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Disciplined Median Teal

#21d2df
Notes

Disciplined Median Teal (#21D2DF) 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°, 75%, 50%) 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
#21d2df
RGB
rgb(33, 210, 223)
HSL
hsl(184, 75%, 50%)
HWB
hwb(184 13% 13%)
OKLCH
oklch(78.9% 0.130 203.0)
P3
color(display-p3 0.3914 0.8116 0.8644)
HSV
hsv(184, 85%, 87%)
LAB
lab(77.12% -36.36 -18.27)
LCH
lch(77.12% 40.69 206.68)
CMYK
cmyk(85%, 6%, 0%, 13%)

Etymology

Disciplined
adjective

Latin disciplīna, teaching / training — past-participle of discipline. As a color modifier, disciplined implies a clear-and-controlled-and-careful quality where the hue carries the visual register of careful-edited-and-restrained design-decision. Sits at the crisp-and-orderly end of the grid, parallel to methodical and orderly in usage.

Median
modifier

Latin Medi, Medes. As a color modifier, median implies an ancient-Iranian-and-Median-Empire quality, the visual register of Median-Empire-of-Ecbatana pre-Achaemenid Iranian-Median highland-kingdom hand-built fortress-and-temple surfaces under Median-Empire-of-Ecbatana pre-Achaemenid Iranian-Highland fortress light. Sits at the modifier-and-cultural end of the grid, parallel to persia and achaemenid in usage.

Teal
noun

Anas crecca, the small dabbling duck whose male in breeding plumage sports a chestnut head crossed by a glossy green-blue stripe. The color refers to that stripe — the iridescent panel just behind the eye: a saturated, slightly muted blue-green with the optical depth of structural color rather than pigment. Cooler than cypress, warmer than cerulean, with the ornithological specificity of a color named for one feather of one bird.

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.

#21d2df
Original
#c0c9e0
Protanopia
#a8b7e0
Deuteranopia
#00dbd6
Tritanopia
#adadad
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
1.85:1
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
11.35:1

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
##21D2DF
Display P3
Display P3
color(display-p3 0.3914 0.8116 0.8644)
P3 has subtle headroomOKLCH chroma 0.130

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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