Privacy Policy

Introduction

Welcome to 0xCal ("we," "our," or "us"). We are committed to protecting your privacy and personal data. This Privacy Policy explains how we collect, use, disclose, and safeguard your information when you use our mobile application 0xCal (the "App").

Please read this Privacy Policy carefully. By using the App, you agree to the collection and use of information in accordance with this policy.

Information We Collect

1. Health and Fitness Data

With your explicit permission, we access the following data from Apple HealthKit:

• Body measurements: Weight, height
• Activity data: Step count, active energy burned, workout sessions
• Personal characteristics: Date of birth, biological sex

This data is used to:

• Calculate your personalized daily calorie targets
• Track your fitness progress
• Provide accurate nutritional recommendations

2. Food and Nutrition Data

When you log food entries, we collect:

• Food descriptions: Text descriptions of meals you enter
• Photos: Images of food you capture for AI analysis
• Nutritional information: Calories, carbohydrates, fats, and protein values
• Conversation history: Chat messages exchanged with our AI assistant

This data is:

• Processed by our AI service to provide nutritional estimates
• Stored locally on your device in a secure database
• Used to display your daily calorie intake and nutritional breakdown

3. User Profile Data

We collect information you provide during onboarding:

• Age
• Sex
• Height
• Activity level
• Dietary goals and preferences

This data is stored locally on your device to personalize your calorie recommendations.

4. Device Information

We collect limited device information:

• Device identifier: A unique identifier used solely for rate limiting API requests
• Device type and OS version: For compatibility and debugging purposes

5. Analytics Data

We use PostHog for analytics to understand how users interact with the App. We collect:

• Usage events: App sessions, feature interactions, navigation patterns
• Subscription events: Paywall views, purchase completions (no payment details)
• Performance metrics: Error rates, app stability data

Analytics data is anonymized and does not include personal health information.

6. Subscription Data

If you subscribe to 0xCal Unlimited, subscription management is handled by RevenueCat. They may collect:

• Purchase history
• Subscription status
• Transaction identifiers

We do not have access to your payment information (credit card numbers, billing addresses). All payment processing is handled securely by Apple through the App Store.

How We Use Your Information

We use the collected information to:

1. Provide core functionality: Calculate calorie targets, analyze food, track progress
2. Personalize your experience: Tailor recommendations based on your goals
3. Process AI requests: Send food descriptions and images to our AI service for nutritional analysis
4. Improve the App: Analyze usage patterns to enhance features and fix bugs
5. Manage subscriptions: Verify subscription status and provide premium features
6. Send notifications: Remind you to log meals (if enabled)

Data Storage and Security

Local Storage

Most of your data is stored locally on your device:

• User profile and preferences
• Food entry history
• Health data from HealthKit
• Weight tracking history

Cloud Processing

The following data is transmitted to our servers:

• Food analysis requests: Descriptions and images sent to 0xcal-backend.vercel.app for AI processing
• Device ID: For rate limiting purposes only

All data transmission uses HTTPS encryption.

Data Retention

• Local data: Remains on your device until you delete the app or clear app data
• Server logs: API request logs are retained for 30 days for debugging purposes
• Analytics data: Retained according to PostHog's data retention policies

Third-Party Services

We use the following third-party services:

Your Rights and Choices

Data Access and Control

You have the right to:

• Access your data: View all data stored locally in the App
• Delete your data: Remove your account and all associated data by deleting the App
• Revoke permissions: Disable HealthKit access at any time in iOS Settings
• Opt out of analytics: Contact us to opt out of analytics tracking

HealthKit Data

You can manage HealthKit permissions at any time:

1. Go to iOS Settings > Health > Data Access & Devices
2. Select 0xCal
3. Toggle permissions on or off

Push Notifications

You can disable push notifications:

1. Go to iOS Settings > Notifications
2. Select 0xCal
3. Disable notifications

Children's Privacy

0xCal is not intended for children under 13 years of age. We do not knowingly collect personal information from children under 13. If you are a parent or guardian and believe your child has provided us with personal information, please contact us.

International Data Transfers

Our servers are located in the European Union (via Vercel and PostHog EU). If you are accessing the App from outside the EU, your data may be transferred to and processed in the EU.

Changes to This Privacy Policy

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

• Posting the new Privacy Policy in the App
• Updating the "Last Updated" date

We encourage you to review this Privacy Policy periodically.

California Privacy Rights (CCPA)

If you are a California resident, you have additional rights under the California Consumer Privacy Act (CCPA):

• Right to know what personal information we collect
• Right to delete your personal information
• Right to opt-out of the sale of personal information (we do not sell your data)
• Right to non-discrimination for exercising your privacy rights

GDPR Rights (EU Users)

If you are located in the European Economic Area, you have additional rights under GDPR:

• Right to access your personal data
• Right to rectification of inaccurate data
• Right to erasure ("right to be forgotten")
• Right to restrict processing
• Right to data portability
• Right to object to processing
• Right to withdraw consent

Contact Us

If you have questions about this Privacy Policy or our privacy practices, please contact us:

Email: support@0xcal.app

Developer: Bartek Pichalski