Before I used Apple Notes, but the search became really slow after adding too many notes. Then I used VSCode with Markdown and that worked for a couple years, but there was no streamlined way to share notes and I realized often times I would have a note that could be categorized under multiple files.

To solve this I made Mindapp. It has a tagging system that allows tags to be subsets of other tags so for example the "San Francisco" tag is a subset of the "Bay Area" and "City" tags - both of which branch out into their own subtags. It also has different spaces that you can store notes in so they can be public or private. Another cool feature is it uses public/private keys to publish under different personas and verify posts.

A demo of how I use it can be found at https://www.linkedin.com/feed/update/urn:li:activity:7263871...

and the source code at https://github.com/mileung/mindapp

I made it for my own needs first but I think it would be cool if I had other users. The main problem is in order to get all the features, the setup process requires the command line and I don't have the bandwidth to streamline that process atm.

Lastly, if you'd like to see more improvements to Mindapp, I submitted it to a hackathon and would appreciate it if you voted for it at https://hack.solidjs.com/submissions

Let me know if you have any questions!