HRV Watch: Stress & Recovery3.1.0 - App Store

HRV Watch shows your Apple Health heart rate variability on iPhone and Apple Watch. Follow your history, compare sleep and mindfulness readings separately, and see changes against your own personal baseline.

Understand your readings
- Daily values, a personal range and the number of readings behind each day
- Separate views for all readings, sleep and mindfulness
- Tap a chart point to explore the day and its individual readings
- HRV basics, chart explanations, methods and sources in the app
- Home Screen and Lock Screen widgets, Apple Watch complications, and configurable notifications

SDNN and RMSSD stay separate
The app supports SDNN and, on iOS 27 or watchOS 27, native RMSSD readings when available in Apple Health. Each metric has its own history and baseline. SDNN is not converted into RMSSD. Missing readings are not replaced with invented values.

HRV measures variation in the time between heartbeats. Measurement duration and conditions affect the values. One high or low reading does not establish stress, recovery or illness.

Context, not a diagnosis
Sleep, resting heart rate, respiratory rate, wrist temperature and workouts provide context when those data are available. The app's readiness estimate uses HRV and resting heart rate relative to your baseline. It is not Apple's readiness score or a medical assessment. Without enough data, the estimate stays unavailable.

Getting started
Allow read access to the relevant Apple Health data. The app displays existing measurements; it does not measure HRV itself or replace a sensor. Requires iOS 18 and watchOS 11 or later. RMSSD additionally requires iOS 27 or watchOS 27 and native readings in Health; not every Apple Watch provides them.

Optional AI explanations
If you enable AI data sharing, selected health and workout values are sent to OpenAI to generate explanations. Baselines and readiness estimates are calculated by the app, not by AI. The Watch's day details use local context without an automatic AI request.

Medical disclaimer
HRV Watch is a tool for personal trends, not medical diagnosis or treatment. Seek qualified medical advice for health questions and before medical decisions.

Scientific references available in the app:
- HRV standards: https://pubmed.ncbi.nlm.nih.gov/8598068/
- HRV review: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5624990/
- AHA heart rate guidance: https://www.heart.org/en/healthy-living/fitness/fitness-basics/target-heart-rates

Terms: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Version History New in 3.1:
- Focused HRV views on iPhone and Apple Watch: today, history and day details.
- SDNN and native RMSSD readings stay separate. RMSSD requires iOS 27 or watchOS 27 and corresponding Apple Health data.
- Clearer personal comparisons, reading counts, gaps and missing values.
- On iPhone: HRV basics, methods, individual readings and additional charts to explore your data.
- Removed the Watch's custom breathing timer. HRV Watch displays existing Health readings; it does not measure HRV itself.
- Watch day details now use local context instead of an automatic AI request. 3.1.0 36m ago New in 3.0: a personal HRV baseline, nervous-system context, clear trend interpretation, calmer widgets, and focused notifications. This build also completes English localization across the app, Watch, widgets, notifications, and AI insights. 3.0.1 Aug 18 New in 3.0: a personal HRV baseline, nervous-system context, clear trend interpretation, calmer widgets, and focused notifications. This build also completes English localization across the app, Watch, widgets, notifications, and AI insights. 3.0.0 Aug 11 This update prevents a potential crash during HealthKit background updates on Apple Watch. 2.13.1 Jul 21 This update improves Apple Watch HRV updates:

- Apple Watch now listens for new HRV readings and can notify you as soon as HealthKit delivers a new HRV value.
- The HRV view on Apple Watch now shows the last 5 individual HRV readings with time, source, and value.
- Improved background handling so new HRV data refreshes widgets and readiness context more directly. 2.13 Jun 15 This update makes HRV Watch clearer and more reliable:

- HRV now surfaces the newest reading more clearly instead of confusing it with daily averages.
- Dashboard, detail pages, Apple Watch app, and widgets now show HRV/RHR more clearly against personal normal ranges and baselines.
- New mindful session summary on the dashboard: recent sessions, matched HRV value, and baseline-band assessment.
- Mindful HRV detection is more robust, including HRV values written shortly after a mindful session.
- After a mindful session, the app can send a push with the HRV value and assessment.
- The morning push now reminds you to start a short mindful session for a more reliable HRV reading.
- AI evaluations are no longer generated automatically; they run only when you tap the button.
- HRV, RHR, Recovery Ratio, and Readiness charts are easier to read and less misleading. 2.11 May 12 This update improves scientific consistency and chart readability:

- RHR chart redesign: baseline band (P25-P75), dynamic y-axis, clearer legend, plus markers for above/below baseline band and outliers.
- More robust readiness/recovery scoring based on personal baselines:
readiness is a relative 0-100 signal (around 50 = baseline), recovery ratio is centered around 1.0.
- Better baseline quality handling: mindful-aware baseline selection and neutral fallback when history is too sparse.
- AI feedback prompts were tightened to be clearer, data-bound, and evidence-aware. 2.10 Apr 23 This update improves scientific consistency and chart readability:

- RHR chart redesign: baseline band (P25-P75), dynamic y-axis, clearer legend, plus markers for above/below baseline band and outliers.
- More robust readiness/recovery scoring based on personal baselines:
readiness is a relative 0-100 signal (around 50 = baseline), recovery ratio is centered around 1.0.
- Better baseline quality handling: mindful-aware baseline selection and neutral fallback when history is too sparse.
- AI feedback prompts were tightened to be clearer, data-bound, and evidence-aware. 2.9 Mar 8 This update improves scientific consistency and chart readability:

- RHR chart redesign: baseline band (P25-P75), dynamic y-axis, clearer legend, plus markers for above/below baseline band and outliers.
- More robust readiness/recovery scoring based on personal baselines:
readiness is a relative 0-100 signal (around 50 = baseline), recovery ratio is centered around 1.0.
- Better baseline quality handling: mindful-aware baseline selection and neutral fallback when history is too sparse.
- AI feedback prompts were tightened to be clearer, data-bound, and evidence-aware. 2.8.2 Feb 23 Coach feedback now follows your device language, so everything stays consistent when you're set to English. 2.8.1 Jan 22 even better charts
Show distribution donuts on widgets and hero headers to better understand your HRV values. 2.8 Jan 8 even better charts 2.7 11/20/2025 even better charts 2.6 08/21/2025 Bug Fixes 2.5 06/04/2025 HRV and RHR values will now also be refreshed on the Apple Watch, ensuring up-to-date data at all times. 2.4 02/26/2025 • Improved Metrics Calculation:
Switched from median to average values for more accurate and reliable recovery and readiness assessments.
• Enhanced Background Updates:
Fixed an issue with background updates to ensure seamless synchronization and timely data refresh. 2.3 01/15/2025 Thanks for using my app.
- add complications for watch os again 2.2 11/26/2024 Thanks for using my app.
- added charts on watch os 2.1 11/26/2024 We’ve completely redesigned the app to focus on your HRV, Resting Heart Rate (RHR), Readiness Score, and Recovery Ratio! Track these key metrics effortlessly with our improved interface, optimized for actionable insights and a seamless experience. 2.0 11/16/2024 - Support new Complications and Widgets
- Bugfix 1.3 10/01/2022 - Support new Complications for Watch 4
- new Interface for iPhone
- Bug fix 1.2 01/18/2019 - Support new Complications for Watch 4
- new Interface for iPhone 1.1 01/11/2019 1.0 05/01/2018