Swiss Design, also known as the International Typographic Style, emerged in the 1950s with an emphasis on cleanliness, readability, and objectivity. Its hallmarks — grid-based layouts, sans-serif typography, asymmetric compositions, and the use of photography over illustration — became the visual language of modernism. This article explores how Swiss Design principles directly shaped the design of iOS, Google's Material Design, and countless SaaS interfaces. It provides practical applications of the Swiss grid system, typographic hierarchy, and whitespace management for web and app design.