Last updated: April 21, 2026
RHRSpark does not collect, transmit, or store any personal data on external servers. All health data stays on your devices.
RHRSpark reads heart rate and resting heart rate data from Apple HealthKit with your explicit permission. This data is used solely to display your resting heart rate trends on your watch face and in the companion iPhone app. Health data is never shared with third parties, advertisers, or analytics services.
Your heart rate data is stored locally on your iPhone and Apple Watch using Apple's secure App Group container. Data syncs between your iPhone and watch via Apple's WatchConnectivity framework — a direct, encrypted, device-to-device connection.
RHRSpark uses Apple's StoreKit for the optional Pro upgrade. Purchase transactions are handled entirely by Apple. RHRSpark does not process or store any payment information.
RHRSpark does not include any analytics SDKs, tracking pixels, crash reporting services, or advertising frameworks. There is no telemetry of any kind.
RHRSpark does not use any third-party services. The app communicates only with Apple HealthKit and Apple's StoreKit — both on-device Apple frameworks.
If you have questions about this privacy policy, please contact info (at) filamentlabs (dot) io.
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