketing, or data mining.
Data retention and deletion
Your data stays on your device for as long as the app is installed. Deleting the app removes the settings and estimates it stored. Your sleep data remains in Apple Health, which you control.
Standard iPhone backups (iCloud or computer) may include the app’s settings. These backups are managed by Apple and by you, not by us.
Your choices
You can turn off the app’s access to your sleep data at any time: open the Health app, tap your profile picture, then Apps › Sleep Debt Clock. You can also delete the app at any time.
Sample data
The app’s optional “Try with Sample Data” mode shows generated example nights. That data is created on your device, isn’t read from or written to Apple Health, and disappears when you exit sample mode or close the app.
Children
The app is not directed at children under 13 and does not knowingly collect information from anyone, including children.
Medical disclaimer
Sleep Debt Clock is for general wellness and informational purposes only. It is not a medical device and does not diagnose, treat, or prevent any condition.
Changes to this policy
If this policy changes, the updated version will be posted on this page with a new effective date.
Contact
Questions about this policy? Please contact us using our contact form.