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Genuine Swoop Turquoise

#21b5c4
Notes

Genuine Swoop Turquoise (#21B5C4) 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 (186°, 71%, 45%) 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
#21b5c4
RGB
rgb(33, 181, 196)
HSL
hsl(186, 71%, 45%)
HWB
hwb(186 13% 23%)
OKLCH
oklch(70.8% 0.116 205.8)
P3
color(display-p3 0.3399 0.6995 0.7588)
HSV
hsv(186, 83%, 77%)
LAB
lab(67.54% -30.96 -18.08)
LCH
lch(67.54% 35.85 210.29)
CMYK
cmyk(83%, 8%, 0%, 23%)

Etymology

Genuine
adjective

Latin genuinus, natural, innate — used as a color modifier since the sixteenth century for hues that read as authentic rather than imitated. Genuine indigo, genuine ochre: moderate-to-high saturation combined with the optical impression of a hue from real pigment rather than synthetic dye. Sits at the crisp-bucket alongside true and honest.

Swoop
modifier

Old English swāpan, to-sweep-down. As a color modifier, swoop implies a fast-descending-and-arcing-down quality, the visual register of peregrine-falcon-and-stooping-hawk-swoop hand-fast-descending-and-arcing-down peregrine-falcon-and-stooping-hawk-and-eagle swooped-and-fast-descending-and-arcing-down surfaces under peregrine-falcon-and-stooping-hawk-and-eagle cliff-face-and-moorland-and-open-sky raptor-stoop-light. Sits at the modifier-and-mood end of the grid, parallel to flit and glide in usage.

Turquoise
noun

The hydrated copper-aluminum phosphate mined in Persia and the American Southwest for thousands of years — the firuze of Iran, the chalchihuitl of Mesoamerica, the heart of Pueblo and Navajo silverwork. The color refers to a fine Sleeping Beauty turquoise from Arizona: a saturated, slightly green-shifted blue with the slight matrix of host-rock veining. Brighter than persian, lighter than cerulean.

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.

#21b5c4
Original
#a5adc5
Protanopia
#909ec4
Deuteranopia
#00bdb9
Tritanopia
#979797
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
2.48:1
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
8.47:1

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
##21B5C4
Display P3
Display P3
color(display-p3 0.3399 0.6995 0.7588)
P3 has subtle headroomOKLCH chroma 0.116

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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