Obsidian is like the shared knowledge base that everyone has access to and that I can easily read/review (although I try not to too often). It has architecture stuff, go-to-market section, howtos (setting up new agents, dns backups, etc.), info on my main projects, writing, etc. It gets synced between my machine and the VPS. I also store in github as a backup occasionally (thx for reminder!).

I use the actual Buzz ios app which I was building on my own but at first glance it appears is now in the iOS store.