The 100-Day UI Challenge is a structured self-improvement project aimed at enhancing user interface design skills through consistent, daily practice. Over the course of 100 days, participants create a new UI element or concept each day—such as a login screen, a dashboard widget, a mobile navigation drawer, or an interactive prototype component—while exploring different design principles, tools, and workflows. By maintaining this steady cadence, designers not only expand their personal portfolios and refine their technical craftsmanship, but also develop stronger habits, greater creativity, and a deeper understanding of how design decisions impact user experience.