Strava

It's not possible to get mixed units correct.

The best they could do is for each mode of sport, offer the ability to use metric or imperial below a certain threshold, and metric or imperial above a threshold.

i.e. when I'm riding and it's less than 100km use metric, otherwise use imperial.

Which sounds crazy, but is actually how most people want it.

When I'm driving I visualise metres better than miles for upcoming turns, etc (i.e. less than 2 miles), but then prefer miles above that because it matches road signage.

Distance is distance and that doesn't change, but how it's displayed and communicated is preference and the US employees who makes these apps are detached from European mixed unit madness that crosses generational divides.

Let alone the internationalisation of routing software (my Navdy loves telling me to stay on the "right of a circle" to turn left, and I mentally have to convert this into, "it's a roundabout, just turn left").

The whole thing is an internationalisation thing, as US staff over-simplify things into "this country is wholly metric or imperial"... whereas actually, people pick and choose what works for them for a given purpose.