Comment by Lalabadie
6 hours ago
iA Writer has Mono, Duo and Quattro fonts, with the latter two being almost monospaced. They concede some size variations for specific characters (Duo has 150% width characters, Quattro also uses 50% and 75% for narrow characters).
It's a fun subtle adaptation to keep close to the typewriter-like experience of the app.
Duo is perfect middle ground between monospace and proportional sans, in my opinion at least. There's also Trispace[1].
https://etceteratype.co/pages/trispace