Inter Typeface
(A bit of a love letter.) This project isn't affiliated with Inter, but since TypeGrid is so typography-focused, it wouldn't be the same without it.
TypeGrid is unabashedly influenced on "Swiss" or "International Style" design styles. Those made heavy use of sans-serif typefaces: back then they were Akzidenz-Grotesk, Univers, and then Helvetica.
In my opinion, Inter is the modern standard. Personally, I love that it's open-sourced and am continually impressed at the quality given the open-source nature.
This site uses the lates version from the creator, not the Google Fonts-hosted version, which is outdated.
Playing with variants
To customize the look and stay a bit more true to TypeGrid's Swiss roots, I'm making use of some of the awesome variations:
Lorem ipsum, “dolor” sit amet.