Thank you for using Duomi Compound Calculator (hereinafter referred to as “the App”).
We value your privacy and are committed to protecting your personal information.
This Privacy Policy explains how we collect, use, store, and share your information during your use of the App, along with related disclaimers.
1. Information We Collect
1.1 Local Data
The investment amount, profit rate, trading quantity, and other data you input are stored locally on your device and are only used for calculations and result display.
This data is never automatically uploaded to any server.
1.2 Cloud Sync Data (Optional)
To help you sync and back up data across multiple devices, the App provides an optional cloud sync feature:
- When enabled, your data will be securely transmitted and encrypted on Alibaba Cloud servers.
- Data is retained for 1 year, after which it will be automatically deleted.
- You may request deletion or account termination at any time, and we will process it immediately.
- If you do not enable this feature, your data remains stored only on your local device.
1.3 Analytics Data
To improve the App’s features and user experience, we integrate Umeng Analytics SDK, which may collect:
- Device information (device model, OS version, language settings, network environment)
- Usage data (feature usage frequency, session duration, click behaviors)
- Crash logs and performance data
For details, see Umeng’s Privacy Policy: https://www.umeng.com/policy
1.4 Tracking (Optional)
With your consent, the App may use an advertising identifier (IDFA or similar) for cross-app or cross-website tracking, used to:
- Analyze user sources
- Measure advertising effectiveness
You can revoke this permission anytime via Settings → Privacy → Tracking on your device.
1.5 Payment and Subscription Information
- One-Time Purchase: The App only records whether you have completed a one-time purchase to unlock features. No sensitive payment information is collected.
- Annual Subscription: The App records your subscription status and expiration date to verify your access rights.
All transactions are processed through Apple’s official payment system, and no payment account information is stored by the App.
2. How We Use Your Information
We use the information we collect for the following purposes:
- To provide and optimize calculation functions
- To improve user experience and app stability
- To offer optional cloud sync and backup services
- To analyze user behavior for product optimization and ad performance evaluation
- To verify your purchase or subscription status and ensure proper access to paid services
3. Sharing and Disclosure of Information
We do not sell your personal information to any third parties.
However, we may disclose information in the following cases:
- To comply with legal or regulatory requirements
- To protect the legitimate rights and interests of the App and its users
- To share necessary data with third-party service providers (such as Umeng Analytics and Alibaba Cloud) for analytics and service delivery purposes
4. Third-Party Services
The App may integrate the following third-party services:
- Umeng Analytics SDK – For analytics and product optimization
Privacy Policy: https://www.umeng.com/policy - Alibaba Cloud – For encrypted cloud data storage and transmission
Privacy Policy: https://www.alibabacloud.com/help/zh/legal
These service providers may independently collect device and usage data, governed by their respective privacy policies.
5. Your Choices
- You may choose whether to enable cloud sync in the App
- You can delete cloud data at any time via the App or by contacting us
- Cloud data is automatically deleted after 1 year unless renewed
- You can disable ad tracking permissions in your device settings
- You can uninstall the App at any time to clear all locally stored data
6. Children’s Privacy
The App is not intended for minors, and we do not knowingly collect personal information from children.
7. Disclaimer
The App provides users with tools for calculation, simulation, and projection. Please read the following disclaimers carefully before use:
7.1 No Investment Advice
All calculations, charts, and simulation results are purely mathematical outputs based on the parameters you enter.
They do not constitute investment advice, financial guidance, or profit guarantees.
7.2 Risk of Use
Simulated data cannot fully reflect real market fluctuations or predict future economic changes.
Users should exercise independent judgment before acting on any results.
7.3 Limitation of Liability
The developer assumes no legal or financial responsibility for any decisions or consequences resulting from your use of the App.
7.4 Professional Guidance
We recommend that you consider your financial situation and risk tolerance carefully, and consult a licensed financial advisor or professional if needed.
8. Policy Updates
This Privacy Policy may be updated to reflect functional changes, legal requirements, or business adjustments.
The updated policy will be released with new versions of the App and will take effect immediately.
9. Contact Us
If you have any questions or suggestions regarding this Privacy Policy or the disclaimers, please contact us:
WeChat Official Account: 金金多米说
Email: jafu_jin@hotmail.com