The Vitalmonitor Nano is our current HRV measuring device. It's small, light, accurate and works with iOS and Android smartphones and tablets.

The Vitalmonitor Flow HRV was sold until 2021. Compared to the current Nano, it is heavier, less accurate and does not have a built-in battery.

The Vitalmonitor Pro was sold until 2020. Compared to the current Nano, it is heavier and cannot be used as a heart rate monitor for sports.