Circling back around to this after a mention by Tim Bushell at Dan Allosso's Book Club this morning. Nicole van der Hoeven has been using it for a while now and has several videos.

Though called Napkin, which conjures the idea of (wastebook) notes scribbled on a napkin, is a card-based UI which has both manual and AI generated tags in a constellation-like UI. It allows creating "stacks" of notes which are savable and archivable in an outline-esque form (though the outline doesn't appear collapsible) as a means of composition.

It's got a lot of web clipper tooling for saving and some dovetails for bringing in material from Readwise, but doesn't have great data export (JSON, CSV) at the moment. (Not great here means that one probably needs to do some reasonably heavy lifting to do the back and forth with other tools and may require programming skills.)

At present, it looks like just another tool in the space but could be richer with better data dovetailing with other services.