Privacy Policy

Last Updated: December 2025

1. Information We Collect

1.1 Information You Provide

• Google Account Information: When you link your Google account, we collect your email address, Google ID, and display name for authentication and account synchronization purposes.
• Photos and Images: Images you capture or select for object recognition are processed locally on your device and stored temporarily in the app's cache.

1.2 Automatically Collected Information

• Device Information: Device model, operating system version, unique device identifiers, and mobile network information.
• Usage Data: App interaction data, recognition history, feature usage statistics, and error logs.
• Firebase Authentication Data: Anonymous user ID and authentication tokens for app functionality.

1.3 Third-Party Services

We use the following third-party services that may collect information:

• Google Firebase: For authentication, analytics, and crash reporting.
• Google AdMob: For displaying advertisements (collects advertising ID and interaction data).
• Google Play Billing: For processing in-app purchases.

2. How We Use Your Information

We use the collected information for the following purposes:

• Provide Core Services: Process object recognition requests and deliver recognition results.
• Account Management: Manage your linked Google account and synchronize your recognition credits across devices.
• In-App Purchases: Process purchases of recognition credit packs through Google Play Billing.
• Personalized Ads: Display relevant advertisements based on your interests (for users without credits).
• App Improvement: Analyze usage patterns to improve features and user experience.
• Customer Support: Respond to your inquiries and resolve technical issues.
• Security: Detect and prevent fraudulent activities and abuse.

3. Data Storage and Security

3.1 Local Storage

• Recognition History: Stored locally on your device in the app's private directory.
• Images: Processed images are cached locally and can be deleted at any time through app settings.

3.2 Cloud Storage

• Account Data: Your Google account link information and credit balance are stored securely on Firebase servers.
• Purchase Records: Managed by Google Play Billing infrastructure.

3.3 Security Measures

• All data transmissions are encrypted using HTTPS/TLS protocols.
• Firebase Authentication provides secure token-based authentication.
• We follow industry best practices for data protection and security.

4. Data Sharing and Disclosure

We do not sell, rent, or trade your personal information to third parties. We may share information only in the following circumstances:

• Service Providers: With Google (Firebase, AdMob, Play Billing) to provide app functionality.
• Legal Requirements: When required by law, court order, or government regulation.
• Business Transfers: In connection with a merger, acquisition, or sale of assets (users will be notified).
• With Your Consent: When you explicitly authorize data sharing.

5. AI Recognition and Image Processing

We offer two types of recognition models:

5.1 Free Local Models

• Processing: Completely offline using ONNX Runtime on your device.
• Data Privacy: Images never leave your device.
• Models: Steel pipe, bamboo stick, and rebar detection.

5.2 VIP API Models (Paid)

• Processing: Images are temporarily sent to our backend servers for AI processing.
• Data Retention: Images are processed in memory and NOT stored on our servers.
• Models: Universal object detection (DINO-X), text-based detection (Grounding DINO), and region-based detection (T-Rex).

6. Advertising

We display advertisements through Google AdMob to support the free features of our app:

• Ad Types: App Open Ads, Rewarded Ads, and Native Ads.
• User Control: Users with purchased credits will not see any advertisements.
• Ad Personalization: AdMob may collect your Advertising ID for personalized ads. You can opt out in your device settings.

7. Children's Privacy

Our app is not directed to children under 13 years of age. We do not knowingly collect personal information from children. If you believe we have inadvertently collected such information, please contact us immediately.

8. Your Rights and Choices

8.1 Access and Control

• Delete Recognition History: You can clear all local recognition history in Settings.
• Unlink Google Account: Contact us to unlink your Google account.
• Account Deletion: Request complete account deletion by contacting us.

8.2 Opt-Out Options

• Personalized Ads: Disable ad personalization in your device settings (Google > Ads > Reset advertising ID).
• Analytics: Analytics data is anonymized and cannot be individually opted out.

9. Data Retention

• Local Data: Retained until you manually delete it or uninstall the app.
• Account Data: Retained as long as your account is active.
• Inactive Accounts: May be deleted after 2 years of inactivity.
• Purchase Records: Retained according to Google Play policies and tax regulations.

10. International Data Transfers

Your information may be transferred to and processed in countries other than your country of residence, including the United States where Google's servers are located. We ensure appropriate safeguards are in place to protect your data.

11. Changes to This Privacy Policy

We may update this Privacy Policy from time to time. We will notify you of significant changes by:

• Posting the new Privacy Policy in the app.
• Updating the "Last Updated" date at the top of this policy.
• Sending a notification through the app (for material changes).

Your continued use of the app after changes become effective constitutes acceptance of the revised Privacy Policy.

12. Third-Party Links

Our app may contain links to third-party websites or services. We are not responsible for the privacy practices of these third parties. We encourage you to review their privacy policies.

13. Contact Us

14. Compliance

This Privacy Policy complies with:

• Google Play Developer Program Policies
• General Data Protection Regulation (GDPR) - for EU users
• California Consumer Privacy Act (CCPA) - for California residents
• Children's Online Privacy Protection Act (COPPA)