Flat Design rejects skeuomorphism's textures and shadows in favor of 2D, minimalist aesthetics. Uses solid colors, simple shapes, clean typography, no gradients or depth cues. Popularized by Windows Metro and iOS 7. Evolved into "Flat 2.0" with subtle shadows.
Use flat design for modern web apps, mobile apps, dashboards, or any interface prioritizing content over decoration. Works well for B2C products, especially when paired with bold brand colors. Great for responsive design (scales easily).
Aesthetic Design
No depth, no gradients, solid colors, simple shapes—anti-skeuomorphic