Nightfall is an elegant analog watch face. At the top there is the remaining battery, on the right the step count, at the bottom the date and on the left the heartbeat. In the settings it is possible to change the hands by choosing the semi-transparent ones and set the shortcut app positioned on the steps. The Always On Display mode is the same of the standard one.

Notes about Heart Rate detection.

The heart rate measurement is independent of the Wear OS Heart Rate application.
The value displayed on the dial updates itself every ten minutes and does not also update the Wear OS application.
During the measurement (which can also be triggered manually by pressing the HR value) the heart icon blink until the reading is completed.