Centerline Privacy Policy

Microphone

Centerline requests microphone access only to determine the pitch of an instrument. Audio is analyzed in real time on the device. It is not recorded, saved, transmitted, or shared.

Microphone capture runs only while Centerline is on screen and in the foreground. The moment Centerline is no longer the app in front of you it stops: switching to another app, opening the recent-apps list, a dialog or a call taking over the screen, and the screen turning off are all cases of that one rule.

Split screen is the case worth stating rather than leaving to inference. On Android 10 and later the system keeps every visible app resumed, so Centerline running beside another app keeps listening while you work in that other window. That is deliberate: a tuner propped next to a tab or a lesson is a real way to use it, and it is still on screen in front of you. On Android 9 and earlier the system pauses whichever window you are not using, so there Centerline stops the moment the other app takes focus.

Centerline never captures audio in the background, and it runs no background service that would let it. While a reading is in progress Centerline asks the system to keep the screen awake so you can watch the meter with both hands on the instrument; that request is dropped the moment capture stops.

Data collection and sharing

Centerline does not collect, transmit, sell, or share personal information or usage data. It contains no advertising, analytics, tracking, account system, or cloud service. The Android app does not request network access at all, and neither app contains any networking code.

Purchases

Centerline's optional unlock is a one-time purchase. The payment is processed entirely by Google Play, and by the App Store if the iOS app offers the same unlock; Centerline never receives your payment details and has no account of its own to attach them to. The only thing the app itself stores is whether the unlock is owned, on your device, alongside your other tuning preferences. How the store handles your payment information is described in its own privacy policy.

Data retention and deletion

Because Centerline does not collect or store personal data, there is no personal data to retain or delete. Your tuning preferences, if you set any, are stored only on your own device and are removed when you uninstall the app.

Children

Centerline does not knowingly collect information from children or anyone else.

Changes

If this policy changes, the effective date above will be updated. A future version that changes the app's data practices will disclose those changes before release.

Contact

Questions about this policy or the app: wyatt@endpaperlabs.com

Endpaper Labs LLC