Satwell Privacy Policy

Effective date: 2026-11-06

Satwell ("the app") is a free logbook for readings from your own fingertip pulse oximeter, provided by DDJ B1 ("we", "us"). You type in the blood oxygen (SpO2), pulse and optional temperature values your oximeter shows, and the app keeps them as a history, trend charts and reports. Satwell does not measure anything itself and does not use your phone's camera or sensors. It has no account system, no login, no subscription and no server operated by us.

Your data

Your readings, notes, context tags (for example "resting" or "on oxygen"), profile names, your personal threshold line and settings are stored locally on your device.

• The app itself does not upload this data, and we never receive it.
• The advertising SDK described below may collect information as explained in that section. Your readings, notes and profile names are not passed to the advertising SDK.
• "Doctor report (PDF)" and "Export CSV" create a file on your device. If you choose to share or save it, the file goes only to the app or location you pick through Android's share sheet or file picker, and stays under your control.
• If you use "Share", a short text goes only to the app you choose through Android's share sheet.
• Android's standard app backup may include app data in your own Google account backup if you have device backup enabled; that backup is controlled by you and Google, not by us.

Permissions

• Notifications — for optional reading reminders. You can decline or turn them off; everything else keeps working.
• Run at startup — to restore reminders after the phone restarts or the time zone changes.
• Internet / network state / advertising ID — used by the advertising SDK described below.

Satwell does not request location, contacts, camera, microphone, body sensors, phone call, SMS, calendar or photo library permissions.

Advertising and information collected automatically

The app displays advertisements provided by Google AdMob inside the app only (never in notifications or in the widget). No ads are shown on the screen where you enter a reading. Ads are limited to content rated for general audiences. To serve and measure ads and to prevent fraud, the AdMob SDK may collect and share with Google information such as your device's advertising identifier and other device identifiers, approximate location derived from your IP address, app interactions (for example ad views and taps), crash logs and diagnostics. This data is shared with Google as a third party for advertising, analytics and fraud prevention purposes. For more information see https://policies.google.com/technologies/partner-sites.

For users in the European Economic Area (EEA), the United Kingdom and other regions where required, the app presents a consent form via Google's User Messaging Platform (UMP) before personalized advertising data is used; if you decline, non-personalized ads are shown. You can change your choice from the app's Settings screen ("Ad privacy settings") and reset or limit ad personalization in your device settings.

Health information

Satwell is a record-keeping tool, not a medical device. It does not measure, diagnose, treat or prevent any condition, and the threshold line is a reminder value you set yourself. Always follow the plan your doctor or care team gave you, and seek medical help if you feel unwell, regardless of what the app shows.

Children

The app is not directed to children under 13, and we do not knowingly collect personal information from children.

Your rights

Your app data exists only on your device and in files you choose to export; uninstalling the app removes the app's own copies. You can edit or delete any reading inside the app at any time, or delete all data from Settings. Depending on your region (e.g. GDPR, CCPA), you may have rights regarding data processed by the advertising SDK; you can exercise ad-related choices through the consent form and your device's ad settings.

Changes to this policy

We may update this policy from time to time. Changes will be posted on this page with an updated effective date.

Contact

Questions about this policy: bloodturtle@naver.com