Calckey is based off of Misskey, a powerful microblogging server on ActivityPub with features such as emoji reactions, a customizable web UI, rich chatting, and much more!
FoundKey Alternatives
FoundKey is described as 'Free and open source microblogging server compatible with ActivityPub. It is currently under LIMITED MAINTENANCE and is not well suited for large instances. No more than 20 users per instance are recommended' and is an app in the social & communications category. There are more than 25 alternatives to FoundKey for a variety of platforms, including Web-based, Self-Hosted, Android, iPhone and Android Tablet apps. The best FoundKey alternative is Mastodon, which is both free and Open Source. Other great apps like FoundKey are Bluesky, X, diaspora* and Tumblr.
