Memory Calculator Privacy Policy
Last Updated: May 9, 2026
1. Introduction
Welcome to Memory Calculator (hereinafter referred to as “the App”). This Privacy Policy is intended to inform you about how we collect, use, store, and protect your personal information. By using the App, you agree to the terms of this Privacy Policy.
2. Information Collection
2.1 Information We Collect
The App may collect the following types of information:
| Information Type | Purpose | Required |
|---|---|---|
| Calculation History | Store your calculation records locally for history feature | Yes (Core Feature) |
| Currency Exchange Rates | Cache exchange rates for offline currency conversion | No |
| Device Information | App crash analysis and performance optimization | No |
| Advertising Identifier | Display personalized ads via Google AdMob | No |
2.2 Information We Do NOT Collect
- Your name, email address, or other personal identification information
- Your calculation content or results
- Your location information
- Your contact information
- Your financial data (all calculations are performed locally)
3. Permissions
3.1 Network Permission (android.permission.INTERNET)
Purpose: Allows the app to fetch currency exchange rates and display ads.
Required: No, the app works offline with cached data.
3.2 Storage Permission
Purpose: Allows the app to store calculation history and cached exchange rates locally.
Required: Yes, for history and offline features.
4. Data Storage
4.1 Local Storage
- All calculations are performed locally on your device
- Calculation history is stored in a local SQLite database on your device
- Currency exchange rates are cached locally for offline use
- We do not upload your calculation data to any server
4.2 Offline-First Design
The App is designed to work offline:
- Basic calculator: Works completely offline
- Scientific calculator: Works completely offline
- Unit converter: Works completely offline
- Currency converter: Works offline with cached rates (rates may be outdated)
- Financial calculator: Works completely offline
- History: Stored locally, available offline
5. Third-Party Services
5.1 Google AdMob
The app displays banner ads through Google AdMob:
| Service Provider | Purpose | Privacy Policy |
|---|---|---|
| Google AdMob | Display banner ads | https://policies.google.com/privacy |
What Google AdMob may collect:
- Device information (model, OS version)
- Advertising identifier (for personalized ads)
- General location (country/region level)
Your choices:
- You can opt out of personalized ads in your device settings
- You can reset your advertising identifier in device settings
5.2 Exchange Rate Data
Currency exchange rates are fetched from public APIs. We do not control these third-party services.
6. Data Security
We take reasonable security measures to protect your information:
- All calculation data is stored locally in the app sandbox
- Network connections use HTTPS encryption
- No sensitive personal data is transmitted to our servers
- Regular security updates to prevent unauthorized access
7. Children’s Privacy
This App is not intended for children under 13 years of age. We do not knowingly collect personal information from children. If you believe we have collected information from a child, please contact us.
8. Data Retention
- Calculation History: Stored locally until you delete it within the App
- Cached Exchange Rates: Automatically updated when online, retained for offline use
- Ad Data: Managed by Google AdMob according to their policies
9. Your Rights
You have the right to:
- Access: View your calculation history within the App
- Delete: Clear your calculation history in App settings
- Opt-out: Disable personalized ads in device settings
- Uninstall: Remove all local data by uninstalling the App
10. Changes to This Policy
We may update this Privacy Policy from time to time. We will notify you of any changes by:
- Updating the “Last Updated” date
- Posting the new Privacy Policy on this page
We encourage you to review this Privacy Policy periodically.
11. Contact Us
If you have any questions or suggestions about this Privacy Policy, please contact us:
- Email: huanggang7895123@gmail.com
- App Name: Memory Calculator
- GitHub: https://github.com/kennthsHG/memory_calculator
12. Open Source Licenses
This App uses the following open-source packages:
- Flutter Framework (BSD License)
- Provider (MIT License)
- Drift (MIT License)
- go_router (BSD License)
- decimal (BSD License)
- math_expressions (MIT License)
- google_mobile_ads (Apache License)
© 2026 Memory Calculator. All rights reserved.