Sketch

Sketch is a highly influential, legendary, and historically monumental design platform that fundamentally invented the modern UI/UX design category. Prior to 2010, web designers were forced to use Adobe Photoshop (a photo editing tool) to design websites, which was incredibly clunky. Sketch was built exclusively for Mac, exclusively using vectors, and explicitly for designing digital interfaces. The absolute core superpower of Sketch was its "Native macOS Performance and Symbol Architecture." Because it was written entirely in native Apple code, it ran blisteringly fast compared to Adobe's bloated cross-platform apps. It introduced "Symbols" (reusable components), allowing a designer to design a button once, copy it 50 times, and update all 50 instantly by changing the master Symbol. While Figma has aggressively overtaken Sketch by moving to the browser (multi-player), Sketch remains deeply entrenched in highly secure enterprise environments (like massive banks or Apple itself) that demand localized, native Mac software rather than trusting cloud servers. For native Mac UI designers and highly secure corporate design teams, Sketch remains a beautiful, highly optimized, and powerful standard.