Privacy Policy

StringLab

Last updated: June 2, 2026

Overview

StringLab ("the App") is a chromatic and instrument tuner for guitar and bass. We are committed to your privacy. This policy explains what data the App handles and where it goes. The short version: the App processes microphone audio entirely on your device to detect pitch — that audio is never recorded, stored, or transmitted, and the App has no user accounts, no analytics, no advertising, and no third-party tracking.

Microphone & Audio

Tuning requires access to your microphone. When you are tuning, the App listens to your instrument and analyzes the sound in real time, on your device, to estimate the pitch. The audio is processed locally and discarded immediately — it is not recorded, not saved, and not sent to us or anyone else. The microphone is only active while a tuner screen is open and listening.

Data Stored Only on Your Device

The App stores the following locally on your device (in standard app storage). It is never transmitted to us:

• Tunings and custom tunings you create or select.
• Instrument rigs and setups you save.
• App settings and preferences — reference pitch (A4), gauge style, theme, sensitivity, and similar options.

In-App Purchases

StringLab Pro is an optional one-time purchase. Purchases are processed entirely by Apple's App Store (StoreKit). The App receives only your entitlement status (whether Pro is active) so it can unlock the corresponding features. We do not collect, see, or store your payment details, card information, or Apple ID. Apple's handling of purchase data is governed by Apple's Privacy Policy.

Information We Do Not Collect

• We do not record, store, or transmit microphone audio.
• We do not run analytics or behavioral tracking. There are no third-party analytics SDKs in the App.
• We do not show third-party ads, use the advertising identifier (IDFA), or share data with advertisers.
• We do not require you to create an account, and we do not collect your name, email, contacts, or location.

Children's Privacy

The App is not directed at children under 13. We do not knowingly collect personal information from children.

Changes to This Policy

We may update this Privacy Policy from time to time. The "Last updated" date at the top of this page reflects the most recent revision. Material changes will be communicated within the App or on this page.

Contact

For privacy questions, please open an issue at github.com/21digitalai/policies or contact us via the support URL listed on the App's App Store page.

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