Heart

A heart rate monitor, merged from InfiniTime's HeartRate and wasp-os's heart app. It starts measuring as soon as it opens.

Using it

• Wear the watch snugly and keep still. The large number is the latest reading in beats per minute, or --- until there is one.
• The line below says what the sensor is doing: starting, no touch, waiting for enough data, or measuring.
• Once readings come in, a chart of the latest ones appears above the button.
• The heart at the top turns red while the sensor is on.
• Tap Stop to stop measuring, and Start to begin again. The screen stays on while it measures, and measuring stops when the app closes.
• To measure in the background, with the app closed, choose an interval under Heart rate in Settings.
• The watch keeps the average of each six minutes' readings, from the app or the background interval, in a daily log for 90 days.

Screens

Just opened, while the sensor starts: no reading yet, so the number shows dashes.

The sensor does not feel skin, so it says No touch detected.

The sensor needs more data before its first reading.

Measuring: the latest reading, 74, with a chart of the readings so far.

Stopped, after tapping Stop: the chart stays and the button reads Start.

With the companion app

• The companion syncs the heart rate log. The Heart plugin's page lists each of the last two weeks' days with its average, lowest and highest heart rate.
• While the app measures, each reading also goes to a phone app such as Gadgetbridge through the standard Bluetooth heart rate service.