The main difference between Viridian and Kelly Green is hue — Viridian is a cool-leaning teal, while Kelly Green is a cool-leaning green. Viridian and Kelly Green are often confused but have distinct differences in hue, saturation, and tone. Viridian (#40826D) and Kelly Green (#4CBB17) each suit different design contexts — understanding their differences helps you choose the right color for your project.
Four real design scenarios, with the recommended pick based on hue, saturation, and WCAG contrast.
Kelly Green is more saturated (78% HSL vs 34%) so it reads as bolder and more memorable at logo scale, while Viridian can feel washed out when printed small.
Viridian hits a 4.53:1 WCAG contrast against white — safer for text-heavy interfaces — where Kelly Green only reaches 2.49:1 and risks failing AA at small body sizes.
Kelly Green is a cool-leaning tone that flatters spring/summer collections and warmer skin undertones, while Viridian leans cooler and is better suited to autumn/winter layering.
Viridian is the more muted of the two (34% saturation) and sits more calmly on large wall surfaces, while Kelly Green's higher chroma can overwhelm a room when used beyond accent pieces.
Viridian (#40826D) is a dark, muted teal with a cool-leaning undertone — it feels rich, serious, substantial and subdued, sophisticated.
Kelly Green (#4CBB17) is a medium, vivid green with a cool-leaning undertone — it feels balanced, versatile and bright, energetic, eye-catching.
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.