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Lucid Jupiter Lagoon

#31c4df
Notes

Lucid Jupiter Lagoon (#31C4DF) is a true cyan with a vibrant character. It holds its own as a focal accent, carrying visual weight without tipping into neon territory. Its HSL profile (189°, 73%, 53%) places it in the balanced band at a mid lightness. It works across type, buttons, and borders, saturated enough to feel deliberate but balanced enough to not fight the rest of the palette. For a confident two-color system, pair it with its complementary red. For something softer, pull in its analogous neighbors on either side of the wheel.

HEX
#31c4df
RGB
rgb(49, 196, 223)
HSL
hsl(189, 73%, 53%)
HWB
hwb(189 19% 13%)
OKLCH
oklch(75.8% 0.123 213.4)
P3
color(display-p3 0.3860 0.7578 0.8610)
HSV
hsv(189, 78%, 87%)
LAB
lab(73.19% -28.40 -24.22)
LCH
lch(73.19% 37.33 220.46)
CMYK
cmyk(78%, 12%, 0%, 13%)

Etymology

Lucid
adjective

Latin lūcidus, clear / bright — derived from lūx (light). As a color modifier, lucid implies a clear-and-readable quality where the hue is unambiguous and free of optical clutter. Sits at the crisp-and-clear end of the grid, parallel to pellucid and plain in usage.

Jupiter
modifier

Latin Iuppiter, Roman-king-of-gods-and-fifth-planet. As a color modifier, jupiter implies a Roman-king-of-gods-and-fifth-planet-and-gas-giant quality, the visual register of Roman-Jupiter-Optimus-Maximus-and-Galileo-moons hand-Roman-king-of-gods-and-fifth-planet-and-gas-giant Roman-Jupiter-Optimus-Maximus-and-Galileo-moons-and-Great-Red-Spot jupiter-and-Roman-king-of-gods surfaces under Roman-Jupiter-Optimus-Maximus-and-Galileo-moons-and-Great-Red-Spot Capitoline-Hill-and-Galilean-moon-discovery king-of-planets-light. Sits at the modifier-and-zodiac end of the grid, parallel to venus and saturn in usage.

Lagoon
noun

A shallow body of saltwater partially or fully enclosed by a barrier — coral atoll lagoons in the Pacific, Venice's Laguna Veneta, the Florida Keys' backcountry. The color refers to the average reflectance of a calm tropical lagoon at midday: a saturated, slightly muted blue-green with the optical clarity of shallow water over white sand. Brighter than reef, cooler than aquamarine, with the postcard weight of a Pacific atoll seen from above.

Closest matches

The nearest named color in three reference sources, ranked by perceptual distance (ΔE76 in CIELAB). ΔE < 1 is imperceptible to most viewers; ΔE > 10 is clearly different. When two sources point to the same hex they’re merged into one tile; click any to open that color’s page.

Variations

Click any swatch to explore

Harmonies

Accessibility

Color-vision simulation

How this color appears to viewers with the four major color-vision-deficiency types. Computed via the Machado (2009) physiologically-based model. If a tile matches the original, the color reads the same to that viewer.

#31c4df
Original
#b0bde1
Protanopia
#99acdf
Deuteranopia
#00cecc
Tritanopia
#a7a7a7
Achromatopsia
WCAG contrast

The color used as foreground text against pure white and pure black, with the contrast ratio and WCAG 2.1 grade. Aim for AA (4.5:1) for body text and AA Large (3:1) for 18 pt+ headlines; AAA (7:1) is the gold standard for long-form reading surfaces.

The quick brown foxSample body text at normal size. The wcag minimum for body contrast is 4.5:1 (AA) or 7:1 (AAA).
Failon White
2.08:1
The quick brown foxSample body text at normal size. The wcag minimum for body contrast is 4.5:1 (AA) or 7:1 (AAA).
AAAon Black
10.09:1

Wide gamut

Display P3 representation

The CSS Color 4 wide-gamut form of this color. Both swatches render the same color on every display — the P3 form only diverges from sRGB when a designer pushes channels outside sRGB's reach.

sRGB hex
sRGB hex
##31C4DF
Display P3
Display P3
color(display-p3 0.3860 0.7578 0.8610)
P3 has subtle headroomOKLCH chroma 0.123

Moderately saturated colors gain a small bump in P3 — the difference is usually visible side-by-side on wide-gamut hardware but won't change the character of the color.

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