Source Sans Pro & Open Sans font pairing

Pair Source Sans Pro for headlines with Open Sans for body copy when you want clear UI hierarchy. Source Sans Pro carries display weight and brand voice; Open Sans 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: Source Sans Pro at large sizes, Open Sans for supporting sentences and CTAs.
• Product UI: keep Open Sans for forms, tables, and settings; reserve Source Sans Pro for page titles and empty states.
• Portfolios: use the contrast between Source Sans Pro and Open Sans to separate case-study titles from captions.