mochi

I tried a lot, but Toot! is the best of the bunch.

Artemis is supposed to support kbin and Lemmy. If it doesn’t support Lemmy right away, then it wouldn’t help to register on a Lemmy instance, because Artemis still wouldn’t support Lemmy.

You’re right that you can’t sign into a Lemmy instance with your kbin credentials. Each site is it’s own site. If something is posted on lemmy.world, it sends a notice to kbin.social and kbin.social fetches the info and publishes it locally on kbin as well. Comments on the kbin post are sent back to lemmy.world. There’s basically a copy of the post and comments on every server. Not every server will “know” about every other server though, so content could push across the entire federated network slowly sometimes.