Interestingly Delta Chat kind of fits the bill thanks to their investigation of webxdc, i.e. mini apps that run entirely within the chat and never connect to th

Interestingly Delta Chat kind of fits the bill thanks to their investigation of webxdc, i.e. mini apps that run entirely within the chat and never connect to the outside world, only with peers in the chat: https://webxdc.org/ https://webxdc.org/ I can't say if this is the future, but I like it taking another direction. Taking a few steps back, this model solves a lot of problems with a very easy UX for beginners: shared calendar, shared expenses, shared notes can all happen inside your chat, which is naturally the place where you already share stuff with people, but now it can be more without any server installation or anything.