I’ve used Outline for 2 years. It’s honestly really nice. Pretty simple to selfhost and you can set-up internal auth with something like Authelia.
However I recently moved to Obsidian.md because of the large community and add-ons available. I love it. For device synchronisation I use Syncthing and I can’t complain. It has no WebApp but it’s available on every platform
Notes taking app
I’m looking for a good notes taking app to replace The Bad Ones like Evernote....