Open Sans & Source Sans Pro font pairing

Pair Open Sans for headlines with Source Sans Pro for body copy when you want clear UI hierarchy. Open Sans carries display weight and brand voice; Source Sans Pro keeps paragraphs and helper text readable at smaller sizes. Download both from Google Fonts and test at 16–18px body with a bold or medium heading scale.

• Landing heroes: Open Sans at large sizes, Source Sans Pro for supporting sentences and CTAs.
• Product UI: keep Source Sans Pro for forms, tables, and settings; reserve Open Sans for page titles and empty states.
• Portfolios: use the contrast between Open Sans and Source Sans Pro to separate case-study titles from captions.