Let's start with what color psychology is not: it's not "make your CTA red because red means urgency." That oversimplification has launched a thousand bad blog posts. The actual research (Labrecque & Milne, 2012) shows that color associations are heavily context-dependent, culturally variable, and subordinate to personal experience.
What does matter for landing pages is contrast, not specific hue. The famous HubSpot red-vs-green button test? The red button won not because of urgency psychology but because the page was predominantly green — the red button stood out. A green button on a red page would likely have won instead.
Where color actually moves the needle
Three color decisions that genuinely impact conversions: (1) CTA contrast — your primary button must be the most visually distinct element on the page, regardless of its specific color, (2) Brand consistency — mismatched colors between your ads and landing page trigger subconscious distrust, (3) Readability — insufficient text-to-background contrast ratio kills engagement faster than any "wrong" color choice.
Stop A/B testing orange vs. blue buttons. Instead, test whether your CTA has enough contrast against its surrounding content, whether your color palette communicates the right brand personality (fintech probably shouldn't be neon pink), and whether your text meets WCAG contrast standards. Those are the color decisions that actually matter.