Like Mastodon is a social network on the Fediverse, as is Pixelfed and Misskey, Calckey is also such a social network in its own right. Like the others it is also interconnected by ActivityPub to everything else on the Fediverse. What probably sets it apart though is its much nicer looking user interface, post editing, customisable web UI, and rich chatting, and MFM (Misskey Flavoured Markdown) text formatting.
But they say they don’t just want to be another client, they also want to provide the tools to build online communities, without undermining them in favour of the wider network.
Calckey’s development started in 2022 originally as a soft fork of Misskey. They then added their own unique features, like account migration, a new layout to view posts, and browse threads. It can be easily self-hosted too in a Docker container.
Something unique with migrating to Calckey, is that they were busy testing out importing posts from Mastodon in May 2023, which means that if you’re migrating your Mastodon account to Calckey, you can take your posts with you.
Yes, the name is not ideal but supposedly there is talk about changing that.