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Lucid Tunic Lagoon

#37b3d4
Notes

Lucid Tunic Lagoon (#37B3D4) 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 (193°, 65%, 52%) 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
#37b3d4
RGB
rgb(55, 179, 212)
HSL
hsl(193, 65%, 52%)
HWB
hwb(193 22% 17%)
OKLCH
oklch(71.4% 0.115 219.8)
P3
color(display-p3 0.3679 0.6923 0.8168)
HSV
hsv(193, 74%, 83%)
LAB
lab(67.87% -22.71 -26.35)
LCH
lch(67.87% 34.79 229.24)
CMYK
cmyk(74%, 16%, 0%, 17%)

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.

Tunic
modifier

Latin tunica, Roman-undergarment. As a color modifier, tunic implies a Roman-tunic-and-medieval-undergarment quality, the visual register of Roman-tunic-and-medieval-bliaut hand-Roman-tunic-and-medieval-undergarment Roman-tunic-and-medieval-bliaut-and-Carolingian-court tunic-and-Roman-tunic-and-medieval-undergarment surfaces under Roman-tunic-and-medieval-bliaut-and-Carolingian-court Republican-and-Carolingian-Aachen Roman-and-medieval-light. Sits at the modifier-and-textile end of the grid, parallel to chiton and peplos 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.

#37b3d4
Original
#9faed6
Protanopia
#899fd4
Deuteranopia
#00bebe
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
2.45:1
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
8.56:1

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
##37B3D4
Display P3
Display P3
color(display-p3 0.3679 0.6923 0.8168)
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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