# Privacy Policy for 21K Half Marathon AI

**Last Updated: April 29, 2026**

This Privacy Policy describes how **21K Half Marathon AI** ("we", "us", or "our") collects, uses, and shares your personal information when you use our mobile application (the "App").

## 1. Information We Collect

We collect several types of information to provide and improve our training services:

### A. Information You Provide to Us

- **Profile Information**: During onboarding, we collect your fitness level, race date, running goals, and target finish times.

- **Activity Data**: We collect details about your workouts, including activity type (run, walk, cross-train, rest), distance (km), duration (min), perceived exertion level, and any notes you choose to add.

- **Account Information**: If you sign in using Google Sign-In, we may receive your name, email address, and profile picture.

### B. Information Collected Automatically

- **Device Information**: We collect information about the device you use to access the App, including device model, operating system version, unique device identifiers, and mobile network information.

- **Usage Data**: We track your interaction with the App, such as streaks, total distance logged, and frequency of use.

### C. Location Information

- **GPS/Location Data**: If you grant permission, the App uses your location to provide mapping features and track your running routes. This data is used to show nearby runners (if enabled) and calculate workout distances accurately. You can manage location permissions at any time via your device settings.

## 2. How We Use Your Information

We use the collected data for various purposes:

- **Personalized AI Coaching**: To generate customized training plans and provide adaptive advice based on your performance and goals.

- **Progress Tracking**: To calculate your weekly mileage, streaks, and countdown to your race.

- **Notifications**: To send reminders about scheduled workouts and important training updates.

- **Subscription Management**: To process and manage your Pro/Premium subscription status via Google Play Billing.

- **App Improvement**: To analyze usage patterns and fix technical issues.

## 3. Data Storage and Security

- **Local Storage**: Much of your training data (profile, logs, and plans) is stored locally on your device using encrypted storage where possible.

- **Cloud Services**: We use **Firebase** (a Google service) to store and sync your data across devices and to manage app functions.

- **Security**: We implement industry-standard security measures to protect your data. However, no method of transmission over the internet or electronic storage is 100% secure.

## 4. Third-Party Services

We may share your information with third-party service providers to help us operate the App:

- **Google Play Services**: For authentication (Google Sign-In) and in-app purchases (Billing).

- **Firebase**: For database storage, analytics, and cloud functions.

- **AI Processing**: Anonymous performance data may be processed by third-party AI models (e.g., via Groq or OpenAI APIs) to generate your training advice. We do not share your name or contact information with these AI providers.

## 5. Your Rights and Choices

- **Access and Update**: You can update your profile information within the App settings.

- **Data Deletion**: You can reset all training data and delete your local logs via the "Reset Plan" option in Settings. To request full account deletion from our cloud servers, please contact us at the email provided below.

- **Permissions**: You can manage app permissions (Location, Notifications) through your device's system settings.

## 6. Children's Privacy

The App is not intended for use by children under the age of 13. We do not knowingly collect personal information from children. If we become aware that a child has provided us with personal information, we will take steps to delete such data.

## 7. Changes to This Policy

We may update our Privacy Policy from time to time. We will notify you of any changes by posting the new Privacy Policy on this page and updating the "Last Updated" date.

## 8. Contact Us

If you have any questions or concerns about this Privacy Policy, please contact us at:

**Email:** support@radeonryzen.com

**Website:** [https://radeonryzen.com/halfmarathon-ai](https://radeonryzen.com/halfmarathon-ai)