FlowAudio — Legal Documents

App: FlowAudio (AutoSpeedAudio)	Version: 1.0.0	Package: `com.cstnl.autospeedaudio`
Platform: Android (API 31+)	Effective Date: June 10, 2026

Privacy Policy

This Privacy Policy describes how FlowAudio (“the App,” “we,” “us,” or “our”) handles information when you use the FlowAudio Android application (com.cstnl.autospeedaudio). We are committed to being fully transparent about what data is processed and why.

1. Information We Collect

1.1 GPS Speed Data (on-device only)

The App uses your device’s GPS chip to measure your current speed via FusedLocationProviderClient with PRIORITY_HIGH_ACCURACY. Specifically:

GPS fixes are requested approximately every 1 second (minimum interval 500 ms) while the service is active
The raw location.speed value (m/s) is converted to km/h on-device and passed through an Exponential Moving Average filter
Raw coordinates are never read, stored, or transmitted — the App calls location.speed, not location.latitude or location.longitude
Smoothed speed readings are used only to select a volume tier and update the on-screen display; they are discarded immediately and never written to disk

1.2 Firebase Analytics

The App integrates Firebase Analytics (com.google.firebase:firebase-analytics v23.2.0) to collect anonymised usage events. The following events are logged:

Event	When fired
`service_started`	User activates the GPS volume service
`service_stopped`	User or watch stops the service
`terms_accepted`	User accepts the Terms & Privacy screen on first launch
`permission_denied`	User denies a required permission (location or notification)

Firebase Analytics does not collect on our behalf:

Your GPS coordinates, speed readings, or travel history
Your configured volume levels or speed thresholds
Your name, email address, or any personally identifiable information
Your device’s IMEI or advertising ID (Firebase uses a pseudonymous app instance ID only)

Analytics data is transmitted to Google’s servers and is subject to Google’s Privacy Policy and the Firebase Data Processing Terms.

1.3 Firebase Crashlytics

The App integrates Firebase Crashlytics (com.google.firebase:firebase-crashlytics) to automatically detect and report app crashes and non-fatal errors. When the App crashes or encounters a handled exception, Crashlytics collects:

A stack trace identifying which part of the App code failed
Device information: device model, manufacturer, OS version, available memory and storage, and screen resolution
App information: app version, version code, and time since last restart
A Crashlytics-assigned installation identifier (a pseudonymous identifier scoped to this app install, distinct from the Firebase Analytics instance ID)

Crashlytics does not collect:

Your GPS coordinates, speed readings, or location history
Your configured volume levels or speed thresholds
Your name, email address, or any personally identifiable information

Crash reports are uploaded to Google’s servers the next time the App has an internet connection, which may be after the crash occurred. This data is subject to Google’s Privacy Policy and the Firebase Data Processing Terms.

1.4 User-Configured Settings

The App stores your preferences locally in Android SharedPreferences (file: flowaudio_settings). Stored keys are:

Key	Type	Content
`speed_t1` – `speed_t4`	Int	km/h thresholds for tiers 1–4
`vol_pct_0` – `vol_pct_4`	Int	Volume percentage per tier (0–100)
`tier_en_1` – `tier_en_4`	Boolean	Whether each tier is enabled
`sensitivity`	Float	Speed sensitivity (0–1)
`terms_accepted`	Boolean	Whether the first-launch legal screen has been accepted

These values never leave your device.

1.5 System Audio State

The App reads STREAM_MUSIC volume from AudioManager to display the live volume bar and to calculate fade targets. This value is not collected or transmitted.

1.6 Wear OS Data Layer

If you use the companion Wear OS app, your five volume percentages, four speed thresholds, per-tier enable flags, sensitivity value, and service active state are written to a Wearable Data Layer item at /flowaudio/settings. This data travels over the local Bluetooth/Wi-Fi Wearable Data Layer between your phone and your paired watch only — it is not transmitted to any external server.

1.7 What We Do Not Collect

The App does not collect:

GPS coordinates, routes, or location history
Speed history or trip logs
Audio content or media metadata
Names, email addresses, or account credentials
IMEI, Android advertising ID, or persistent device identifiers

2. How We Use Information

Data	Purpose	Leaves device?
GPS speed (on-device)	Select volume tier; update UI display	No
Firebase Analytics events	Understand feature usage; improve the App	Yes — to Google (anonymised)
Crashlytics crash/error reports	Diagnose and fix app stability issues	Yes — to Google (pseudonymous)
`SharedPreferences` settings	Persist user configuration between sessions	No
`STREAM_MUSIC` level	Display live volume bar; calculate fade targets	No
Wearable Data Layer item	Sync settings and service state to paired Wear OS watch	No (local only)

We do not sell, rent, or share data with third parties for advertising or marketing purposes.

3. Permissions

Permission	Required on	Purpose
`ACCESS_FINE_LOCATION`	All versions	`PRIORITY_HIGH_ACCURACY` GPS fixes via `FusedLocationProviderClient`
`ACCESS_COARSE_LOCATION`	All versions	Required alongside fine location by the Android platform
`FOREGROUND_SERVICE`	All versions	Required to call `startForeground()`
`FOREGROUND_SERVICE_LOCATION`	Android 14+ (API 34)	Allows the foreground service to receive GPS callbacks when the screen is off
`POST_NOTIFICATIONS`	Android 13+ (API 33)	Required to display the persistent foreground service notification
`INTERNET`	All versions	Used by Firebase Analytics and Crashlytics to transmit anonymised usage events and crash reports; the App’s GPS and volume features function without internet access

ACCESS_FINE_LOCATION, ACCESS_COARSE_LOCATION, and POST_NOTIFICATIONS require a runtime grant dialog. The service will not start if any location permission is denied.

4. Data Storage and Retention

GPS speed readings are processed in memory and never written to disk
SharedPreferences data persists until you uninstall the App or clear its storage via Android Settings → Apps → FlowAudio → Storage → Clear Data
Firebase Analytics data is retained by Google for 14 months by default, in accordance with Google’s data retention policy
Crashlytics crash and error reports are retained by Google for 90 days by default
The Wearable Data Layer item is overwritten on every settings change and deleted when the App is uninstalled

5. Third-Party Services

Google Play Services — FusedLocationProviderClient

com.google.android.gms:play-services-location v21.3.0 provides the GPS speed API. No location data is transmitted to Google through this integration; the App reads only the speed value from the local API response.

Firebase Analytics

com.google.firebase:firebase-analytics v23.2.0 collects the four anonymised events listed in section 1.2. Please refer to:

Firebase Crashlytics

com.google.firebase:firebase-crashlytics collects crash and error reports as described in section 1.3, including stack traces and device diagnostic information. Crashlytics is a separate Firebase product from Analytics and uses its own installation identifier. Please refer to:

Google Wearable Data Layer

com.google.android.gms:play-services-wearable v20.0.1 is used to sync settings between the phone app and the Wear OS companion app via DataClient and MessageClient. Data travels only between your paired devices over the local Wearable Data Layer.

6. Your Choices

Opt out of interest-based advertising: Go to Settings → Google → Ads → Delete advertising ID (Android 12+) or Opt out of Ads Personalisation (earlier versions). This limits Firebase Analytics’ ability to associate events with an advertising profile.
Reset the Firebase instance ID: Uninstalling and reinstalling the App generates a new Firebase app instance ID, effectively unlinking any prior analytics history.
Crashlytics data: Crash and error reports are tied to a separate Crashlytics installation identifier; uninstalling and reinstalling the App also resets this identifier.
Delete all App data: Android Settings → Apps → FlowAudio → Storage → Clear Data removes all locally stored settings, including the terms_accepted flag.

7. Children’s Privacy

The App is not directed at children under the age of 13. We do not knowingly collect personal information from children. Firebase Analytics is configured without advertising features. If you have concerns about a child’s use of the App, please contact us.

8. Changes to This Privacy Policy

We may update this Privacy Policy at any time. Changes will be reflected in a new App version with a revised effective date at the top of this document. Continued use of the App after an update constitutes acceptance of the revised policy.

9. Contact

For questions or concerns about this Privacy Policy, please contact us through the App’s listing on the Google Play Store.

Summary: GPS coordinates never leave your device. The App sends four anonymised usage events to Firebase Analytics and automatic crash/error reports to Firebase Crashlytics — neither includes location data, speed data, or personal identifiers.

Terms of Service

Please read these Terms of Service (“Terms”) carefully before using FlowAudio. By installing or using the App, you agree to be bound by these Terms. If you do not agree, do not use the App.

1. Description of the App

FlowAudio (package com.cstnl.autospeedaudio, displayed as FlowAudio) is an Android application that automatically adjusts your device’s media volume based on real-time GPS speed. It runs as a foreground service (SpeedVolumeService) and reads GPS speed via FusedLocationProviderClient with PRIORITY_HIGH_ACCURACY to apply one of five configurable volume tiers to STREAM_MUSIC. An optional Wear OS companion app allows tier and sensitivity adjustments from a paired watch. The App uses Firebase Analytics to collect anonymised usage events and Firebase Crashlytics to collect automatic crash and error reports, both to help improve the product.

2. Eligibility and Device Requirements

To use the App you must:

Be at least 13 years of age, or the minimum age of digital consent in your jurisdiction
Own or have authorised use of an Android device running Android 11 (API 31) or higher, targeting API 36
Have a device with GPS hardware (the App will not install on devices without GPS, enforced by <uses-feature android:name="android.hardware.location.gps" android:required="true" />)
Grant the required location permissions; notification permission is additionally required on Android 13+

3. Licence

Subject to these Terms, we grant you a limited, non-exclusive, non-transferable, revocable licence to install and use the App on your personal Android device for personal, non-commercial purposes. You may not:

Copy, modify, distribute, sell, or sublicence the App or any part of it
Reverse engineer, decompile, or disassemble the App
Use the App for any unlawful purpose
Remove or alter any proprietary notices in the App

4. Acceptable Use

By using the App you agree that:

You will comply with all applicable laws and regulations, including road traffic and noise laws in your jurisdiction
You will not interact with the App’s UI while operating a moving vehicle — configure all settings before driving; stop requires a deliberate long-press on the speed ring specifically to prevent accidental deactivation
You are solely responsible for ensuring your configured volume tiers allow you to hear safety-critical sounds (emergency sirens, horns, vehicle warnings) at all speeds and in all conditions
You will not use the App in any way that could endanger yourself or others

5. Analytics and Data Collection

By using the App you acknowledge and agree that:

The App collects four anonymised usage events via Firebase Analytics (service_started, service_stopped, terms_accepted, permission_denied) as described in the Privacy Policy
The App automatically collects crash and error reports via Firebase Crashlytics, including stack traces and device diagnostic information (device model, OS version, memory/storage state, app version), as described in the Privacy Policy
No GPS coordinates, speed readings, or personal data are included in analytics events or crash reports
Firebase Analytics and Crashlytics require an internet connection to transmit events and reports; the App’s core GPS and volume features function fully without internet access
You may limit analytics and crash data collection using the opt-out options described in the Privacy Policy

6. GPS and Location Permissions

By granting location permissions you acknowledge that:

The App accesses GPS solely to calculate instantaneous speed using location.speed; it does not read, store, or transmit your coordinates
GPS accuracy may vary by environment — tunnels, underground car parks, and dense urban canyons can cause signal loss
Cold GPS start (first launch or after a long gap) may take 30–60 seconds; no volume changes are applied during this time
You may revoke location permissions at any time via Android Settings; doing so will prevent the service from starting

7. Foreground Service, Notification, and Battery Use

The App runs SpeedVolumeService with foregroundServiceType="location" to maintain GPS callbacks when the screen is off. You acknowledge that:

A persistent notification displaying live speed and volume is shown at all times while the service is active, as mandated by Android
Continuous PRIORITY_HIGH_ACCURACY GPS consumes approximately 5–10% battery per hour on a typical device
You can stop the service at any time via a long-press on the speed ring in the App, via the notification, or via the STOP button on a paired Wear OS watch

8. Volume Control and Audio Safety

The App controls your device’s STREAM_MUSIC volume automatically. You expressly acknowledge and agree that:

You are solely responsible for configuring volume tiers to levels that are safe for your environment and allow you to hear safety-critical audio at all speeds
Tier 0 (default 12%) is the permanent floor and cannot be disabled; volume will not drop below it while the service is active
When the service is stopped, volume remains at the last level set by the App and is not restored to the level that existed before activation
When GPS signal is lost (e.g. in a tunnel), volume remains at the last applied level until the next valid GPS fix; the App does not attempt to lower volume during signal loss
The speed displayed is a smoothed GPS-derived value (Exponential Moving Average, α = 0.35, ≈ 3 s window); actual speed may differ slightly from the displayed value near thresholds
Volume tier changes are applied via a 1.2-second linear fade to avoid abrupt changes

9. Wear OS Companion App

The Wear OS companion app (:wear module) is a remote control for the phone service. You acknowledge that:

The companion app can adjust volume tiers, speed thresholds, per-tier enable flags, and sensitivity from your wrist, and can stop the running service
The companion app cannot start the GPS service; activation is phone-only
The companion app requires the phone app to be installed and signed with the same key (com.cstnl.autospeedaudio)

10. Disclaimer of Warranties

THE APP IS PROVIDED “AS IS” AND “AS AVAILABLE” WITHOUT WARRANTIES OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT. WE DO NOT WARRANT THAT:

The App will operate without interruption or error on all devices
GPS speed readings will be accurate in all environments
Volume tier transitions will occur at precisely the configured thresholds in all conditions
Firebase Analytics events and Crashlytics reports will be delivered under all network conditions

11. Limitation of Liability

TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, WE SHALL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES ARISING FROM YOUR USE OF THE APP, INCLUDING BUT NOT LIMITED TO:

Hearing damage caused by elevated media volume
Failure to hear safety-critical audio (sirens, horns, warnings) due to volume levels set by the App
Vehicle accidents or personal injury
Loss of data or device malfunction

IN NO EVENT SHALL OUR TOTAL LIABILITY EXCEED THE AMOUNT YOU PAID FOR THE APP (IF ANY).

12. Indemnification

You agree to indemnify and hold harmless FlowAudio and its developers from any claims, liabilities, losses, and expenses (including legal fees) arising from your use of the App, your violation of these Terms, or your violation of any applicable law.

13. Updates and Modifications

We may update the App and these Terms at any time. Updates are delivered via the Google Play Store. Continued use of the App after an update to these Terms constitutes acceptance of the revised Terms.

14. Termination

We may suspend or terminate access to the App for conduct that violates these Terms. You may stop using the App at any time by uninstalling it.

15. Governing Law

These Terms are governed by applicable law. Disputes shall be subject to the exclusive jurisdiction of the courts in the developer’s country of residence, unless mandatory consumer protection law in your jurisdiction provides otherwise.

16. Severability

If any provision of these Terms is found unenforceable, it shall be limited to the minimum extent necessary and the remaining provisions shall continue in full force.

17. Entire Agreement

These Terms, together with the Privacy Policy above, constitute the entire agreement between you and FlowAudio regarding the App.

18. Contact

For questions about these Terms, please contact us through the App’s listing on the Google Play Store.

By installing and using FlowAudio, you confirm that you have read, understood, and agreed to these Terms of Service.

FlowAudio v2.9.1 (versionCode 7) · com.cstnl.autospeedaudio · Android Kotlin · Jetpack Compose + Wear OS · GPS Edition