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Cool Uranus Lagoon

#28c4e6
Notes

Cool Uranus Lagoon (#28C4E6) 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 (191°, 79%, 53%) places it in the highly saturated band at a mid lightness. Best used in small doses, like logos, CTAs, focus rings, or highlight text, where its saturation becomes a feature rather than noise. 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
#28c4e6
RGB
rgb(40, 196, 230)
HSL
hsl(191, 79%, 53%)
HWB
hwb(191 16% 10%)
OKLCH
oklch(75.9% 0.129 217.3)
P3
color(display-p3 0.3741 0.7576 0.8864)
HSV
hsv(191, 83%, 90%)
LAB
lab(73.31% -26.95 -27.84)
LCH
lch(73.31% 38.75 225.93)
CMYK
cmyk(83%, 15%, 0%, 10%)

Etymology

Cool
adjective

Old English cōl, of low temperature — used as a color modifier as the complement to warm. Cool gray, cool blue: the optical impression of a slight blue-green shift, even within otherwise warm or neutral hues. Sits across the crisp, hushed, pale, and neutral buckets.

Uranus
modifier

Greek Οὐρανός, primeval-sky-god-and-seventh-planet. As a color modifier, uranus implies a primeval-sky-god-and-pale-cyan-seventh-planet quality, the visual register of Greek-Uranus-and-Herschel-discovery hand-primeval-sky-god-and-pale-cyan-seventh-planet Greek-Uranus-and-Herschel-discovery-and-tilted-axis uranus-and-primeval-sky-god surfaces under Greek-Uranus-and-Herschel-discovery-and-tilted-axis 1781-Slough-discovery-and-side-rolling-planet pale-cyan-planet-light. Sits at the modifier-and-zodiac end of the grid, parallel to neptune 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.

#28c4e6
Original
#aebee8
Protanopia
#95ace6
Deuteranopia
#00d0cf
Tritanopia
#a5a5a5
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
2.07:1
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
10.13:1

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
##28C4E6
Display P3
Display P3
color(display-p3 0.3741 0.7576 0.8864)
P3 has subtle headroomOKLCH chroma 0.129

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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