FediDB tracks server software across the Fediverse. They track activity and overall ‘market share,’ which I think is what you’re looking for.

They’re also tracking the Threadiverse specifically.

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who the kbin software attracts

Currently, it’s an uneven split between fledditors and tech nerds, which I would chalk up to mastodon/fedi in general brimming with mostly nerds, and kbin specifically being a platform in its infancy that would naturally attract more curious devs than shitposters.

I think it’ll balance out more over time, as people who have made their home here make it the home they’re looking for. I’m hoping kbin will always keep the air of kind hyper-inquisitiveness that it currently carries.