TrueBubble

Privacy Policy

Last updated: June 21, 2026

      TrueBubble is a spirit-level app that works entirely on your device. It has no internet access and transmits no data of any kind.
    

1. What TrueBubble Does

TrueBubble uses your device's built-in motion sensors (accelerometer and rotation vector sensor) to measure the tilt and orientation of your device and display it as a visual spirit level. All sensor processing happens locally on your device in real time.

2. Sensor Data

TrueBubble reads the following sensors to function:

Accelerometer — measures gravitational force along each axis to determine device tilt
Rotation vector sensor — provides a more accurate orientation estimate when available

Sensor readings are used only to render the level display. They are processed in memory and discarded immediately — they are never stored on disk or transmitted anywhere.

3. Data We Do Not Collect

TrueBubble does not collect, store, or transmit any data. Specifically:

No personal information of any kind
No sensor readings or measurement history
No location data
No usage statistics or analytics
No crash reports sent to our servers

4. Data Stored Locally on Your Device

TrueBubble stores the following data in your device's local app storage. This data never leaves your device:

Calibration offsets — if you calibrate the level on a known-flat surface, the correction values are saved locally so the app remembers them between sessions
App settings — your preferences (e.g. sound/vibration on/off, display options)

You can clear this data at any time by clearing the app's storage in your device settings, or by uninstalling the app. Note: TrueBubble explicitly opts out of Android's automatic backup system, so this data is never uploaded to Google's cloud backup.

5. Vibration

TrueBubble uses your device's vibration motor to provide haptic feedback when the device is level. This is a device-only feature and involves no data collection or transmission.

6. Network Access

TrueBubble does not request or use internet access or local network access of any kind. It functions entirely offline.

7. Third-Party Services

TrueBubble does not include any advertising SDKs, analytics libraries, or crash-reporting services. The app is distributed through:

Google Play Store — subject to Google's own privacy policy

8. Children's Privacy

TrueBubble is not directed at children under the age of 13 and we do not knowingly collect any personal information from children.

9. Changes to This Policy

If we update this Privacy Policy, we will post the revised version on this page with an updated "Last updated" date.

10. Contact

Questions about this policy? Contact us at privacy@spotrobotics.app