Last updated: September 2, 2026
HRVSpark does not collect, transmit, or store any personal data on external servers. All health data stays on your devices.
HRVSpark reads Heart Rate Variability (HRV) data from Apple HealthKit with your explicit permission. This data is used solely to display your HRV trends on your watch face and in the companion iPhone app. HRV data is never shared with third parties, advertisers, or analytics services.
Your HRV 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.
HRVSpark uses Apple's StoreKit for the optional Pro upgrade. Purchase transactions are handled entirely by Apple. HRVSpark does not process or store any payment information.
HRVSpark does not include any analytics SDKs, tracking pixels, crash reporting services, or advertising frameworks. There is no telemetry of any kind.
HRVSpark may request a small configuration file from filamentlabs.io to display current product messages. The request does not contain HealthKit data.
If you have questions about this privacy policy, please contact [email protected].
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