BikeOtterTry it right here
This is the actual BikeOtter app, compiled for the browser and loaded with a few routes and rides so there is something to look at. Not a video and not a mockup — the same code that runs on the phone.
It talks to a stand-in head unit, so nothing pairs and nothing is kept: reload the page and it has forgotten you were here. It is a few megabytes, which is why it lives on a page of its own rather than the front one.