This app measures your average HRV (Heart Rate Variability) during sleeping hours. It is intended for devices without the built-in HRV Status app/widget. HRV can be used to determine training readiness, and can provide insights into recovery and stress. # Features * Configurable measurement interval * Average HRV and HR display Note: To start nightly measurements, you must run the app at least once. # FULL Version Features * 4 week history and 7 day average HRV graph # Payment For the FULL version, use this link to pay US$1.99 via Stripe (no account required; credit card, Apple Pay, Google Pay accepted). https://buy.stripe.com/28E5kE7vyb4udVl62yf3d1O Alternative payment via Paypal: https://www.paypal.com/paypalme/trudelta/1.99USD Important instructions to get your unlock code quickly: https://ko-fi.com/post/Payments-via-PayPal-Z8Z6AIK78 Payment via Stripe is recommended because you will get the unlock code immediately on the payment confirmation screen. Also sometimes with Paypal there are transaction fees depending on your country. With Stripe there are never any additional fees. If you don't get a reply within 8 hours, see here for help: https://ko-fi.com/post/Common-causes-for-not-receiving-your-unlock-code-N4N8BUEGH

Version 0.10.0 Diagnostics change only. Version 0.9.0 Correction to use the average RHR instead of user configured RHR in the algorithm. Version 0.8.0 Added a maximum heart rate (above RHR) setting to account for possibly higher than expected heart rate during sleep. Version 0.7.0 Changed layout of diagnostics info.