I am developing iPhone apps that use ECG from a chest strap to follow heart rhythm and heart rate variability (HRV). The apps build on many years of clinical work with heart rhythm disorders and on my research into how the nervous system controls the heart.
The apps will be released on the App Store as they are completed. Stay tuned.
The apps are made for training and self-insight. They cannot be used to make a diagnosis and do not replace assessment by a doctor.