Signal is the non-profit encrypted messenger whose visual identity distills its mission into a single color: a specific cobalt-blue that says "we are not Facebook, we are not Telegram, we are a public-interest tool." The brand is calm editorial white space, the speech-bubble logomark, Inter type at generous sizes, and an essay-driven voice shaped by president Meredith Whittaker's policy writing.

This design system captures that restrained confidence — clean white pages, cobalt-blue calls to action, cool-grey card surfaces, and a typographic hierarchy that reads like a well-edited magazine built by cryptographers.