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Reliable Tunic Lagoon

#37c2cc
Notes

Reliable Tunic Lagoon (#37C2CC) is a true cyan with a cool character. It leans cool, sitting on the blue, green, and violet side of the wheel. Quiet and dependable, a fit for product UI and data visualization. Its HSL profile (184°, 59%, 51%) 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
#37c2cc
RGB
rgb(55, 194, 204)
HSL
hsl(184, 59%, 51%)
HWB
hwb(184 22% 20%)
OKLCH
oklch(74.7% 0.115 202.2)
P3
color(display-p3 0.3918 0.7502 0.7915)
HSV
hsv(184, 73%, 80%)
LAB
lab(72.06% -32.61 -15.60)
LCH
lch(72.06% 36.15 205.57)
CMYK
cmyk(73%, 5%, 0%, 20%)

Etymology

Reliable
adjective

Latin re-ligāre, to bind back — adjectival suffix -able. As a color modifier, reliable implies a clear-and-trustworthy-and-consistent quality where the hue carries the visual register of dependable-and-consistent design-element. Sits at the crisp-and-honest end of the grid, parallel to dependable and trustworthy 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.

#37c2cc
Original
#b3bacd
Protanopia
#9eaacd
Deuteranopia
#00cac5
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
2.15:1
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
9.75:1

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
##37C2CC
Display P3
Display P3
color(display-p3 0.3918 0.7502 0.7915)
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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