Inter in action on wattenberger.com

.header-1 { font-family: Inter, sans-serif; font-size: 100.08px; font-style: normal; font-weight: 900; letter-spacing: -0.252px; line-height: 90.072px; text-transform: none; color: #292E31; }
.content-1 { font-family: Inter, sans-serif; font-size: 18px; font-style: normal; font-weight: 400; letter-spacing: -0.252px; line-height: 32.4px; text-transform: none; color: #292E31; }
.content-2 { font-family: Inter, sans-serif; font-size: 21.6px; font-style: normal; font-weight: 400; letter-spacing: -0.252px; line-height: 34.56px; text-transform: none; color: #292E31; }
Inter is available from Font Squirrel and Google Web Fonts.
Found by @mikesten on 10 Feb 2022.

Liked by:
@mikesten @Joshua_D_

Inter