I used to use nvALT extensively, and I waited and waited for nvUltra to come out of beta, but it's been Coming Real Soon Now for more than 5 years, and I don't even use macOS as my primary OS anymore.
Fortunately, we are spoiled for high quality note taking and knowledge management apps these days, and many of those either support markdown syntax in writing (e.g. Outline, Trilium) or are directly markdown based (Obsidian).
Fortunately, we are spoiled for high quality note taking and knowledge management apps these days, and many of those either support markdown syntax in writing (e.g. Outline, Trilium) or are directly markdown based (Obsidian).