Great app I use every day

this is a terrific app from a wonderful developer. It’s been fascinating to watch as my hrv numbers trend over time and they absolutely correlate with how my body is feeling, whether I’m feeling strong and ready to rock or fighting something off and needing to rest and recover and avoid overtraining. It’s simple and accurate and works great with just the thumb on the camera and not needing the hassle of a chest strap. The developer is very responsive and answers questions quickly, and the app is constantly and actively enhanced. Highly recommended.

Conejo1961 about HRV4Training, v6.3.3