Pick the body face
Headings are BlueLabs on every card. Each card sets the same consensor copy in one body candidate, on the canonical dark ground. BlueLabs has no punctuation, so every full stop, comma and apostrophe in a heading falls back to the body face beside it: look at the headings' punctuation too.
What's on this Mac and what isn't. Inter (the canonical pages today), Geist (the light Blue Labs shell pages) and DM Sans were already here, all under the SIL Open Font License. SF Pro is the system face: fine inside HABITAT, which is a Mac app, but its licence doesn't allow it as a web font on consensor.io.
If you want a face that isn't here (IBM Plex Sans, Manrope, Figtree, Instrument Sans, General Sans…), say which and I'll ask before downloading anything.