Privacy Policy

Scientific Calculator App

1. Introduction

This Privacy Policy describes how Scientific Calculator ("we," "our," or "us") collects, uses, and protects information when you use our mobile application. We are committed to protecting your privacy and ensuring transparency in our data practices.

2. Information We Collect

2.1 Information We DO NOT Collect

2.2 Information We Collect

We collect only minimal, non-personal information necessary for app functionality and improvement:

Analytics Data (Anonymous)

• App Usage: Which calculator functions are used (e.g., "addition", "square root", "matrix operations")
• Feature Usage: Which calculator modes are accessed (Basic, Advanced, Function, Vector, Matrix)
• Performance Data: App crashes, loading times, and technical performance metrics
• Device Information: Android version, device model (for compatibility purposes only)

Technical Data

• App Version: Version of the calculator app you're using
• Session Data: App usage duration and frequency (anonymous)
• Error Reports: Technical errors to improve app stability

3. How We Use Information

The limited data we collect is used solely for:

• App Improvement: Understanding which features are most useful to enhance user experience
• Bug Fixes: Identifying and resolving technical issues and crashes
• Performance Optimization: Improving app speed and responsiveness
• Feature Development: Planning new calculator functions based on usage patterns
• Compatibility: Ensuring the app works well across different Android devices

4. Third-Party Services

4.1 Google Play Store Version

The Google Play Store version integrates with the following third-party services:

Firebase Analytics (Google)

• Purpose: Anonymous usage analytics and app performance monitoring
• Data Collected: App usage patterns, feature usage, technical performance
• Privacy Policy: Google Privacy Policy
• Opt-out: You can disable analytics in your device's Google settings

Google AdMob

• Purpose: Display relevant advertisements to support free app development
• Data Collected: Advertising ID, device information for ad targeting
• Privacy Policy: Google Ads Privacy Policy
• Opt-out: You can reset your advertising ID in Android settings

4.2 Huawei AppGallery Version

The Huawei AppGallery version integrates with:

Huawei Analytics Kit

• Purpose: Anonymous usage analytics and app performance monitoring
• Data Collected: App usage patterns, feature usage, technical performance
• Privacy Policy: Huawei Analytics Privacy
• Note: This version is ad-free and provides a premium experience

5. Data Storage and Security

5.1 Local Storage

• Calculation History: Stored locally on your device only
• Settings: Theme preferences and calculator settings stored locally
• Memory Variables: Calculator memory (A, B, C, etc.) stored on device
• No Cloud Storage: We do not store your data on external servers

5.2 Data Security

• Encryption: All local data is stored using Android's secure storage mechanisms
• No Transmission: Your calculations never leave your device
• Secure Analytics: Only anonymous, aggregated data is transmitted for analytics
• Regular Updates: We maintain security through regular app updates

6. Permissions

Our app requests minimal permissions necessary for functionality:

Required Permissions

• VIBRATE: Provides haptic feedback when buttons are pressed (optional feature)
• INTERNET: Required for analytics and ads (Google version only)
• POST_NOTIFICATIONS: For system notifications (Android 13+ requirement)

Conditional Permissions

• WRITE_EXTERNAL_STORAGE: Only on Android 10 and below for calculation history export

7. Children's Privacy

Our app is suitable for users of all ages, including children under 13. We do not knowingly collect personal information from children. The app:

• Does not require account creation or personal information
• Does not include social features or communication capabilities
• Provides educational value for mathematical learning
• Contains no inappropriate content

8. International Data Transfers

The minimal analytics data we collect may be processed in different countries:

• Google Version: Data processed by Google's global infrastructure with appropriate safeguards
• Huawei Version: Data processed by Huawei's global HMS infrastructure
• Protection: All transfers comply with applicable data protection laws

9. Your Rights and Choices

9.1 Analytics Opt-Out

• Google Version: Disable analytics in Google Settings > Ads > Opt out of Ads Personalization
• Huawei Version: Disable analytics in Huawei device privacy settings
• App Level: Future updates may include in-app analytics toggle

9.2 Data Deletion

• Local Data: Uninstall the app to remove all local data
• Analytics Data: Contact us to request deletion of analytics data
• Calculation History: Clear within the app's history section

9.3 Access to Information

Since we collect minimal non-personal data, there is limited information to access. You can:

• Review your calculation history within the app
• Check your app settings and preferences
• Contact us for information about analytics data

10. Data Retention

• Local Data: Retained until you delete the app or clear data
• Analytics Data: Automatically deleted after 26 months (Google) or 24 months (Huawei)
• Crash Reports: Retained for 90 days to fix technical issues

11. Updates to Privacy Policy

We may update this Privacy Policy periodically to reflect:

• Changes in app functionality or features
• Updates to applicable privacy laws
• Improvements to our privacy practices

12. Legal Compliance

12.1 GDPR Compliance (European Users)

• Legal Basis: Legitimate interest for analytics and app improvement
• Data Minimization: We collect only necessary data for app functionality
• User Rights: Right to access, rectify, erase, and port data
• Consent: Clear consent mechanisms for data processing

12.2 CCPA Compliance (California Users)

• No Sale of Data: We do not sell personal information
• Data Categories: Only technical and usage data (non-personal)
• Consumer Rights: Right to know, delete, and opt-out

12.3 App Store Compliance

• Google Play: Complies with Google Play Developer Policy
• Huawei AppGallery: Complies with Huawei AppGallery Review Guidelines
• Age Rating: Suitable for all ages (PEGI 3, ESRB E)

13. Security Measures

We implement appropriate security measures to protect your information:

• Data Encryption: All data transmissions use industry-standard encryption
• Secure Storage: Local data stored using Android's secure storage APIs
• Access Controls: Limited access to analytics data with proper authentication
• Regular Updates: Security patches through regular app updates

14. Third-Party Links

Our app may contain links to third-party websites or services:

• Developer website and support resources
• Educational mathematical resources
• App store listings and reviews

Important: This privacy policy does not apply to third-party websites. Please review their privacy policies separately.

15. Business Transfers

In the unlikely event of a business transfer, merger, or acquisition:

• This privacy policy will remain in effect
• Users will be notified of any ownership changes
• Data protection standards will be maintained
• User rights and choices will be preserved

16. Governing Law

This Privacy Policy is governed by:

• Primary Jurisdiction: Laws of the developer's country of residence
• International Compliance: GDPR (EU), CCPA (California), and other applicable privacy laws
• Dispute Resolution: Good faith negotiation followed by appropriate legal channels

17. Contact Information

18. Acknowledgment

By downloading, installing, or using the Scientific Calculator app, you acknowledge that you have read, understood, and agree to be bound by this Privacy Policy.