Legal
Privacy Policy
Last updated: February 10, 2026
Overview
Challenge 23 ("we", "our", or "the app") is committed to protecting your privacy. This policy explains how we collect, use, and safeguard your information.
Information We Collect
Account Information
When you sign in with Apple, we may receive:
- Your name (if you choose to share it)
- Your email address (or Apple's private relay email)
- A unique user identifier
Health Data
With your permission, we access:
- Heart rate data during workouts
- Resting heart rate measurements
- Workout session data
Health data is stored locally on your device and optionally synced to your private account via secure cloud storage.
Bluetooth Data
We connect to Bluetooth heart rate monitors to receive real-time heart rate data during workouts. We do not collect or store information about your Bluetooth devices.
How We Use Your Information
- To provide workout tracking and heart rate monitoring features
- To calculate training quality scores and recovery metrics
- To sync your data across your devices
- To enable group challenges with friends (if you choose to join)
Data Storage & Security
Your data is stored using Firebase (Google Cloud), which employs industry-standard encryption and security practices. Health data is encrypted both in transit and at rest.
Data Sharing
We do not sell your personal information. We only share data:
- With group members if you join a challenge group (only workout summaries you choose to share)
- With service providers (Firebase/Google) who help operate our app
- If required by law
Your Rights
You can:
- Delete your account and all associated data at any time
- Revoke HealthKit permissions in iOS Settings
- Request a copy of your data
Children's Privacy
Challenge 23 is not intended for children under 13. We do not knowingly collect information from children under 13.
Changes to This Policy
We may update this policy from time to time. We will notify you of significant changes through the app.
Contact Us
If you have questions about this privacy policy, contact us at:
Email: privacy@challenge23app.com