The main difference between Gunmetal and Black is hue — Gunmetal is a cool blue, while Black is a neutral near-black. Gunmetal (#2A3439) is a very dark blue-gray with a metallic cool undertone, while Black (#000000) is absolute absence of light. Gunmetal shows subtle blue hue in light; true black shows none.
Four real design scenarios, with the recommended pick based on hue, saturation, and WCAG contrast.
Gunmetal is more saturated (15% HSL vs 0%) so it reads as bolder and more memorable at logo scale, while Black can feel washed out when printed small.
Black hits a 21.00:1 WCAG contrast against white — safer for text-heavy interfaces — where Gunmetal only reaches 12.74:1 and risks failing AA at small body sizes.
Gunmetal is a cool-leaning tone that flatters spring/summer collections and warmer skin undertones, while Black leans cooler and is better suited to autumn/winter layering.
Black is the more muted of the two (0% saturation) and sits more calmly on large wall surfaces, while Gunmetal's higher chroma can overwhelm a room when used beyond accent pieces.
Gunmetal (RGB 42,52,57) is a near-black blue-gray at L=19% with a cool metallic undertone, named after the dark patina of gunmetal steel alloy.
Black (RGB 0,0,0) is the absolute absence of light — zero lightness, zero saturation. The default inkwell color of all design.
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.