The main difference between Espresso and Grey is hue — Espresso is a warm red, while Grey is a neutral gray. Espresso (#3C1414) has an HSL of 0°, 50%, 16%, whereas Grey (#808080) sits at 0°, 0%, 50%.
Espresso (#3C1414) is a very dark, moderately saturated red with a warm undertone — it feels deep, heavy, grounded and balanced in intensity.
Grey (#808080) is a medium, near-neutral gray with a neutral undertone — it feels balanced, versatile and desaturated and restrained.
Text legibility depends on the contrast ratio between foreground and background. WCAG 2.1 AA requires at least 4.5:1 for normal text and 3:1 for large text; AAA requires 7:1. Use these numbers to choose accessible combinations for your design.
Each color has a dedicated page with shades, tints, CSS name, pairings, and color psychology.