How can I use just system fonts for my website?

That font can't be added using that filter unfortunately - you'll need to wait until the next GPP version, or just use CSS.

Thanks Tom,
I'm happy that you are including this in your next upgrade.
I'm sure that others will come to appreciate access to system fonts too.

I agree - the system stack will actually be the new default font in GP 2.0 :)

I have taken your advice and implemented the fonts in CSS on both, the Little Composers as well as the Learn Note Names website. It was easy since I am already using your Simple CSS plugin.
Here is what did the magic:

body {font-family: -apple-system, BlinkMacSystemFont,
"Segoe UI", Roboto, Helvetica, Arial, sans-serif,
"Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";}

This is a good solution until you release GP 2.0,

Perfect :)

Hey Tom I see you added system fonts, which is great! But....does this mean that no google fonts are loaded and no other font bloat is loaded when choosing this option? Like I don't have to filter in and turn it off?

Thanks!

That's right - if you choose the System Stack option, no Google Fonts will be loaded (unless you choose them elsewhere) :)

#awesome thanks!

No problem! :)