About this app
HRVSpark puts your raw Heart Rate Variability data directly on your Apple Watch face as a beautiful, glowing sparkline complication. WHAT YOU GET • Free 8-hour raw HRV sparkline complication with your latest SDNN reading • Pro 24-hour, 7-day, and 30-day complication views for broader context • Circular gauge and corner complications built for glanceable watch-face use • Clean iPhone companion app with live gallery, install guidance, and detail views WHY RAW? Most HRV apps bury your data behind opaque "readiness scores" and color-coded stress labels. HRVSpark skips the interpretation layer entirely. You see the actual numbers — and over time, you build your own intuition about what your data means. BUILT FOR YOUR WRIST HRVSpark is complication-first. It was designed from day one to live on your watch face, not behind an app icon. Glance at your wrist and immediately see your trend. PAIR IT WITH RHRSpark Our sister app RHRSpark brings the same no-scores, no-verdicts philosophy to resting heart rate, giving you a complementary baseline view alongside HRVSpark. SIMPLE, HONEST PRICING Free to try with a one-time Pro unlock. No subscriptions. No tracking. No ads. Ever.
Latest release
What’s New
Adds support for showing current Pro unlock promotions in the iPhone app and Apple Watch app when a campaign is active.
Audience growth
Ratings growth
Baseline captured. Growth appears after the crawler observes a changed rating count.
Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.
Price tracking
Price intelligence
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Sep 1, 2026 · 2:28 PM Free
Screenshots
