The main difference between Dark Olive Green and Olive Green is brightness and saturation: both are yellow-green shades, but Olive Green is lighter and Olive Green is more saturated. Dark Olive Green (#556B2F) has an HSL of 82°, 39%, 30%, whereas Olive Green (#6B8E23) sits at 80°, 60%, 35%.
Four real design scenarios, with the recommended pick based on hue, saturation, and WCAG contrast.
Olive Green is more saturated (60% HSL vs 39%) so it reads as bolder and more memorable at logo scale, while Dark Olive Green can feel washed out when printed small.
Dark Olive Green hits a 5.95:1 WCAG contrast against white — safer for text-heavy interfaces — where Olive Green only reaches 3.81:1 and risks failing AA at small body sizes.
Olive Green is a cool-leaning tone that flatters spring/summer collections and warmer skin undertones, while Dark Olive Green leans cooler and is better suited to autumn/winter layering.
Dark Olive Green is the more muted of the two (39% saturation) and sits more calmly on large wall surfaces, while Olive Green's higher chroma can overwhelm a room when used beyond accent pieces.
Dark Olive Green (#556B2F) is a dark, muted yellow-green with a cool-leaning undertone — it feels rich, serious, substantial and subdued, sophisticated.
Olive Green (#6B8E23) is a dark, moderately saturated yellow-green with a cool-leaning undertone — it feels rich, serious, substantial and balanced in intensity.
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.