Proxima Nova in action on landerapp.com

.header-1 { font-family: proxima-nova, sans-serif; font-size: 28px; font-style: normal; font-weight: 300; letter-spacing: normal; line-height: 39.2000007629395px; text-transform: none; color: #FFFFFF; }
.header-2 { font-family: proxima-nova, sans-serif; font-size: 86.3999938964844px; font-style: normal; font-weight: 600; letter-spacing: -4.31999969482422px; line-height: 69.1199951171875px; text-transform: uppercase; color: #FFFFFF; }
.header-3 { font-family: proxima-nova, sans-serif; font-size: 21.5999984741211px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: 30.2399978637695px; text-transform: none; color: #333333; }
.header-4 { font-family: proxima-nova, sans-serif; font-size: 15.039999961853px; font-style: italic; font-weight: 300; letter-spacing: normal; line-height: 48.9599990844727px; text-transform: none; color: #FFFFFF; }
Proxima Nova is available from Fontdeck, Fonts.com, Fontshop, Fontspring, MyFonts, Typekit and YouWorkForThem.
Found by @mikesten on 15 Apr 2015.

Liked by:
@mikesten @boyax2154 @MatiasFMolinari @karatziotis @franck_koty

Proxima Nova