It has a few nice features:
* font size normalization so comparing fonts is easier
* uses a command of your choice. I'm using #neovim above with a built-in #rakulang sample
* automatically uses system fonts, optionally pulls in other fonts

Implementing it is the same story as everything else in RelayTerm: #rakulang makes it straightforward to use the C libraries of #vte and #gtk4, and it's easier for everything else (array manipulation and CLI argument handling are two that come to mind)

@avuserow just when I thought about changing my Jetbrains Mono... I really need one of these for my own so badly

EDIT: upon further search, I ran into this:

https://mjtsai.com/blog/2025/01/07/coding-font-selection-tournament/