Why isn’t it so popular compared to mastodon? I just found out about it and it looks pretty mature imo, it’s only popular with japanese people.
You should take a look at calckey https://codeberg.org/calckey/calckey
Misskey/Calckey look really interesting. The main reason I haven’t (yet) switched over from Mastodon is the worse support from third-party apps.
Third party apps can change the interface/appearance of Mastodon, so what advantages do Misskey/Clackey have over Mastodon?
I think language was probably a major barrier in the earlier days of the project. That, and they also kind of took their own approach to implementing ActivityPub. To my knowledge, they still don’t really have any implementation of the Mastodon API, so client support is pretty limited compared to other fedi microblogging platforms.
It just doesn’t seem very aimed at Westerners. There is a mature fork gaining prominence that is called Calckey… at least, for the next 5 days, until it rebrands. I suggest you check it out.