The main difference between Aqua and Turquoise is hue — Aqua is a cool cyan, while Turquoise is a cool-leaning teal. Aqua (#00FFFF) and Turquoise (#40E0D0) are similar colors often confused. They differ in brightness, saturation, and undertone, making each better suited for different design contexts.
Four real design scenarios, with the recommended pick based on hue, saturation, and WCAG contrast.
Aqua is more saturated (100% HSL vs 72%) so it reads as bolder and more memorable at logo scale, while Turquoise can feel washed out when printed small.
Turquoise hits a 1.64:1 WCAG contrast against white — safer for text-heavy interfaces — where Aqua only reaches 1.25:1 and risks failing AA at small body sizes.
Turquoise is a cool-leaning tone that flatters spring/summer collections and warmer skin undertones, while Aqua leans cooler and is better suited to autumn/winter layering.
Turquoise is the more muted of the two (72% saturation) and sits more calmly on large wall surfaces, while Aqua's higher chroma can overwhelm a room when used beyond accent pieces.
Aqua (#00FFFF) is a medium, vivid cyan with a cool undertone — it feels balanced, versatile and bright, energetic, eye-catching.
Turquoise (#40E0D0) is a medium, vivid teal 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.
Each color has a dedicated page with shades, tints, CSS name, pairings, and color psychology.