The main difference between Baby Blue and Periwinkle is hue — Baby Blue is a cool cyan, while Periwinkle is a cool purple. Baby Blue (#89CFF0) is a light, friendly sky-blue, while Periwinkle (#CCCCFF) is a pale purple-blue named after the flower. Baby blue leans cyan-clean; periwinkle leans violet.
Four real design scenarios, with the recommended pick based on hue, saturation, and WCAG contrast.
Periwinkle is more saturated (100% HSL vs 77%) so it reads as bolder and more memorable at logo scale, while Baby Blue can feel washed out when printed small.
Baby Blue hits a 1.71:1 WCAG contrast against white — safer for text-heavy interfaces — where Periwinkle only reaches 1.54:1 and risks failing AA at small body sizes.
Periwinkle is a cool-leaning tone that flatters spring/summer collections and warmer skin undertones, while Baby Blue leans cooler and is better suited to autumn/winter layering.
Baby Blue is the more muted of the two (77% saturation) and sits more calmly on large wall surfaces, while Periwinkle's higher chroma can overwhelm a room when used beyond accent pieces.
Baby Blue (RGB 137,207,240) is a light clean blue at L=74% with a sky-blue character — classic nursery color since the early 20th century.
Periwinkle (RGB 204,204,255) is a pale purple-blue at L=90%, equal red and green with maxed blue. It reads as dreamy, floral, and slightly lavender.
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.