Open Sans in action on getfiltrapp.com

.header-1 { font-family: "Open Sans", sans-serif; font-size: 40px; font-style: normal; font-weight: 300; letter-spacing: normal; line-height: 57.1429px; text-transform: none; color: #9F65EA; }
.header-2 { font-family: "Open Sans", sans-serif; font-size: 20px; font-style: normal; font-weight: normal; letter-spacing: 4px; line-height: 28.5714px; text-transform: uppercase; color: #9F65EA; }
.content-1 { font-family: "Open Sans", sans-serif; font-size: 15px; font-style: normal; font-weight: 300; letter-spacing: normal; line-height: 25px; text-transform: none; color: #777777; }
Open Sans is available from Font Squirrel, Google Web Fonts, MyFonts and Typekit.

Try this combination out in Pair and Compare.
Found by @mikesten on 10 Dec 2016.

Liked by:
@mikesten

Open Sans