Privacy Policy for TuneUp

Last updated: 31 August 2026

1. Information We Collect

TuneUp collects only what its features require, and all of it stays on your device:

• Microphone audio — Used exclusively for real-time pitch detection (tuning). Audio is analysed frame by frame and discarded; it is never recorded, stored, or transmitted to any server.
• App preferences — Theme, concert pitch (A4), detection sensitivity, buffer size, selected instrument and string, and metronome settings, stored locally on the device.
• Your songbook — The song titles and web links you add, stored locally on the device.
• Imported sheet music — Images you choose from your photo library or files are copied into TuneUp's own private storage on the device so they remain available offline. They are never uploaded.

2. How We Use Your Data

• Microphone access: real-time frequency analysis using the YIN algorithm to detect musical notes.
• Preferences: to remember your settings between sessions.
• Songbook and sheet music: to show your songs and display the pages you imported.

3. Opening Song Links

A song in your songbook can be a link to a website. Opening one launches that page in an in-app browser tab.

The website you open is operated by a third party and is governed by its own privacy policy, not this one. As with any web browsing, that site receives your IP address, browser user-agent and similar request data.

The tab runs inside your device's default browser, so it uses that browser's existing cookies and sign-in sessions — a site you are already logged into will recognise you, exactly as it would in a normal browser tab. Any cookies it sets belong to that browser, not to TuneUp. TuneUp does not receive, read, or store anything about the page you view.

4. Data Sharing

TuneUp collects no personal data. There are no accounts, no sign-in, no advertising and no analytics. The app makes no network requests of its own — the only time it reaches the internet is when you deliberately tap a song link, as described in section 3.

We do not share, sell, or transmit your personal data to third parties. All audio processing, preference storage and sheet-music storage happen on-device. The one time data leaves your device is when you deliberately open a song link, as described in section 3.

TuneUp includes an optional crash-reporting facility for diagnosing failures. It is inactive unless a reporting endpoint is configured when the app is built, and no such endpoint is configured in the current release — so no diagnostic data leaves your device.

5. Permissions

Every permission TuneUp declares is listed below, with what it is for. The microphone is the only one the app ever asks you to grant; the rest are either automatic or declared without ever being requested.

• Microphone (RECORD_AUDIO) — Required for pitch detection. You can revoke this in system settings at any time; the tuner will not function without it.
• Photos and files — Used only when you tap "photos" or "files" to add sheet music. Selection happens in the system picker, so TuneUp only ever receives the specific items you choose. It has no access to the rest of your library, and it does not request camera access.
• Storage (READ_EXTERNAL_STORAGE, WRITE_EXTERNAL_STORAGE) — Declared only for compatibility with Android 12 and earlier, where the photo-picker component historically needed it. Both are capped at Android 12 (maxSdkVersion="32") and TuneUp never requests either at runtime, so on any device they are never granted.
• Internet (INTERNET) — Used to open the song links you tap. No other network activity takes place.
• Network state (ACCESS_NETWORK_STATE) — Declared by the app framework; it reports only whether a network connection exists. It carries no information about you and reveals nothing to us.
• Vibration (VIBRATE) — Haptic feedback in the tuner and metronome.
• Audio settings (MODIFY_AUDIO_SETTINGS) — Lets the tuner and metronome select the audio routing and mode they need. It does not change your device's volume or any other system setting.

TuneUp runs no background services. The metronome sounds only while the app is open and in front of you, and stops as soon as you leave it; the tuner listens only while the tuner screen is open.

TuneUp also defines one permission for its own internal use (com.delphion.tuneup.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION). It is created by the Android support libraries so that the app's internal components can talk to each other and not to other apps. It grants no access to your device or your data, and no other app can hold it.

6. Data Retention

No audio data is retained. Preferences, your songbook and imported sheet music persist until you remove them in the app, clear the app's data, or uninstall it. Removing a song from your songbook deletes its imported sheet images from the device.

7. Children's Privacy

TuneUp is not directed at children under 13. We do not knowingly collect data from children.

8. Changes to This Policy

Updates will be posted here with a revised "Last updated" date.

9. Contact

Questions? Contact: superamazingdeveloper@gmail.com

This policy covers the TuneUp mobile application (package: com.delphion.tuneup) distributed via Google Play Store.