About Sea of Tranquillity
Sea of Tranquillity (#81d1da) reads as a softly saturated cyan in cyan territory, mid-toned in value. In color psychology it reads as clinical, futuristic, and clean — a pastel presence and a cool cast, and it carries the steadiness designers lean on for trust-centered brands.
For text on Sea of Tranquillity, black performs best at 12.07:1 — passing WCAG AAA. In a palette it suits accent roles.
Contrast Accessibility
With white
1.74:1
With black
12.07:1
Color Conversions
#81d1da
rgb(129, 209, 218)
hsl(186°, 55%, 68%)
oklch(0.812 0.079 204.9)
cmyk(4100%, 400%, 0%, 1500%)
Tint & Shade Scale
A 10-step scale from light to dark, anchored to the base color at step 500. Click any swatch to copy its hex.
Tone Scale
Color mixed with gray — reduces saturation without changing lightness. Click any swatch to copy its hex.
Temperature
Hue shifted cooler and warmer in equal steps. Click any swatch to copy its hex.
Color Psychology
Adds: gentleness, airiness, approachability, openness · Reduces: intensity, authority, formality
Palette Narrative
A oceanic palette evoking airy, balanced, clean. Well-suited for approachable and high_tech brand contexts. A focused selection that communicates intent clearly.
Inspired Palettes
Shades
Lightness variations keeping hue and chroma intact
Monochromatic
Single hue with varied lightness and chroma
Complementary
Opposite hues on the color wheel for maximum contrast
Triadic
Three evenly spaced hues for vibrant balance
Analogous
Neighboring hues for natural, serene combinations
Split Complementary
Complement split into two flanking hues
Generic Gradient
Smooth lightness ramp from dark to light
Matching Gradient
Lightness ramp with a gentle hue drift
Skip Gradient
Alternating light and dark steps for rhythm
9 of 28 palettes from #81d1da
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