Buildkite has introduced visual changes to unify its user experience across all parts of the product. These updates include a more familiar navigation pattern in Test Analytics, an updated global nav, and a new visual style for the sidebar. The introduction of purple as a brand color helps users identify their location within the app while also improving accessibility. Additionally, Buildkite has standardized its UI with consistent icons using Heroicons by Tailwind team. These changes set the foundation for future cross-product work and improvements like dark mode.