This app works a lot like nvALT (and Notational Velocity, naturally). You pop it up and start typing. Search or create a note in seconds. It has blazing fast and accurate full-text search, the ability to find related notes based on content, and very complete Markdown editing tools (complete with syntax highlighting and theme editing). The biggest difference is that it works with multiple folders and sub-folders. You pick a folder, it indexes it, and you can use it just like nvALT. But then you can open another folder, or create a new one and start editing. It allows you to create folders anywhere, maybe one on Dropbox or iCloud Drive that’s shared, one on an encrypted disk that’s private, one for work, one for home, one for every writing project. You’re not limited to tags (though you can search by and sync with macOS tags within the app), and you can sort your notes into subfolders as well.
I’M SO EXCITED ABOUT THIS. My main request for nvAlt was always the ability to save to different folders.
Also, nvUltra is a great name. He should keep it.