The main difference between Medium Aquamarine and Seafoam is brightness and saturation: both are teal shades, but Seafoam is lighter and Seafoam is more saturated. Medium Aquamarine (#66CDAA) has an HSL of 160°, 51%, 60%, whereas Seafoam (#93E9BE) sits at 150°, 66%, 75%.
Four real design scenarios, with the recommended pick based on hue, saturation, and WCAG contrast.
Seafoam is more saturated (66% HSL vs 51%) so it reads as bolder and more memorable at logo scale, while Medium Aquamarine can feel washed out when printed small.
Medium Aquamarine hits a 1.93:1 WCAG contrast against white — safer for text-heavy interfaces — where Seafoam only reaches 1.43:1 and risks failing AA at small body sizes.
Seafoam is a cool-leaning tone that flatters spring/summer collections and warmer skin undertones, while Medium Aquamarine leans cooler and is better suited to autumn/winter layering.
Medium Aquamarine is the more muted of the two (51% saturation) and sits more calmly on large wall surfaces, while Seafoam's higher chroma can overwhelm a room when used beyond accent pieces.
Medium Aquamarine (#66CDAA) is a light, moderately saturated teal with a cool-leaning undertone — it feels airy, soft, approachable and balanced in intensity.
Seafoam (#93E9BE) is a light, moderately saturated teal with a cool-leaning undertone — it feels airy, soft, approachable 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.