i remember looking through these during a deep dive on type selection -- naturally radon, krypton, and arguably xenon come across as a bit gimmicky, argon has stiff competition in its genre as it's the rough style of most “modern” monospace faces, but neon is actually kind of spicy. this is the closest to the “mona” in “monaspace”, being similarly derived from helvetica and its ilk, and sits at just that right level of regularity that it's easy on the eyes after a long day in a way that i previously thought was only the purview of sf mono.

if argon tickles your fancy, you might also be interested in fragment mono (https://github.com/weiweihuanghuang/fragment-mono) a similar free software “helvetica mono”.

the tragedy of both argon and fragment mono, though, is that the latter comes in one width, and the former inexplicably supports obscenely wide proportions without letting you condense it down from the bog-standard 1x2ish. most condensed options out there are these pill-shaped straight-walled monstrosities that blur together (the iosevkas and pragmatas of the world), with a few notable exceptions (the old osdn releases of mplus).

i wonder what would happen if you went in and extrapolated the width scaling for monaspace backwards into super narrow range.