Obsidian with Syncthing running on both your Android and your server for syncing your notes.

Joplin will do this for you. It comes ready to sync with all sorts of cloud options, as well as "local folder" which works well with Syncthing. It's offline-first, cross-platform, and FOSS.

https://v2.silverbullet.md/

This along with a home VPN and you can hit it from anywhere.

I suggest looking into using or hosting Notesnook

Mobile app is great. Desktop and web clients are great. End to end encrypted.

Self hosting docs I am unsure of. But it exists.

I use joplin with syncthing.

If privacy is important for you, https://anytype.io/ has E2EE (End-to-End Encryption). You can run your sync nodes also. Personally, I've used Roam Research, Doom Emacs, moved to Logseq, then Obsidian, back to Logseq and now I'm using Anytype for two years.

Edit (hit post by mistake): The encryption part was not a must for me also, but then I started using my notes in my work laptop also and I didn't want my notes stored in plain text on a computer which is not fully controlled by me. I'm mentioning it because over time you'll have many, many notes and the transition from one tool to the other is very time consuming.

For this scenario, I can recommend Standard Notes and/or Notesnook. I've tried Joplin and Logseq and didn't like either.

I have Joplin with Nextcloud sync. It works fine for me! It’s got a desktop app and a mobile app with, in my opinion, pretty good UI. Markdown support, syncing between devices, etc. are all there. You don’t need to connect to the network to view notes, a local copy is saved.

Org-mode and git push works for me.

Look at Notesnook. You can even self-host the server, though it’s somewhat more complicated than it needs to be.

Quillpad forever ❤️

I know this is said a lot, but nextcloud does all that.

As an added benefit the files are just in a directory that you could edit if needed

Obsidian aldo has (paid, subscription) native sync that is supposed to work better than file sync. Another alternative is git sync. That's basically file sync through git but great if you want to track your changes.

I am using SiYuan and I use the web app as a short cut, so that I can easily create notes on my phone.

I use the Quillpad app and sync it with Nextcloud notes. Been pretty flawless so far.

I have joplin but personally found myself using Nextcloud Notes 100% of the time. I just need very basic, quick markdown notes

Ticks all your boxes

Take a look at Affine. I am using Joplin currently, however I am leaning more and more towards Affine due to OIDC support