Effective date: July 20, 2027
App name: stemixer
Developer: Captain Neoguri
Contact: captain.neoguri@gmail.com

1. Introduction

This Privacy Policy explains how stemixer (“the App,” “we,” “us”) handles information when you use our Android application. The App provides on-device audio stem separation, multitrack mixing, live microphone monitoring, and related music practice and performance features.

By using the App, you agree to this Privacy Policy. If you do not agree, please do not use the App.

2. Information We Process

2.1 Information you provide

• Audio files and URLs you import (local files or links from supported sources such as YouTube and other media URLs)

• Mixer settings (stem volumes, BPM, key, presets, export preferences)

• Terms of Service acceptance and onboarding completion status

2.2 Information collected automatically on your device

• App preferences stored locally (settings, library metadata, playback session)

• Temporary cache files created during separation, mixing, and export

• Device and app information needed for core functionality (e.g., audio routing, storage paths)

2.3 Microphone data

If you enable the microphone feature, the App accesses microphone input only while the feature is active to mix your voice with playback. Microphone audio is processed for real-time monitoring and mixing. We do not intentionally upload your microphone recordings to our servers.

2.4 Advertising data (planned — Google AdMob)

We plan to show ads through Google AdMob. When ads are enabled, Google may collect and process information such as:

• Advertising ID (AAID)

• IP address

• Device type, OS version, language

• Ad interaction data (impressions, clicks)

• Approximate location (derived from IP)

This data is collected and processed by Google under its policies:

• https://policies.google.com/privacy

• https://support.google.com/admob/answer/6128543

You can limit ad personalization in your device settings (Google → Ads).

3. How We Use Information

We use information to:

• Separate audio into stems and play/mix tracks

• Save your library and restore mixer sessions

• Run background separation and playback (with notifications, if permitted)

• Improve stability and performance on your device

• Display advertisements (when AdMob is integrated)

• Comply with legal obligations

4. On-Device Processing

Stem separation, BPM/key analysis, and most audio processing run on your device. Your imported audio and separated stems are stored in the App’s private storage unless you export them.

5. Network Use

The App may use the internet to:

• Import audio from URLs you submit

• Load album art/thumbnails

• Download or update components required for URL extraction (where applicable)

• Serve and measure advertisements (AdMob)

We do not sell your personal audio content.

6. Data Sharing

We do not sell your personal information.

We may share limited data with:

• Google (AdMob) — for advertising and measurement (when enabled)

• Service providers / SDKs that help the App function (e.g., network libraries, image loading), only as needed for those features

• Authorities when required by law

Audio you import is not shared with advertisers.

7. Data Retention

• Library and separated files: kept on your device until you delete them in the App or uninstall the App

• Cache: may be cleared from Settings or automatically during cleanup

• Ad-related data: retained per Google’s policies

8. Your Choices and Rights

Because the App does not require an account, you can:

• Delete songs/library items inside the App

• Clear cache in Settings

• Uninstall the App to remove locally stored data

• Manage ad personalization in Android system settings

To exercise rights or ask questions, contact: captain.neoguri@gmail.com

9. Children’s Privacy

The App is not directed to children under 13 (or the minimum age in your country). We do not knowingly collect personal information from children. If you believe a child has provided data, contact us and we will take appropriate steps.

10. Security

We use reasonable measures to protect data on your device. No method of storage or transmission is 100% secure.

11. International Users

If you use the App outside your home country, your information may be processed on your device and by third parties (such as Google) according to their policies.

12. Changes to This Policy

We may update this Privacy Policy. We will post the updated version with a new effective date. Continued use after changes means you accept the updated policy.

13. Contact Us

Captain Neoguri
Email: captain.neoguri@gmail.com