Privacy Policy
Last updated: 6 August 2026
EarString ("the app") is a guitar practice tool that runs its audio analysis — tuner, chord detection, beat tracking, and stem separation — entirely on your device. This policy explains what the app accesses and what leaves your device.
Summary
EarString does not collect personal data, has no accounts, no advertising, and no third-party analytics or tracking. Your audio files and all analysis stay on your device. The only data that leaves your device is described below (optional online lyrics lookup and Apple's purchase processing).
Your audio and analysis stay on-device
- Audio files you open, and everything derived from them (detected chords, beats, key, separated stems, loops, EQ settings) are processed and stored only on your device.
- Stem separation and all machine-learning models run locally — your music is never uploaded for analysis.
- The microphone (used by the chromatic tuner and live chord feedback) is processed live on-device and never recorded or transmitted.
Optional online lyrics lookup
If you use the online lyrics feature, the app sends the track title and artist name you are viewing to the public LRCLIB lyrics service in order to fetch matching lyrics. No audio, no account information, and no identifiers are sent. This request is only made when you use the lyrics feature; it can be turned off in the app's settings.
Purchases (EarString Pro)
EarString Pro (subscription or one-time unlock) is sold and processed by Apple through the App Store. Payments and subscription management are handled entirely by Apple — we never see or store your payment information. The app only receives from Apple a cryptographically verified confirmation of whether you own Pro, which is kept on your device.
Data we do NOT collect
We do not collect, log, or transmit:
- Personal information (name, email, contacts)
- Your audio files or recordings
- Location data
- Usage analytics, diagnostics, or crash tracking
- Advertising or tracking identifiers
Children's privacy
The app does not knowingly collect any data from anyone, including children under 13.
Changes to this policy
If this policy changes, the updated version will be posted at this same URL with a new "Last updated" date.
Contact
For any questions about this policy, contact: taikatalvi13@gmail.com