Blender with Graphik in action on about.modeanalytics.com

Under the hood

.header-1 { font-family: Blender, "Helvetica Neue", Helvetica, Arial, sans-serif; font-size: 48px; font-style: normal; font-weight: 500; letter-spacing: normal; line-height: 57px; text-transform: none; color: #393945; }
.content-1 { font-family: "Graphik Web", "Helvetica Neue", Helvetica, Arial, sans-serif; font-size: 21px; font-style: normal; font-weight: 400; letter-spacing: normal; line-height: 31px; text-transform: none; color: #393945; }

Blender is available from Fonts.com.