A walkthrough of a free UI design quiz tool that tests your ability to spot common design mistakes. The tool presents real UI examples and asks you to identify which of six fundamentals — white space, contrast, color, typography, scale, and alignment — are incorrectly applied. Each correct answer updates the design in real time so you can see the improvement. The tool includes 15–20 exercises with a scoring system, and the author argues that being able to identify bad design is a critical skill, especially as developers increasingly rely on AI-generated UIs.
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