The 8pt and 4pt grid systems are essential in app design for creating consistent, scalable, and flexible layouts across devices. These grids ensure even spacing for elements like buttons and margins, resulting in clean, harmonious designs. Their scalability allows designs to maintain integrity across different screen sizes, while simplifying layout decisions for efficiency. Additionally, these systems foster better collaboration between designers and developers by standardizing unit systems. They also promote modular design, making it easier to reuse components and maintain consistency throughout the app.

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