Privacy Policy

This policy explains how the StringTrue app handles information when you tune instruments, practice, purchase Pro, or request complimentary tester access. For privacy questions, contact abc1446612687@gmail.com.

Microphone and audio

StringTrue asks for microphone permission to detect pitch when you start tuning. The app processes audio on your device. It does not save microphone audio as a recording or upload it to a developer-operated server. You can deny or revoke microphone permission in Android settings. Playing reference tones, chords and metronome sounds uses locally generated audio.

Settings and practice information

Language, appearance, tuning calibration, selected instruments, favorites, custom tunings and practice plans are stored in the app’s private storage on your device. StringTrue does not require a StringTrue account and has no developer-operated account server.

Google Play purchases

Optional Pro purchases are handled by Google Play. StringTrue uses Google Play Billing to request prices, initiate purchases, query purchase status and acknowledge completed purchases. The app may receive product identifiers, purchase tokens and signed purchase records, and stores cached purchase proof locally to verify and restore access. The app does not receive your payment card number. Google Play and its billing components handle payment, service and diagnostic information under Google’s terms and privacy policy. Your Google Play account may be required for purchases and restoration.

Complimentary tester authorization

Invited testers can request permanent offline Pro access. The app creates an installation-specific key in Android Keystore and shows a request code derived from its public key. The request code is not a hardware serial number, phone number or email address. You choose whether to copy and send this code to the developer. The developer uses it to issue a signed authorization, which is stored locally and validated against the installation key. The app does not transmit the request code to an authorization server. The private installation key is not exported by the app.

If you email a request or feedback, the developer receives the information you send, including your email address and request code. Email providers process that correspondence under their own policies. This information is used to respond, issue the requested authorization or investigate the reported issue. Include only information needed for your request.

For Google Play review, the developer may provide a separate, time-limited Pro authorization. The app validates its digital signature, app version and expiry on the device, and stores the authorization and a local highest-observed time to check validity. This review authorization does not require an authorization server.

Advertising and analytics

StringTrue has no advertising SDK, developer analytics service or social feed. The app does not request location, contacts, camera or advertising identifier permissions. Google Play services and the billing SDK may communicate with Google to provide their services and diagnostics.

Children and families

StringTrue provides instrument tuning and practice tools for users of different ages. Microphone audio remains on the device. Children should ask a parent or guardian to handle purchases and any email correspondence or tester-authorization request. Parents and guardians can contact the support email with questions about information they or their child have sent. Purchases are subject to Google Play’s account and parental-approval settings.

Storage, deletion and security

You can remove local settings and cached authorization records by clearing StringTrue’s app data or uninstalling it. Doing so removes the installation-bound tester authorization and may require a new request. Purchased Pro can be checked again through the original Google Play account. To request deletion of correspondence you sent the developer, email the support address. Google-held payment and account information is managed through Google’s own controls.

StringTrue uses Android app-private storage and signed authorization records. The app’s purchase-service connections use encrypted transport. No local or online system can guarantee complete protection against a compromised device.

Changes and contact

This page may be updated when the app’s handling of information changes. The date above identifies the current policy. Contact abc1446612687@gmail.com for questions about StringTrue privacy or support.