The main difference between Fern and Sage is hue — Fern is a cool-leaning green, while Sage is a cool-leaning yellow-green. Fern and Sage are often confused but have distinct differences in hue, saturation, and tone. Fern (#4F7942) and Sage (#9CAF88) 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.
Fern is more saturated (29% HSL vs 20%) so it reads as bolder and more memorable at logo scale, while Sage can feel washed out when printed small.
Fern hits a 5.07:1 WCAG contrast against white — safer for text-heavy interfaces — where Sage only reaches 2.36:1 and risks failing AA at small body sizes.
Sage is a cool-leaning tone that flatters spring/summer collections and warmer skin undertones, while Fern leans cooler and is better suited to autumn/winter layering.
Sage is the more muted of the two (20% saturation) and sits more calmly on large wall surfaces, while Fern's higher chroma can overwhelm a room when used beyond accent pieces.
Fern (#4F7942) is a dark, muted green with a cool-leaning undertone — it feels rich, serious, substantial and subdued, sophisticated.
Sage (#9CAF88) is a light, muted yellow-green with a cool-leaning undertone — it feels airy, soft, approachable and subdued, sophisticated.
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.