RHRSpark

RHRSpark puts resting heart rate on your Apple Watch face as a sparkline, gauge, or corner complication.

WHAT YOU GET

• Three 24-hour complications you can use for free • 10 complications across 8-hour, 24-hour, 7-day, and 30-day windows with Pro • Short-term sedentary heart-rate samples and Apple's daily resting heart rate • Clear calculation notes for every complication

TWO DATA SOURCES, SHOWN CLEARLY

The 8-hour and 24-hour views use heart-rate samples that HealthKit labels as sedentary. The 7-day and 30-day views use Apple's daily resting heart-rate values. Gaps stay visible when there is no qualifying sample.

BUILT FOR THE WATCH FACE

Choose rectangular, circular, or corner complications. Each one keeps the source and time window clear so you know what you are viewing.

ONE-TIME PRO UNLOCK

Download free and use three 24-hour complications. Unlock all 10 complications for $0.99 once. No subscription, account, ads, or telemetry.

PAIR IT WITH HRVSpark

HRVSpark gives the same direct view of raw SDNN heart rate variability across useful time windows.

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

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