The main difference between Grape and Amethyst is brightness and saturation: both are purple shades, but Amethyst is lighter and Grape is more saturated. Grape and Amethyst are often confused but have distinct differences in hue, saturation, and tone. Grape (#6F2DA8) and Amethyst (#9966CC) 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.
Grape is more saturated (58% HSL vs 50%) so it reads as bolder and more memorable at logo scale, while Amethyst can feel washed out when printed small.
Grape hits a 8.03:1 WCAG contrast against white — safer for text-heavy interfaces — where Amethyst only reaches 4.10:1 and risks failing AA at small body sizes.
Amethyst is a warm tone that flatters spring/summer collections and warmer skin undertones, while Grape leans warmer and is better suited to autumn/winter layering.
Amethyst is the more muted of the two (50% saturation) and sits more calmly on large wall surfaces, while Grape's higher chroma can overwhelm a room when used beyond accent pieces.
Grape (#6F2DA8) is a medium, moderately saturated purple with a warm-leaning undertone — it feels balanced, versatile and balanced in intensity.
Amethyst (#9966CC) is a light, moderately saturated purple with a warm-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.