This policy applies to the Metro Gnome Android app ("the app", "we", "us") published on Google Play. It was last updated on 14 June 2026.
The Short Version
Information We Do Not Collect
Metro Gnome has no login and no user accounts. We do not collect your name, email address, phone number, contacts, location, or any other information that personally identifies you. You can use every feature of the app without providing any personal detail.
Microphone
The app requests microphone access for its listening features: the rhythm game, the chromatic tuner, and Groove Check timing feedback in Practice and Speed Trainer. Permission is requested at the time you first use one of these features, and the rest of the app works fully without it.
All microphone audio is analysed in real time on your device to detect pitch and the timing of your claps or notes. The audio is never saved to a file, never recorded, and never transmitted off your device. When you stop using a listening feature, nothing about the sound remains.
Data Stored On Your Device
Your settings, presets, high scores, practice streak, unlocked items, and reward progress are saved locally on your device only. This information stays on your phone, is not sent to us, and is removed when you uninstall the app.
Anonymous Usage Analytics
The app uses Google Firebase Analytics to understand how features are used so we can improve them. These are aggregate, anonymous usage events, for example that a metronome session started, how long a session lasted, which sound was selected, or that a game was completed with a given score. This data is not linked to your identity and is not used to track you across other apps or websites.
Anonymous Crash Reporting
The app uses Google Firebase Crashlytics to report crashes and errors automatically. A crash report contains technical diagnostic information such as the device model, the Android version, the app version, and the state of the app at the moment it failed. This helps us find and fix bugs. It does not include your personal identity.
Anonymous Diagnostic Submissions
To improve how reliably the microphone features work across the wide range of Android hardware, the app may send anonymous diagnostic measurements to a Google Firebase (Firestore) database. There are two such streams:
- Microphone check results. When you run the in-app microphone check, the app may submit the outcome along with measurements it already computed, such as the device model, Android version, app version, measured audio latency, ambient noise level, and how well the test distinguished claps from clicks.
- Tuner feedback. If you rate a tuner reading, the app may submit that rating together with the technical readings from that moment, such as the detected note and frequency, tuning accuracy, calibration settings, and the device and app version.
These submissions are tied only to an anonymous Firebase identifier created on the device, never to a personal account, and they contain no personal information. They are write-only from the device and are used solely to improve the accuracy of the tuner and the microphone timing features. This reporting is best effort and never affects how the app works for you.
Advertising
Metro Gnome is free and displays ads through Google AdMob. To serve ads, Google's advertising SDK may collect device identifiers, IP address, and app usage information in accordance with Google's own privacy practices. You can review and control ad personalization in your device settings, and you can learn more from Google's policy on how it uses information from sites or apps that use its services.
Third-Party Services
The app relies on the following third-party services, each governed by its own privacy policy:
- Google AdMob, for displaying ads.
- Google Firebase, for anonymous usage analytics, crash reporting, anonymous diagnostic submissions, and the anonymous authentication those submissions use.
You can read Google's privacy policy at policies.google.com/privacy.
Permissions
- Microphone (RECORD_AUDIO). Used only for the listening features described above, requested when you first use them. Audio is processed on your device and never uploaded.
- Internet (INTERNET). Used to display ads and to send the anonymous analytics, crash reports, and diagnostic submissions described above.
Children's Privacy
Metro Gnome is not directed at children under 13, and we do not knowingly collect personal information from children. Because the app does not collect personal information from anyone, this is straightforward, but if you believe a child has provided personal information through the app, please contact us and we will address it.
Your Choices
You can decline or revoke microphone permission at any time in your device settings, and the listening features will simply be unavailable while the rest of the app keeps working. You can limit ad personalization through your device's advertising settings. Uninstalling the app removes all data stored locally on your device.
Changes to This Policy
We may update this policy from time to time. When we do, we will revise the effective date at the top of this page and post the updated version here.
Contact
If you have any questions about this privacy policy, you can reach us at accesscommsa@gmail.com.