When I last used it -- it was pretty cool. It was a "web app" that you saved as a .html file to your computer and just opened in the browser (no back-end, no web-server, all-local). I'm not sure how much browsers have locked that down now.

It's obviously salestalk --- the tiddlywiki community imho is in fact quite modest.

it's pretty awesome and inspired new projects. nowadays i use logseq, but conceivably i could share the markdown with tiddlywiki. it's also very good that you can use private sharable tiddlywiki's on the site. great for working together on projects.

While as an Emacs-er I have obviously not much interest in it, for some aspects it's relatively revolutionary:

- it have a unique concept of transclusion, notes can have tags and calling tags allow transclusion of all matching notes in the current one, a very nice composition idea, especially since you choose between transclusion and link;

- notes are created, with a companion app saved, full-text searched with a very simple UI, better than similar small wikis like Zim;

- it's js/web nature is a turn off, but might be interesting for many since this days is an easy to share media, easy to serve locally (see for instance widdler);

- it's simple but still a bit featured, like attachment support, image rendering in-line, LaTeX math rendering etc and it's moderately easy to mold with web stuff.

Personally I consider both Tiddly Wiki and Zim wiki two best example of modern apps well done with all limits of modern apps in general compared to classic systems. All other desktop tools for notes I know are far, far, far less interesting then those.