Privacy Policy

1. Introduction

Lịch Vạn Niên (Âm Lịch) is a mobile application that provides lunar and solar calendar lookup, auspicious date reference, prayers, fortune-related content, feng shui reference, and other daily utilities. When you use the app, we may collect limited information necessary to operate the app, improve user experience, support technical maintenance, display ads when applicable, and maintain service quality.

2. Information We May Collect

When you use the app, we may collect the following categories of information:

• Device and technical information: such as device type, operating system, app version, language, approximate IP-based location, crash logs, diagnostics, and device identifiers or advertising identifiers if permitted by your device settings.
• Usage information: such as screens viewed, features accessed, frequency of use, session activity, and basic interactions used to improve app performance and user experience.
• User-provided or locally stored content: such as notes, countdown events, interface preferences, or other information you choose to save while using optional features in the app. Depending on the feature design, this data may be stored locally on your device or processed through technical service infrastructure.
• Third-party service data: if the app uses advertising, analytics, crash reporting, or embedded web content, those service providers may process certain technical data in accordance with their own privacy policies.

3. How We Use Information

We may use collected information for the following purposes:

• To operate, maintain, and improve the app and its features.
• To remember user preferences and personalize certain display settings.
• To analyze feature usage and improve content, layout, and usability.
• To detect errors, diagnose technical issues, and maintain app stability.
• To display advertising or sponsored content when applicable.
• To comply with legal obligations and protect legitimate rights, safety, and interests.

4. User-Generated Content

Some optional features, such as notes, countdown events, or saved preferences, may allow you to create or store content. We recommend that you do not enter highly sensitive personal information into the app. We only process such data as necessary to provide the feature you choose to use.

5. Ads and Third-Party Services

The app may use third-party services for advertising, analytics, diagnostics, or service operations. These providers may process certain technical data in accordance with their own privacy policies.

In some areas of the app, content may be displayed through in-app webviews. These webviews may load content from our own servers, operated by our team, in order to deliver app features and content updates.

Third-party services may include, but are not limited to:

• In-app advertising providers.
• Analytics and usage measurement services.
• Crash reporting and technical diagnostics services.

When you interact with third-party ads or services, the processing of your information may also be subject to the privacy policies of those providers.

6. Cookies, SDKs, and Similar Technologies

The app and its integrated service providers may use SDKs, local storage, advertising identifiers, or similar technologies to remember preferences, measure app performance, support diagnostics, and provide advertising functionality.

7. Data Security

We use reasonable technical and organizational measures to protect information against unauthorized access, misuse, loss, or unintended alteration. However, no method of transmission or storage is completely secure, and we cannot guarantee absolute security in all circumstances.

8. Your Rights

Depending on your location and applicable law, you may have the right to:

• Request information about the data being processed.
• Request correction or deletion of data where legally applicable.
• Withdraw consent for certain types of data processing, such as advertising-related tracking, where supported.
• Contact us regarding privacy-related questions or requests.

9. Children's Privacy

The app is not intended to knowingly collect personal information from children in violation of applicable law. If you believe that a child has provided personal information through the app, please contact us so that we can review and address the situation appropriately.

10. Changes to This Policy

We may update this Privacy Policy from time to time to reflect changes in features, technology, legal requirements, or service operations. Any updated version will be posted on this page together with its effective date.