Noto Sans with Roboto in action on ada.com

.header-1 { font-family: Roboto, sans-serif; font-size: 52px; font-style: normal; font-weight: 100; letter-spacing: 3.12px; line-height: 57.2px; text-transform: none; color: #FFFFFF; }
.content-1 { font-family: "Noto Sans", sans-serif; font-size: 18px; font-style: normal; font-weight: normal; letter-spacing: 0.18px; line-height: 27px; text-transform: none; color: #FFFFFF; }
Noto Sans is available from Font Squirrel and Google Web Fonts.

Roboto is available from Font Squirrel, Google Web Fonts and Typekit.

Try this combination out in Pair and Compare.
Found by @mikesten on 18 Jan 2017.

Liked by:
@mikesten @olechka020 @majlind_ @celestinmeunier @tim_j_evans

Noto Sans with Roboto