Privacy Policy

Last updated: March 17, 2026

This Privacy Policy explains how Wei Wenxin ("Developer", "we", "us") collects, uses, and protects your information in the mobile application "SnapCal" ("the App").

1. Information We Collect

Information we do NOT collect: Name, email address, phone number, location data, contacts, or any other personally identifiable information. The App has no user account system and does not store any data on our servers.

2. How We Handle Photos

When you take a food photo or select one from your photo library, the following process occurs:

1. The photo is compressed and Base64-encoded on your device
2. Sent via HTTPS to our backend server (Google Cloud Run)
3. Forwarded to Google's Gemini API for food recognition, calorie, and nutrition analysis
4. Analysis results are returned to you, and the photo is immediately discarded

We do not store, log, or retain photos on our servers or Google's servers. Photos exist in server memory only during processing (typically a few seconds).

3. How We Handle HealthKit Data

The App integrates with Apple HealthKit to access calorie burn data in read-only mode. HealthKit data:

• Is used only on your device and is never transmitted externally
• Is never shared with our servers or any third-party services
• Is never used for advertising or marketing purposes
• Is used solely to display calorie goals and progress on your device

4. Third-Party Services

We share data with the following third-party services. Each service processes data according to its own privacy policy.

By using the App, you consent to your food photos being sent to Google's Gemini API for food recognition purposes. Google processes data according to the Google Privacy Policy.

5. Data Security

• All data transmissions use HTTPS/TLS encryption
• No user photos or personal data are stored on servers
• All user data is stored locally on your device only
• API keys are stored in Google Cloud Secret Manager and are not included in client code

6. Data Retention

• Photos: Not retained on servers — immediately discarded after real-time processing
• Meal logs & usage data: Stored on device only. Deleted when you uninstall the App
• HealthKit data: Not stored within the App. Data in Apple HealthKit is managed by Apple
• Purchase data: Managed by Apple per Apple's data retention policies
• Ad data: Managed by Google AdMob per Google's data retention policies

7. Your Rights

• Data deletion: Since we do not store photos or personal data on our servers, there is no server-side data to delete. Uninstalling the App removes all data from your device.
• Revoke HealthKit access: Go to Settings > Health > Data Access & Devices to revoke SnapCal's access.
• Opt out of personalized ads: Go to Settings > Privacy & Security > Tracking on your device.
• Withdraw consent: You may stop using the App at any time.
• Information requests: Contact us for questions about data handling.

8. Children's Privacy

The App is not intended for children under 13 (or the applicable age of consent in your jurisdiction). We do not knowingly collect personal information from children.

9. Changes to This Policy

This Privacy Policy may be updated from time to time. Changes will be posted on this page with an updated revision date. Continued use of the App after changes constitutes acceptance of the revised policy.