Privacy Policy

Last updated: February 24, 2026

1. Responsible Party

Felix Kundlacz
Rembrandtstraße 7
67061 Ludwigshafen am Rhein
Germany
Email: hello@treadsync.app

2. Data Collection Overview

TreadSync stores your workout data exclusively locally on your device.

We do NOT collect, transmit, or store your workout data on any servers. All session data (time, distance, pace, calories) remains on your device using browser localStorage.

3. Local Data Storage

This app uses:

• localStorage: Stores your workout sessions on your device
• Service Worker: Enables offline functionality (PWA)
• No tracking cookies
• No analytics tools (no Google Analytics, Facebook Pixel, etc.)

4. Payment Processing

We use Stripe for payment processing. Stripe collects and processes:

• Name and email address
• Payment information (credit card details)

We do not store your payment information. Stripe's privacy policy: stripe.com/privacy

5. Hosting

This website is hosted by:

Netlify, Inc.
2325 3rd Street, Suite 215
San Francisco, CA 94107, USA

Netlify may collect technical data (IP address, browser type) for hosting purposes. Netlify's privacy policy: netlify.com/privacy

6. File Exports

When you export your workouts, all files are generated locally in your browser:

• FIT files: Generated client-side, no server upload
• GPX files: Generated client-side, no server upload
• PDF reports: Generated client-side, no server upload
• CSV exports: Generated client-side, no server upload

Files are downloaded directly to your device. We never see or store this data.

7. Third-Party Services

Your data is only shared with:

• Stripe: Payment processing only (name, email, payment info)
• Netlify: Hosting infrastructure (technical data only)

We do not share data with Garmin, Strava, or any other fitness platforms. You manually upload exported files to these services.

8. Your Rights under GDPR

You have the right to:

• Access: Request information about stored data
• Correction: Correct inaccurate data
• Deletion: Delete your data (clear browser localStorage)
• Restriction: Restrict processing of your data
• Data portability: Export your data (CSV export)
• Object: Object to data processing

To exercise these rights, contact: hello@treadsync.app

9. Data Security

We use SSL/TLS encryption for secure data transmission. Your workout data is stored locally on your device and is only accessible to you.

10. Data Retention

Your workout data is stored in your browser's localStorage indefinitely until you:

• Clear browser data
• Uninstall the app
• Manually delete sessions in the app

11. Changes to This Privacy Policy

We may update this privacy policy from time to time. The latest version will always be available at this URL with the updated date at the top.

12. Contact

For privacy-related questions or to exercise your rights, contact:
hello@treadsync.app