Privacy policy

Last updated: 14 November 2026

This policy explains how the Piano Duel app for iPhone and iPad handles information. The developer is Antonio Oliver. Questions: antonio.oliver@gmail.com.

Summary

Piano Duel has no developer backend and does not run its own servers for the app. There are no ads, no analytics or crash-reporting SDKs, and no tracking across other companies’ apps or websites. Settings, progress and similar data stay on your device unless you use Apple services described below.

Data stored only on your device

The app stores game settings, hero and name choices, song progress, sound preferences, a local “unlock all songs” flag after a verified purchase, and the name of the last connected MIDI piano. This stays in the app’s storage on your device (for example UserDefaults). It is removed if you delete the app. It is not sent to Antonio Oliver.

Notes from a MIDI keyboard or the on-screen keys are processed on the device to run the game and are not uploaded.

Bluetooth and MIDI

If you connect a Bluetooth MIDI piano, iOS asks for Bluetooth permission. The app uses Bluetooth only to talk to that musical instrument. It does not use your location, and it does not include location or microphone permission. Audio is used for playback (piano sounds and accompaniment), not for recording.

Game Center

Online duel is optional and uses Apple Game Center turn-based matches. There is no separate Piano Duel game server. If you sign in and play online, Apple operates Game Center under Apple’s privacy policy.

For a match, the app uses your Game Center player ID and can show Game Center display names. It also writes match data that Game Center stores and shares with the other player: the in-game name you set, the song, your chosen hero, difficulty, score, hits, misses and best streak. This is used only to run the duel and show the result. Piano Duel does not use Game Center data for advertising or tracking.

Purchases (StoreKit)

Unlocking all songs is a one-time in-app purchase handled by Apple through StoreKit and the App Store. Apple processes the payment under Apple’s privacy policy. The app does not see your card or Apple ID password. After Apple verifies a purchase or restore, the app stores an entitlement flag on the device so the songs stay unlocked. Buy and restore are behind a simple parental gate in the app.

Children and families

Piano Duel is made for families, including children playing with a parent. The developer does not collect children’s personal data on any Piano Duel server. If a child uses Game Center or an in-app purchase, that is handled by Apple under Apple’s rules and the Apple ID / Game Center account in use (including any parental controls you have set on the device).

This website

This website is a static information site. It does not use analytics, advertising or account sign-in. If you email for support, the address and message you send are used only to reply.

Changes

If this policy changes, the updated text will be published on this page with a new date.