Privacy Policy

Sensor Toolkit · Last updated: May 7, 2025

Sensor Toolkit ("the app") respects your privacy. This policy explains what information the app collects and how it is used.

1. Permissions and Their Purpose

Permission	Tool	Purpose	Transmitted to server
Microphone `RECORD_AUDIO`	Sound Meter	Measures ambient sound levels in decibels. Audio is processed on-device only and is never recorded or saved.	No
Location `ACCESS_COARSE_LOCATION` `ACCESS_FINE_LOCATION`	Compass, Heading	Required by the OS for compass heading access. Location coordinates are not used, stored, or transmitted by the app.	No
Motion sensors	Level, Vibration, Magnetometer	Reads accelerometer and magnetometer data in real time for on-screen display. Not transmitted to any server.	No
Vibration `VIBRATE`	All tools (haptics)	Provides tactile feedback in response to user interactions.	No
Storage `WRITE_EXTERNAL_STORAGE`	Sound Meter, Vibration	Saves measurement chart images to the device gallery. Required on Android 9 and below only.	No
Wake lock `WAKE_LOCK`	All tools	Keeps the screen on while a measurement session is active.	No

2. Automatically Collected Data (Third-Party SDKs)

Firebase Analytics / Crashlytics / Performance (Google LLC)

Collects crash reports, anonymous usage events, and performance metrics.
No personally identifiable information (name, email, phone number) is collected.
Data is sent to Google servers. Google Privacy Policy →

Google AdMob / UMP (Google LLC)

Displays ads to keep the app free. No ads are shown inside measurement screens.
Ad personalization is chosen by the user at first launch (GDPR/ATT consent).
AdMob may use device advertising ID and general device information. AdMob Policy →

3. Data Retention and Deletion

Data stored locally on your device:

Measurement history (local database) — deleted when the app is uninstalled.
Preferences (language, calibration settings, etc.) — deleted when the app is uninstalled.

The app does not store personal data on any server, so no server-side deletion is required. For additional requests, please contact us at the email below.

4. Children's Privacy

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

5. Changes to This Policy

We may update this policy. For significant changes, we will notify users via app release notes and update the "Last updated" date on this page.

6. Contact and Data Deletion Requests

Developer: Hangik Lee

Email: hangik.lee@gmail.com

For privacy inquiries or data deletion requests, please email us and we will respond within 30 days.