Privacy Policy

Last updated: March 27, 2026

Tuwa ("the app") is developed by Hanwen Ma. This policy explains what data the app collects, how it is used, and your rights.

What Data We Collect

Data you provide

  • Account information: Email address and display name (used for authentication and coach-athlete pairing)
  • Workout logs: Exercises, sets, reps, weights, RPE, session duration, and notes you enter
  • Wellness check-ins: Self-reported sleep quality, soreness, energy, and stress ratings

Data from HealthKit (read-only)

  • Heart rate variability (HRV)
  • Resting heart rate
  • Sleep duration
  • Body temperature
  • VO2 Max
  • Workout heart rate

Tuwa never writes data to HealthKit. HealthKit access is optional and requires your explicit permission.

Data we compute

Recovery scores, ACWR (Acute:Chronic Workload Ratio), training stress, and personal records are calculated on your device from the data above.

How Data Is Stored

  • On your device: All data is stored locally using SwiftData. The app works fully offline.
  • In the cloud: Composite scores (recovery score, workload snapshots, wellness ratings, workout session headers, and personal records) sync to Supabase (hosted on AWS) for coach-athlete features and multi-device access.
  • Raw HealthKit data is never uploaded. Only computed scores derived from HealthKit data are synced.

Coach-Athlete Data Sharing

If you link with a coach, they can view:

  • Your recovery scores and ACWR trends
  • Workout session summaries
  • Personal records
  • Wellness check-in ratings

Coaches cannot access your raw HealthKit data, and you can unlink from a coach at any time.

Third-Party Services

We do not use any advertising networks, analytics trackers, or third-party data brokers.

Data Retention and Deletion

Your data is retained as long as your account exists. To delete all your data:

  1. Go to Profile → Sign Out in the app
  2. Contact us at the email below to request full account and data deletion from our servers

Upon deletion, all your data — including workout logs, scores, and coach relationships — is permanently removed from our servers.

Your Rights

You have the right to:

  • Access the data we store about you
  • Request correction of inaccurate data
  • Request deletion of your account and all associated data
  • Withdraw HealthKit permissions at any time via iOS Settings → Privacy & Security → Health

Children

Tuwa is not directed at children under 13. We do not knowingly collect data from children.

Changes to This Policy

We may update this policy from time to time. Changes will be posted to this page with an updated date.

Contact

For privacy questions or data deletion requests:

Email: [email protected]