Privacy Policy

Last updated: April 16, 2026

Privacy Policy

Last updated: April 16, 2026

This Privacy Policy describes how Felix Thron ("we", "us", or "our") collects, uses, and protects your information when you use the Interval Timer mobile application ("App").

1. Information We Collect

1.1 Account Information

No account required. Interval Timer is fully anonymous. We do not collect names, email addresses, phone numbers, or other personal identifiers. The App does not use Apple's AppTransaction API or any other identity system.

1.2 Workout Data

When you use the timer for a workout:

  • Workout metadata (work duration, rest duration, rounds, round-by-round timing) is saved to Apple HealthKit on your device
  • Heart rate data is read from your paired Apple Watch during workouts via HealthKit
  • All workout data is stored in Apple's HealthKit database on your device
  • We do not store workout data on any server

1.3 Exercise Photos

If you create custom workout programs:

  • You may optionally capture photos of exercises using the camera
  • Photos are stored locally on your device via SwiftData
  • Photos are never uploaded, transmitted, or shared with any server or third party
  • Deleting a workout program removes all associated photos

1.4 User Settings

The App stores your preferences locally:

  • Timer settings (work duration, rest duration, number of rounds)
  • Audio and haptic preferences (voice announcements, sound alerts, haptic feedback)
  • Notification preferences (daily reminders)

Settings are shared between the iPhone app, Apple Watch app, and widgets via Apple's App Groups secure container on your device.

1.5 Apple Watch Data

If you use Interval Timer with an Apple Watch:

  • Timer settings are synced to your Watch via Apple's WatchConnectivity framework over local wireless
  • Heart rate is read from Watch sensors via HealthKit during workouts
  • No data is transmitted over the internet during Watch communication

1.6 Achievement Data

The App tracks workout milestones locally:

  • Workout streaks (consecutive days)
  • Badge achievements (e.g., "7-day streak", "30 workouts")
  • This data is stored in UserDefaults on your device and never transmitted

2. How We Use Your Information

We use collected information to:

  • Provide interval timer functionality
  • Log workouts to Apple HealthKit for your fitness history
  • Display workout statistics and achievement badges
  • Send local notification reminders (if enabled)
  • Deliver haptic alerts to your paired Apple Watch during workouts
  • Display timer status in widgets and Live Activities

3. Third-Party Services

Interval Timer uses zero third-party SDKs or services. The App contains no analytics, advertising, crash reporting, or tracking frameworks.

The only external communication is with Apple's system services:

3.1 Apple HealthKit

The App reads heart rate data and writes workout records to HealthKit. This data stays in Apple's Health database on your device. HealthKit may sync data to other devices via iCloud if you have enabled Health data sync in iOS Settings - this is controlled by Apple, not by our App.

3.2 Apple Notification Services

Local notifications are scheduled and delivered by iOS on your device. No push notification server is involved.

4. Data Storage and Security

  • Workout data is stored in Apple's HealthKit database (on-device, encrypted by iOS)
  • Custom workout programs and exercise photos are stored via SwiftData (on-device)
  • Settings and achievements are stored in UserDefaults via App Groups
  • No data is stored on external servers or cloud services
  • No data is encrypted beyond the device-level encryption provided by iOS

5. Data Retention and Deletion

  • Workouts: Stored in HealthKit indefinitely. Delete individual workouts from the History view or via the Apple Health app
  • Workout programs: Delete via the Programs view - this removes all associated exercises and photos
  • Settings: Persist for the lifetime of the app installation. Reset by deleting and reinstalling the app
  • Achievements: Stored until app is uninstalled
  • Complete data removal: Uninstalling Interval Timer removes all app data. HealthKit workouts persist in the Health app and must be deleted separately if desired

6. Children's Privacy

Interval Timer does not knowingly collect data from children under 13. The App does not require or collect any personal information regardless of age.

7. Your Rights

Under GDPR (European Economic Area)

You have the right to:

  • Access: All your data is visible within the App (workout history, settings, achievements)
  • Deletion: Delete workouts via the History view, programs via the Programs view, or uninstall the App
  • Portability: Export workouts as CSV via the share button in History
  • Restriction: You can disable HealthKit, notifications, and Watch features independently via Settings

Since Interval Timer stores all data locally on your device and does not transmit personal data to any server, most GDPR data subject requests are fulfilled by the App's built-in controls.

Under CCPA (California)

Interval Timer does not sell, share, or disclose personal information to third parties. No personal information is collected beyond what is described in this policy.

8. Changes to This Privacy Policy

We may update this Privacy Policy from time to time. Changes will be reflected in the "Last updated" date at the top of this page. Continued use of the App after changes constitutes acceptance of the updated policy.

9. Contact Information

If you have questions about this Privacy Policy, contact us at:

Felix Thron Email: felix@relivio.io