This is neat

https://ismy.blue/

Is my blue your blue?

Test your color perception with this interactive test.

@jenbanim I find this mildly irritating, because turquoise is not blue *or* green. Though I will admit that if asked "is this shade of turquoise closer to green or blue" then the results are more or less sensible.
@jenbanim When I got the picture/graph at the end it is interesting that many shades I would consider "not blue" in isolation look blue on that chart, and I would in practice draw the line where turquoise becomes blue a fair bit further left. (And add a *second* line, where turquoise becomes green).