RHRSpark

See your resting heart rate at a glance on your Apple Watch face — as a live sparkline, gauge, or corner complication.

WHAT YOU GET
• 10 watch face complications across rectangular, circular, and corner styles
• 4 time windows: 8-hour, 24-hour, 7-day, and 30-day
• Two distinct data sources: granular sedentary heart rate (8H/24H) and Apple's daily resting heart rate (7D/30D)
• Full calculation transparency — every complication explains exactly how its number was derived

HOW IT WORKS
Short-term complications (8H, 24H) use only heart rate samples that Apple HealthKit labeled as sedentary, bucketed into 5-minute intervals. Gaps in the sparkline mean there was no qualifying sedentary data — RHRSpark shows the gap honestly rather than filling it in.

Long-term complications (7D, 30D) display Apple's own daily resting heart rate directly. No transformation, no reinterpretation. The same number you'd find in Apple Health, presented as a trend.

SIMPLE PRICING
Free to download with three 24-hour complications. $2.99 one-time unlock for Pro — all 10 complications across all four time windows. No subscriptions, no accounts.

BUILT BY FILAMENT LABS
From the makers of HRVSpark. Same philosophy: a window, not a verdict. Your data, not our opinion.