HRVSpark

HRVSpark puts your raw heart rate variability (HRV) data on your Apple Watch face as a sparkline, gauge, or corner complication.

WHAT YOU GET

• An 8-hour raw HRV complication you can use for free
• 24-hour, 7-day, and 30-day Pro views
• SDNN readings from Apple Health, with gaps left visible
• An iPhone companion app with a live gallery and install guidance

RAW DATA, NO SCORE

HRVSpark shows the SDNN measurements saved in HealthKit without turning them into a readiness, stress, or recovery score. See your values across useful time windows and decide what matters to you.

BUILT FOR THE WATCH FACE

The complications are designed for quick checks on the wrist. Longer windows add context while keeping the measurements visible.

ONE-TIME PRO UNLOCK

Download free and try the 8-hour complication. Unlock every complication for $0.99 once. No subscription, account, ads, or telemetry.

PAIR IT WITH RHRSpark

RHRSpark gives the same direct view of resting heart rate, with short-term sedentary samples and Apple's daily resting heart rate for longer windows.

HealthKit data stays on your devices and moves only between your paired iPhone and Apple Watch through Apple frameworks. HRVSpark may request a small configuration file from filamentlabs.io to display current product messages. The request contains no HealthKit data.

HRVSpark is for informational purposes only. It does not provide medical advice or diagnose, treat, cure, or prevent any medical condition.