1Overview

DingYin (the "App") is developed and operated by Wvnew Science and Technology Co., Ltd. (中山网维软件技术有限公司, "we" or "us"). The App is an instrument tuner that runs entirely on your device. The App has no network access, contains no ads, performs no analytics reporting, and does not track you in any way. Using the App does not send any data to any server.

2Information We Collect

We collect no personal information. The App has no accounts, no analytics SDKs, no third-party advertising or tracking components, and it does not request any network communication capability.

3Microphone Use

The App requests microphone permission (iOS will ask on first use) for exactly one purpose: capturing audio in real time to compute pitch for tuning.

• Audio is processed in memory and discarded immediately after processing;
• The App never records or saves audio to any file;
• Audio is never uploaded to any server or third party;
• Microphone capture stops immediately when the App goes to the background.

You may revoke microphone permission at any time in iOS Settings → DingYin. Tuning will be unavailable, but all other features keep working.

4Locally Stored Data

The App stores only your usage preferences on your device, such as the A4 reference frequency, instrument and tuning preset selections, note-naming system, temperaments and custom offsets, and interface settings. These data never leave your device, are not synced to any cloud, and are removed entirely when you uninstall the App.

5In-App Purchase & Payment

The App offers a one-time purchase that unlocks professional features, handled entirely through Apple's In-App Purchase system. Payment is processed by Apple:

• The App never collects or stores your name, address, card details, or any payment information;
• Purchase verification uses Apple's system APIs and happens on your device;
• Refunds and Family Sharing follow Apple's terms.

6Children's Privacy

The App does not collect information from children — it collects no information from anyone, of any age.

7Third-Party Services

Apart from Apple's platform services (App Store distribution and In-App Purchase), the App uses no third-party services, SDKs, or libraries.

8Permissions Summary

9Changes to This Policy

If the App ever changes in a way that affects privacy (for example, adding data collection), we will update this policy and clearly announce it within the App. The effective date at the top of this page will be updated accordingly.

10Contact Us

If you have any questions about this Privacy Policy, please contact us at:

Operator: Wvnew Science and Technology Co., Ltd.
Email: 51525510@qq.com