None of those are cycling computers. They are applications that can, in some situations, replace cycling computers. Hardware cycling computers, like the Garmin

None of those are cycling computers. They are applications that can, in some situations, replace cycling computers. Hardware cycling computers, like the Garmin 830 or Wahoo Elemnt Roam, are physical hardware designed for the use case of being strapped to handlebars and being used in a wide range of environments. The battery life and performance is tuned towards always on GPS and Bluetooth for connecting to sensors. They utilize a wider range of GNSS constellations. They have physical buttons as touchscreens don't work well when wet. The screens are designed to be visible in sunlight. Like the GP, I'm not aware of any open hardware cycling computers.