> No, it's used everywhere in phonology, for every language.
Sure, of course, but I was thinking mostly of those grammars (usually Sino-Tibetan ones, for some reason) which use IPA throughout instead of a romanisation. (I suppose that by now I’m just so used to IPA being used for phonologies that I don’t even think about it.)
> I started a project like that (also to train myself using web components), except it listed the phonemes of a given language, selectable to the user. I should complete it one day...
So like PHOIBLE? (https://phoible.org/)