I'm working on a notes taking service [0] that behaves the way I want. All notes are organized in the (potentially nested) streams, messages can also have metadata attached which makes it easy and natural to keep track of any observations, be it travel notes, reading notes or exercises tracking. The big idea is to make it a place that would accommodate for any types of notes and any steaming messages in general, e.g. data from your smart home weather station.

Public streams have RSS, you can follow my dev and product streams if you like.

Landing page is rubbish, api is not there, but I hope it's good enough to present the idea. I've recorded a video [1] to showcase the features

[0]: https://dabdab.org [1]: https://www.youtube.com/watch?v=GJURq8PH_d4