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Defined Meteor Turquoise

#21b1ba
Notes

Defined Meteor Turquoise (#21B1BA) 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 (184°, 70%, 43%) 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
#21b1ba
RGB
rgb(33, 177, 186)
HSL
hsl(184, 70%, 43%)
HWB
hwb(184 13% 27%)
OKLCH
oklch(69.5% 0.112 201.6)
P3
color(display-p3 0.3328 0.6840 0.7215)
HSV
hsv(184, 82%, 73%)
LAB
lab(65.99% -32.15 -14.90)
LCH
lch(65.99% 35.44 204.87)
CMYK
cmyk(82%, 5%, 0%, 27%)

Etymology

Defined
adjective

Latin dēfīnīre, to set bounds — past-participle of define. As a color modifier, defined implies a clear-and-edge-distinct-and-precise quality where the hue carries the visual register of sharp-bounded-and-clearly-delimited surface. Sits at the crisp-and-clear end of the grid, parallel to crisp and sharp in usage.

Meteor
modifier

Greek μετέωρος, suspended-in-air. As a color modifier, meteor implies a streaking-and-burning-and-shooting-star quality, the visual register of Perseids-and-Leonids-meteor hand-streaking-and-burning-and-shooting-star Perseids-and-Leonids-and-Geminids-meteor meteor-and-streaking-and-burning-and-shooting-star surfaces under Perseids-and-Leonids-and-Geminids-meteor August-and-November-and-December-night-sky shooting-star-light. Sits at the modifier-and-cosmic end of the grid, parallel to comet and nova 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.

#21b1ba
Original
#a3a9bb
Protanopia
#8e9abb
Deuteranopia
#00b8b3
Tritanopia
#939393
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
2.60:1
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
8.06:1

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
##21B1BA
Display P3
Display P3
color(display-p3 0.3328 0.6840 0.7215)
P3 has subtle headroomOKLCH chroma 0.112

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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