Proxima Nova in action on spendeeapp.com

Under the hood

.header-1 { font-family: proxima_nova, Helvetica, Arial, sans-serif; font-size: 16px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: 16px; text-transform: none; color: #323642; }
.header-2 { font-family: proxima_nova, Helvetica, Arial, sans-serif; font-size: 30px; font-style: normal; font-weight: 300; letter-spacing: normal; line-height: 36px; text-transform: none; color: #ABB0B9; }