# RHRSpark — Resting HR on Your Watch Face > Apple Watch face complications for resting heart rate visualization. (iPhone/iPad app by Joel Farthing.) - Source: https://appshunter.io/ios/app/rhrspark/id6762872980 (this page in markdown: same URL + `.md`) - Developer: [Joel Farthing](https://appshunter.io/developer/1879704683) - Category: Health & Fitness, Sports - Price: Free with in-app purchases - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 26.4 · 3 MB - Languages: English - Released: 2026-04-23 - Data updated: 2026-07-02 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/rhrspark/id6762872980/reviews.md ## What is 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. ## Key features - Resting heart rate on watch face - Sparkline, gauge, or corner complications - 10 watch face complications - 4 time window options (8H, 24H, 7D, 30D) - Two distinct data sources - Full calculation transparency ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | RHRSpark Pro | $0.99 | one-time | | Tip Jar | $4.99 | one-time | ## Frequently asked questions about RHRSpark ### What is RHRSpark? RHRSpark provides Apple Watch face complications to display your resting heart rate. It offers various styles and time windows to visualize your heart rate trends directly on your watch face. ### How does RHRSpark calculate resting heart rate? Short-term complications use sedentary heart rate samples from HealthKit in 5-minute intervals. Long-term complications display Apple's daily resting heart rate directly, ensuring data integrity. ### What are the different time windows available in RHRSpark? RHRSpark offers four time windows: 8-hour, 24-hour, 7-day, and 30-day. This allows users to view both short-term fluctuations and long-term trends in their resting heart rate. ### Is RHRSpark free to use? RHRSpark is free to download and includes three 24-hour complications. A one-time purchase of $2.99 unlocks the Pro version, offering all 10 complications across all time windows. ### Does RHRSpark have ads? No, RHRSpark does not contain advertisements. The app is free to download with optional in-app purchases for advanced features. ### What devices is RHRSpark compatible with? RHRSpark is compatible with Apple Watch, iPhone, and iPad. It is designed to leverage the capabilities of these Apple devices for heart rate monitoring. ### How often is RHRSpark updated? The latest version of RHRSpark is 1.0.4, last updated on May 13, 2026. Updates typically focus on improving functionality and adding new features based on user feedback. ### What is the age rating for RHRSpark? RHRSpark has an age rating of 4+. This indicates it is suitable for users of all ages and does not contain content inappropriate for children. ## Version history (last 2 releases) ### 1.0.4 — 2026-05-13 Adds support for showing current Pro unlock promotions in the iPhone app and Apple Watch app when a campaign is active. ### 1.0 — 2026-04-23 No release notes. ## More apps by Joel Farthing - [HRVSpark](https://appshunter.io/ios/app/hrvspark/id6759590346) All apps by Joel Farthing: https://appshunter.io/developer/1879704683 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-02.*