Privacy Policy

Metrony • Last updated: October 28, 2026 • Effective Date: October 28, 2026

Published by Lumitrix Software

1. Introduction

Lumitrix Software (“we”, “us”, or “our”) is committed to protecting your privacy and providing full transparency. This Privacy Policy explains how information is handled in connection with the Metrony mobile application (the “App”).

Metrony is a digital metronome for musicians. It offers precise control over tempo (20–300 BPM), beats per measure (1–16), custom accents per beat, a Tap Tempo feature, and a preset library that you can organise in folders, mark as favourites, search, and reorder. It can keep playing with the screen off or while the App is in the background.

The App is published under our existing Google Play Console publisher account as a natural person. We do not collect any personal data on our own servers or for our own purposes. All user preferences are stored locally on your device and never transmitted to us.

However, the App includes third-party services (Google Mobile Ads – AdMob and Google Fonts). This Policy complies with the EU General Data Protection Regulation (GDPR / RGPD), the French Data Protection Act, CNIL recommendations on mobile applications, Google Play Developer Program Policies, and the Google EU User Consent Policy (2026).

2. Who We Are (Data Controller)

The data controller responsible for the App is:

Lumitrix Software
Contact: lumitrixsoftware@proton.me

3. Information We Collect

3.1 Data Collected by the App

The App itself collects no personal data on our servers. It does not:

  • Collect, access, store, or transmit device identifiers (including Advertising ID), location, contacts, camera, microphone, or usage analytics for our own purposes.
  • Record, store, or transmit any audio. The App only plays sound; it never listens.
  • Use Firebase, Google Analytics, crash reporting, user accounts, email, or any pseudonym identification.

The only data handled locally consists of user preferences (tempo, beats per measure, accent patterns, presets and folders, favourites, haptic settings, and preferred language), securely stored in a local Hive database on your device. These preferences never leave your device and are deleted upon uninstallation or data clearance.

3.2 Permissions and Why They Are Needed

The App declares a deliberately small set of Android permissions. None of them gives us access to your personal content, and none of them is used to collect data:

  • Internet — to load Google Fonts and to request banner advertisements (only after consent).
  • Foreground service (media playback) — so the metronome can keep time while the App is in the background or the screen is off. See section 3.3.
  • Wake lock — to prevent the CPU from being suspended mid-practice, which would make the beat stutter or stop.
  • Notifications (Android 13 and later, optional) — to display the playback notification described in section 3.3. If you decline, the metronome still works normally; you simply will not see the notification or its Stop button.

The App does not request access to your microphone, camera, location, contacts, calendar, photos, files, or phone state. Third-party SDKs included in the App may declare additional technical permissions of their own (for example, AdMob may access network state and, subject to your consent, the Advertising ID); these are described in section 3.4.

3.3 Background Playback and Notifications

When you start the metronome, the App may run a foreground service of the type media playback so that the beat stays accurate and uninterrupted while the screen is off or another app is in the foreground. While this service is active, Android requires the App to display an ongoing notification.

This notification is generated locally on your device. It shows the current tempo and beat count and includes a Stop action. It contains no personal data, is not transmitted anywhere, and disappears when you stop the metronome or close the App. The foreground service and the wake lock are released as soon as playback stops.

3.4 Data Processed by Third-Party Services

Banner advertisements are displayed exclusively after explicit user consent is obtained through the Google User Messaging Platform (UMP). In such cases, Google (as an independent data controller) may process personal data such as device identifiers (including the Advertising ID), IP address, and app interaction data for ad serving, measurement, and fraud prevention in accordance with your consent settings. We have no access to, control over, or visibility into this data.

If you do not consent, the App does not request personalised advertising.

Google Fonts are loaded from Google servers, which may transmit your IP address to Google in the United States.

The App also uses the Google Play In-App Review API to occasionally invite you to rate it. That dialog is provided and processed by Google Play; we never see your identity, your rating, or your review through it, and no data about you is sent to us.

Other SDKs integrated in the App (Hive CE, intl, package_info_plus, url_launcher, animations, uuid, permission_handler) perform purely functional or local operations and do not collect or transmit personal data.

4. How We Use Information and Legal Basis

Since we collect no personal data on our own servers, no processing occurs on our part.

Local storage of preferences is based on our legitimate interest (Article 6(1)(f) GDPR) to deliver core App functionality.

Background playback, the wake lock, and the playback notification rely on the same legitimate interest: keeping the metronome accurate and usable while you practise. They involve no personal data.

Advertisement serving relies solely on your explicit consent (Article 6(1)(a) GDPR) obtained via the UMP consent form. You may withdraw consent at any time through the in-app Privacy Options entry point. No personalised advertising occurs without consent.

5. Sharing of Information

We do not share, sell, or disclose any data with third parties. The sole exception is the automatic, consent-based interaction with the Google Mobile Ads (AdMob) SDK, where Google acts as an independent controller. Google’s processing is governed exclusively by its Privacy Policy: https://policies.google.com/privacy.

6. International Data Transfers

Any data processed by Google via AdMob or Google Fonts may be transferred outside the EEA (including to the United States). Google participates in the EU-U.S. Data Privacy Framework and relies on Standard Contractual Clauses where required. Full details are available in Google’s Privacy Policy.

7. Data Retention

Local preferences are retained on your device only for as long as the App is installed and not cleared. We retain no data.

8. Security

We implement appropriate technical and organisational measures, including sandboxed local storage, minimal permissions, and absence of external servers, to protect any locally stored preferences. The playback notification is generated on-device and contains no personal data. Google is responsible for the security of any data it processes via AdMob or Google Fonts.

9. Your Rights under GDPR / RGPD

In accordance with Articles 15–22 GDPR, you have the following rights (exercisable free of charge, subject to identity verification):

  • Right of access, rectification, or erasure (though we hold no data).
  • Right to restriction of processing or objection.
  • Right to data portability.
  • Right to withdraw consent for advertising at any time via in-app settings.
  • Right to lodge a complaint with the CNIL (www.cnil.fr) or your local supervisory authority.

You can also revoke the notification permission at any time in your device settings; the metronome will continue to work without it.

To exercise any rights, contact us at lumitrixsoftware@proton.me. We respond within one month.

10. Children's Privacy

The App is intended for all ages and is not targeted at children under 13 (or under 16 in certain jurisdictions). No data collection practices trigger COPPA or equivalent child-specific rules.

11. Third-Party Services

  • Google Mobile Ads (AdMob): Google Privacy Policy
  • Google User Messaging Platform (UMP): consent management, provided by Google.
  • Google Play In-App Review: the rating dialog is provided and processed by Google Play.
  • Google Fonts: Fonts loaded from Google servers, which may transmit your IP address to Google (disclosed above).
  • Other libraries (Hive CE, intl, package_info_plus, url_launcher, animations, uuid, permission_handler): purely local or functional, with no data collection.

12. Changes to This Privacy Policy

We may update this Policy to reflect App changes or legal requirements. The most current version is always available at this URL. Continued use of the App after updates constitutes acceptance of the revised Policy.

13. Contact Us

For questions, rights requests, or concerns:
lumitrixsoftware@proton.me

© 2026 Lumitrix Software