Before you export your design, do the "Squint Test." Squint your eyes at the screen until everything blurs. Do you see a muddy grey mess? Or do you see distinct shapes?

A tetradic scheme fails when it attempts to be democratic. It succeeds only when it submits to a hierarchy. You cannot have four kings on one throne.

This is the classic version. You pick two colors that are adjacent on the wheel (like red and orange-red) and then jump to their opposites. This creates a balanced mix of warm and cool tones.

It inherently includes a mix of warm and cool tones, providing high contrast and visual energy. Review: Pros and Cons

If all four are fighting for attention, the user’s eye will bounce around the screen like a pinball machine, and they will leave.

The tetradic scheme is not for the timid. It is the scheme of the maximalist, the storyteller, the complex thinker.