1. Information We Collect

1.1 Calculation Data

The Exact Metal Weight Calculator stores the following information locally on your device when you save calculations:

Data Type	Description	Storage Location
Metal Type & Properties	Name and density of selected metals (e.g., Steel, Aluminum, Copper)	Local SQLite Database
Shape Dimensions	Measurements entered for various metal shapes (diameter, width, height, etc.)	Local SQLite Database
Calculation Results	Computed weight, length, and total calculations	Local SQLite Database
Measurement Units	Selected units (mm, cm, inches, feet)	Local SQLite Database
Quantity & Pricing	Number of pieces and optional price per kg/gram (if entered)	Local SQLite Database
Timestamps	Date and time when calculations were saved	Local SQLite Database
User Notes	Optional text notes added to calculations	Local SQLite Database

1.2 App Preferences

The app may store user preferences locally including:

• Default measurement units
• Preferred calculation modes
• Theme and display settings

2. How We Use Your Information

All data collected by the Exact Metal Weight Calculator is used exclusively for the following purposes:

• Calculation History: Store and retrieve your previous metal weight calculations
• PDF Generation: Create detailed calculation reports when you choose to export
• App Functionality: Remember your preferences and settings between app sessions
• Search & Organization: Allow you to search through your saved calculations

3. Data Storage & Security

3.1 Local Storage

Your data is stored using the following secure, industry-standard technologies:

• SQLite Database: Calculation records are stored in an encrypted local database
• Shared Preferences: App settings stored using platform-specific secure storage
• Application Documents Directory: All data remains within the app's private storage area

3.2 Data Security Measures

• Data is stored within the app's private sandbox, inaccessible to other applications
• No network transmission of personal or calculation data
• Regular app updates include security improvements
• Database operations use parameterized queries to prevent injection attacks

4. Data Sharing & Third Parties

4.1 Optional Data Export

You have complete control over data sharing through these optional features:

• PDF Export: Generate calculation reports that you can manually share
• Device Sharing: Use your device's built-in sharing capabilities to send PDF reports
• Local File Storage: Save PDF reports to your device for manual distribution

5. Third-Party Services & Dependencies

The app uses the following third-party libraries and services:

Service/Library	Purpose	Data Access
Flutter Framework	App development platform	No data transmission
SQLite (sqflite)	Local database storage	Local storage only
PDF Generation (pdf)	Create calculation reports	Local processing only
Path Provider	Access device file system	App directories only
Share Plus	Native sharing functionality	User-initiated sharing only
Shared Preferences	Store app settings	Local storage only

6. Advertising & Analytics

6.1 Google AdMob

The app integrates with Google Mobile Ads (AdMob) which may collect:

• Device identifiers (Advertising ID)
• App usage statistics
• General location information (country/region)
• Device and network information

For detailed information about Google's data practices, please review:

• Google Privacy Policy
• AdMob Privacy Information

6.2 Advertising Controls

You can control advertising personalization through your device settings:

• Android: Settings > Google > Ads > Reset advertising ID or Opt out of personalized ads
• iOS: Settings > Privacy & Security > Apple Advertising > Personalized Ads

7. Your Rights & Controls

7.1 Data Management

You have complete control over your data with the following capabilities:

• View All Data: Browse all saved calculations in the "Saved Calculations" section
• Edit Records: Modify or update any saved calculation
• Delete Individual Records: Remove specific calculations you no longer need
• Clear All Data: Delete all saved calculations at once
• Export Data: Generate PDF reports of your calculations
• App Uninstall: Removing the app permanently deletes all stored data

7.2 Data Portability

Your calculation data can be exported in the following formats:

• PDF Reports: Detailed calculation summaries with all parameters and results
• Manual Export: All data is viewable within the app for manual transcription if needed

8. Data Retention

Data retention is entirely under your control:

• Indefinite Storage: Calculations remain saved until you choose to delete them
• No Automatic Deletion: We do not automatically delete any of your data
• Complete Removal: Uninstalling the app removes all associated data
• No Recovery: Once deleted (manually or through uninstall), data cannot be recovered

9. Children's Privacy

This app is designed for professional and educational use in metal fabrication and engineering. While suitable for educational purposes:

• We do not knowingly collect personal information from children under 13
• The app operates entirely offline with no personal data collection
• No user accounts or personal information are required
• Parents and educators can safely use this app with children for educational purposes

10. Changes to Privacy Policy

We may update this privacy policy to reflect changes in our practices or for legal compliance. When we make changes:

• Updated policy will be included in app updates
• Significant changes will be highlighted in update notes
• Continued use of the app after updates constitutes acceptance
• You can review the current policy version within the app

11. International Data Transfers

The only exception is advertising data collected by Google AdMob, which may be transferred according to Google's privacy policies and your device settings.

12. Contact Information

13. Legal Basis for Processing (GDPR)

For users in the European Union, our legal basis for processing data is:

• Legitimate Interest: Providing core app functionality and calculation storage
• Consent: Advertising data collection through Google AdMob (can be withdrawn)
• Contract Performance: Delivering the calculation services you expect

GDPR Rights

Under GDPR, you have the right to:

• Access your data (view all calculations in the app)
• Rectify your data (edit calculations)
• Erase your data (delete calculations or uninstall app)
• Port your data (export to PDF)
• Object to processing (opt out of personalized ads)