Account Information (optional)

If you choose to create an account, we collect:

• Email address — used for account creation, sign-in, and account recovery

• Name — if provided through Sign in with Apple (Apple may hide your real email and provide a relay address — we respect this choice)

Creating an account is optional. You can use the app without signing in, and all features work fully without an account.

Practice Activity Data (if signed in)

If you sign in, the following data is synced to our secure cloud servers to enable cross-device access:

• Practice session timestamps and durations

• Which features you used (e.g., Tuner, Scale Library, Metronome)

• Feature-specific context (e.g., which key or scale you were practicing)

• Streak and progress statistics

This data is used solely to provide you with your practice history and progress tracking across your devices. It is never shared with third parties or used for advertising purposes.

If you do not sign in, all practice data remains stored locally on your device and is never transmitted anywhere.

App Preferences (if signed in)

Your app settings (appearance mode, tuner preferences, display options) are synced to our servers if you are signed in, allowing your settings to follow you across devices.

Information We Collect for Marketing (with your consent)

If you opt in to our mailing list (via our website or in-app prompts), we collect:

• Email address — used to send product updates, tips, and promotional offers

You can unsubscribe from marketing emails at any time using the unsubscribe link included in every email. Unsubscribing from marketing emails does not affect your app account.

We do not sell, rent, or share your email address with third parties for their marketing purposes.