I've just discovered the amazing Skein Notes, a free app programmed by Tomasz in Brighton (UK). Skein Notes and his pure markdown editor Lede can be downloaded from the Mac App Store, but so can a couple of paying apps, Verso and Nought, that can edit .docx and .xlsx files respectively – without disrupting them.

Skein Notes and Lede are aesthetically gorgeous (IMHO) and appear to work really well. I haven't experimented with Nought and Verso yet, but if they're up to the same standard, they're something of a bargain.

Lede appears to be the markdown editor from Skein Notes separated out and offered on its own. Good call – it's a lovely editor, and on Mac at least a good alternative to Typora.

The various websites are at:
- Skein Notes: https://www.skeinnotes.app
- Lede: https://www.skeinnotes.app/lede
- Verso: https://www.versowriter.app
- https://www.nought.app