I used to use Ulysses. It's a great app, but shortly after I paid $40 for it, they switched to subscription. I'm now looking for a new app.
I use Mac for work (with the old no longer updated Ulysses)
Linux at home (using caret)
And an Android phone (JotterPad).
I sync between them using Dropbox.
Once Ulysses stops working on a future MacOS update, I'll likely switch to caret there as well. It's relatively easy to get a really nice, supported polished Mac app. Working in a cross platform world is tough. I'd love to be able to replace Ulysses and caret with a native Markdown editor like this. I'll check it out.
I have less problems with the subscriptions, but with their proprietary file format. All I want to do is edit text files and maybe convert them to blog posts. It's impossible, since Ulysses doesn't seem to support batch exporting multiple files to Markdown.
For pure writing, I use iA Writer, but its library/organizational features are lacking.
Since I have no Apple hardware except for a work provided laptop, I don't use Ulysses' proprietary format. I just have a folder (that's in Dropbox) with straight .md files in it, and have added it to ulysses. After the Evernote mess, I don't want anything in a proprietary format.
Plus, since I'm cross platform, with different apps on each platform, I don't have a choice.
You can use Ulysses in the proprietary format or open regular .md files. I have a folder open, so I have multiple layers of folders. It works pretty well.
The proprietary is required for iCloud (if you want to share notes with the iOS app).
VNote is great for managing and editing plaintext md files. All data is plaintext and you could even use any editor to edit your notes even after VNote is obsolete someday.