Since Mastodon, a prominent adopter of ActivityPub, developed its own client API, it has been embraced by various projects, even reaching beyond microblogging platforms. Despite its potential, the ActivityPub Client-to-Server API has received minimal attention, leading many platform developers to overlook it in favour of building bespoke or third-party solutions.

My talk will explore the unfulfilled promise of a general-purpose client built on ActivityPub's Client API. By developing a general-purpose client app, participating in the specification work, and addressing its shortcomings, we can initiate a new cycle of client app development. This approach will empower platform developers to innovate new services, fostering broader adoption and exploration of ActivityPub’s Federation capabilities across diverse platforms.