[bayindirh]

I was a notesnook subscriber. It was a good app riddled with some unpleasant bugs in their publish workflow, so I canceled after three months or so, sadly.

OTOH, you don't need to pay for Obsidian sync. You can sync it via any cloud provider or syncthing if you prefer.

I have a business related vault under Obsidian. It syncs via office's Nextcloud instance. I also added "Edit history" plugin, so I have unlimited diff and undo on that vault, too.