HRV-Tracker
HRV and Stress monitoring
Free · In‑App Purchases
HRV Tracker — 100% Free
SDNN, RMSSD, all-day Stress, Recovery score and Energy from your Apple Watch. Free, no ads, no subscription.
HRV Tracker — native iPhone & Apple Watch app that turns heart rate variability into actionable health insights.
OVERVIEW
HRV Tracker reads your HRV from Apple Health and presents it through clean, scientific visualizations: an all-day stress curve, an Energy (Body Resources) reserve, a nightly Sleep Score, and a personalized Recovery score. It tracks both SDNN (Apple's standard HRV metric) and RMSSD (from raw beat-to-beat intervals) for a complete view of autonomic nervous system activity.
iOS APP
• Five views: Home, SDNN, RMSSD, Stress, and Energy
• Dual HRV metrics (SDNN + RMSSD) side by side
• All-day Stress curve combining heart rate and HRV, with sleep and workouts overlaid
• All-day Energy reserve that drains under stress and recharges with rest and sleep
• Nightly Sleep Score blending duration, continuity and HRV-based restfulness
• Personalized Recovery score from your 7-day baseline
• Age-adjusted zones using research-backed thresholds
• Daily, weekly, monthly and yearly trends with interactive charts
APPLE WATCH APP
• Native app with circular Recovery and Stress gauges
• Inline SDNN and RMSSD values at a glance
• Statistical Z-score analysis vs your personal 7-day baseline
• Dedicated SDNN, RMSSD and Stress chart complications with live data
• RMSSD computed in real time from raw RR intervals (heartbeat series)
• Background processing with optimized battery usage
• Supports Graphic Corner, Circular, Bezel, Rectangular and Extra Large
DATA REQUIREMENTS
Important: This app delivers meaningful insights only when AFib History is enabled on your Apple Watch (Watch app › Heart › AFib History). It greatly increases beat-to-beat data collection, providing the rich dataset needed for accurate stress curves, energy tracking, statistics and personal baselines. Without it, measurements are too infrequent for reliable trends, stress, energy or recovery.
KEY FEATURES
All-Day Stress
• Continuous 0–100 score computed at every heart-rate sample for a dense intraday curve
• Two signals weighted 50/50: your RMSSD ranked against your history, and your heart-rate reserve
• Smoothed trend showing how stress builds and fades through the day
• Sleep shaded, workouts excluded, so it reflects genuine autonomic stress
• Watch-off periods clearly greyed out
Energy — Body Resources
• An all-day 0–100 reserve showing how much you have "in the tank"
• Depletes with stress and effort, recharges during genuine calm and sleep
• Sleep-stage aware: deep sleep restores most, REM least
• Fully reproducible from Apple Health — no stored state, always consistent
Sleep Score
• A 0–100 score for last night, on the Home card and a history screen
• Blends duration (40%), continuity (30%) and restfulness (30%, from your overnight HRV)
• Colour-banded poor/fair/good/excellent, with per-night history and averages
Dual HRV Metrics
• SDNN: standard deviation of NN intervals from Apple Health
• RMSSD: root mean square of successive differences, from raw heartbeat series
• Side-by-side on iPhone and Apple Watch
Smart Recovery Scoring
• One unified Recovery score across iPhone and Apple Watch
• Based on your RMSSD trend vs a personal 7-day rolling baseline
• Filtered baselines that exclude statistical outliers
• Adaptive algorithm that improves as it learns your patterns
Visualization
• Daily, weekly, monthly and yearly trends with interactive charts
• Filtered baselines and personal historical ranges
• Color-coded zones inspired by heart-rate training systems
All HRV data stays on-device and integrates with Apple Health. Nothing is sent to external servers — complete privacy of your health information.
For health-conscious individuals, athletes and wellness enthusiasts seeking evidence-based recovery and stress insights through HRV. Requires Apple Watch with AFib History enabled for optimal functionality.
NEW — Energy (Body Resources)
A new all-day energy reserve (0–100) showing how much you have "in the tank." It drains with stress and physical effort and recharges during genuine calm and sleep — with deep sleep restoring the most. Available as a dedicated view and a tile on Home.
NEW — Sleep Score
A nightly 0–100 score for last night, blending sleep duration, continuity and HRV-based restfulness. See the full breakdown on the Home card and follow your trend on the new history screen.
IMPROVEMENTS
• Refined Stress, Recovery and HRV metrics for more consistent results across iPhone and Apple Watch
• Clearer charts and trend visualizations
BUG FIXES
• Fixed cases where a watch complication could keep showing an outdated measurement after a background refresh
• More reliable background updates — a new reading is no longer lost if a secondary calculation is interrupted
• Recovery score now stays accurate when updated in the background
• Various stability and performance improvements
Thank you for using HRV Tracker!
The developer, Philippe Gerin, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Philippe Gerin
- Size
- 8.5 MB
- Category
- Lifestyle
- Compatibility
Requires iOS 18.6 or later.
- iPhone
Requires iOS 18.6 or later. - iPad
Requires iPadOS 18.6 or later. - Apple Watch
Requires watchOS 11.6 or later.
- iPhone
- Languages
- English
- Age Rating
9+
- 9+
- Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Platinum Supporter $44.99
- Gold Supporter $11.99
- Silver Supporter $4.99
- Bronze Supporter $1.99
- Gold Supporter $11.99
- Platinum Supporter $44.99
- Bronze Supporter Tier $1.99
- Silver Supporter $4.99
- Copyright
- © 2026 Philippe Gerin. All rights reserved.