Privacy Policy

Last Updated: February 8, 2026

Introduction

This Privacy Policy describes how our bike tire pressure measurement application ("the App") collects, uses, and protects your information. We are committed to protecting your privacy and being transparent about our data practices.

Information We Collect

Information Stored Locally on Your Device

• Bike Profiles: Names you assign to your bike profiles
• Calibration Parameters: Frequency analysis data and associated pressure measurements from your calibration process
• Measurement History: Records of your tire pressure measurements over time

Anonymous Data Collected for App Improvement

To continuously improve measurement accuracy for all users, the app collects:

• Frequency Analysis Data: Mathematical frequency spectrum data derived from tire sounds during calibration
• Calibration Metadata: Tire type information and known pressure values
• Timestamp: When the calibration was performed

Audio Processing

Audio Data: Audio is captured and processed in real-time for pressure analysis. Audio is never saved or stored - it is processed in streaming mode and immediately discarded after analysis.

What We Never Collect

• Raw audio files or recordings
• Personal information (name, email, phone, etc.)
• Device identifiers (IMEI, advertising ID, etc.)
• IP addresses or precise location data
• Usage patterns or behavior tracking
• Measurement history or personal bike profile names

How We Use Your Information

Local Data (Stored on Your Device)

We use locally stored information to:

• Perform real-time tire pressure analysis
• Store your bike profiles and calibration parameters
• Display your measurement history

Anonymous Analytics Data (Transmitted to Our Servers)

We use the collected anonymous frequency analysis data to:

• Improve the accuracy of pressure measurement algorithms
• Develop better calibration models for different tire types
• Enhance the app's performance across various tire brands and conditions
• Research and advance audio-based pressure measurement technology

Data Storage and Security

Local Data (On Your Device)

• 100% Local Storage: All bike profiles, calibration parameters, and measurement history are stored exclusively on your device
• No User Accounts: The app does not require or support user registration or accounts
• Audio Processing: Audio is processed in real-time streaming mode and is never saved to disk or memory
• Local Data Deletion: All local app data is permanently deleted when you uninstall the app

Anonymous Analytics Data (On Our Servers)

• Frequency Data Only: Only mathematical frequency analysis data (not audio) is collected and transmitted
• Secure Transmission: Data is sent over encrypted connections (HTTPS)
• Anonymized: No personally identifiable information or device identifiers are included
• No Audio Files: Raw audio is never transmitted or stored on servers under any circumstances

Your Rights and Choices

Local Data Control

• Access: All your local data is accessible within the app at any time
• Delete Individual Items: Delete specific bike profiles, calibration data, or measurement history entries through the app interface
• Delete Everything: Uninstalling the app permanently deletes all local data
• No Account Required: Use the app without providing any personal information

Anonymous Analytics Data

Since the analytics data we collect is truly anonymous (not linked to you or your device), it cannot be accessed, modified, or deleted on an individual basis. However:

• The data collected contains no personal information
• It cannot be traced back to you
• It is used solely to improve the app for all users

Audio Recording and Processing

Audio Handling

• Real-Time Processing Only: Audio is processed in real-time streaming mode during measurement
• Never Stored Locally: Audio data is never saved to storage, memory buffers, or cache
• Immediate Discard: Audio exists only momentarily during analysis and is immediately discarded
• User Control: Recording only occurs when you actively press and hold the measurement button

What This Means for Privacy

• Audio never leaves your device in any form
• Only anonymous mathematical patterns are collected
• No speech, voices, background sounds, or recognizable audio can be reconstructed
• Your privacy is fully protected

Understanding Frequency Analysis Data

What It Is

• Mathematical representation of sound patterns (spectrum analysis)
• Numerical values representing frequency components (e.g., "120Hz at 0.8 amplitude")
• Similar to a musical note's pitch and volume, but in precise mathematical form

What It Is NOT

• Not an audio recording or audio file
• Cannot be converted back into recognizable sound
• Contains no speech, voices, or background sounds
• Cannot identify you, your location, or your environment

Example Data Point

{"tire_type": "road_700x25c",
  "known_pressure_psi": 85,
  "frequency_peaks": [120Hz, 240Hz, 360Hz],
  "amplitudes": [0.8, 0.5, 0.3],
  "timestamp": "2026-02-08T10:30:00Z"
}

Children's Privacy

The App is not directed to children under 13 years of age. We do not knowingly collect personal information from children under 13.

Changes to This Privacy Policy

We may update this Privacy Policy from time to time. We will notify you of any changes by posting the new Privacy Policy within the App and updating the "Last Updated" date.

Data Retention

Local Data (On Your Device)

• Bike Profiles: Stored until you manually delete them or uninstall the app
• Calibration Parameters: Stored until you manually delete them or uninstall the app
• Measurement History: Stored until you manually delete it or uninstall the app
• Audio Data: Never stored - processed in real-time and immediately discarded
• Complete Deletion: Uninstalling the app permanently deletes all local data

Analytics Data (On Our Servers)

• Frequency Analysis Data: Retained indefinitely for algorithm improvement and research
• Anonymous Nature: Cannot be linked back to you or your device
• Purpose Limitation: Used only for improving measurement accuracy

Compliance

This Privacy Policy is designed to comply with:

• General Data Protection Regulation (GDPR)
• California Consumer Privacy Act (CCPA)
• Apple App Store Guidelines
• Google Play Store Guidelines

By using the App, you agree to the collection and use of information in accordance with this Privacy Policy.