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Clean Ares Lagoon

#51aadf
Notes

Clean Ares Lagoon (#51AADF) is a true azure with a vibrant character. It holds its own as a focal accent, carrying visual weight without tipping into neon territory. Its HSL profile (202°, 69%, 60%) 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 orange. For something softer, pull in its analogous neighbors on either side of the wheel.

HEX
#51aadf
RGB
rgb(81, 170, 223)
HSL
hsl(202, 69%, 60%)
HWB
hwb(202 32% 13%)
OKLCH
oklch(70.5% 0.115 237.7)
P3
color(display-p3 0.4087 0.6587 0.8556)
HSV
hsv(202, 64%, 87%)
LAB
lab(66.38% -10.63 -34.65)
LCH
lch(66.38% 36.24 252.94)
CMYK
cmyk(64%, 24%, 0%, 13%)

Etymology

Clean
adjective

Old English clǣne, pure, free of dirt — used as a color modifier since the medieval period for hues that read as crisp and uncontaminated by other pigments. Clean white, clean blue: moderate saturation combined with optical clarity. Sits at the crisp-bucket center alongside clear and true.

Ares
modifier

Greek Ἄρης, god-of-war. As a color modifier, ares implies a war-god-and-iron-and-blood quality, the visual register of Olympian-Ares-and-Spartan-temple-Ares hand-war-god-and-iron-and-blood Olympian-Ares-and-Spartan-temple-and-Areopagus ares-and-war-god-and-iron-and-blood surfaces under Olympian-Ares-and-Spartan-temple-and-Areopagus Athenian-Acropolis-and-rocky-outcrop war-god-light. Sits at the modifier-and-myth end of the grid, parallel to zeus and atlas 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.

#51aadf
Original
#91a9e1
Protanopia
#7e9bde
Deuteranopia
#00b8bc
Tritanopia
#9b9b9b
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
2.57:1
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
8.17:1

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
##51AADF
Display P3
Display P3
color(display-p3 0.4087 0.6587 0.8556)
P3 has subtle headroomOKLCH chroma 0.115

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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