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Stable Eddy Lagoon

#21bce1
Notes

Stable Eddy Lagoon (#21BCE1) 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 (192°, 76%, 51%) places it in the highly saturated band at a mid lightness. Best used in small doses, like logos, CTAs, focus rings, or highlight text, where its saturation becomes a feature rather than noise. 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
#21bce1
RGB
rgb(33, 188, 225)
HSL
hsl(192, 76%, 51%)
HWB
hwb(192 13% 12%)
OKLCH
oklch(73.7% 0.128 219.6)
P3
color(display-p3 0.3522 0.7265 0.8662)
HSV
hsv(192, 85%, 88%)
LAB
lab(70.68% -25.07 -29.18)
LCH
lch(70.68% 38.48 229.33)
CMYK
cmyk(85%, 16%, 0%, 12%)

Etymology

Stable
adjective

Latin stabilis, standing-firm — sharing root with stand. As a color modifier, stable implies a clear-and-firm-and-unchanging quality where the hue carries the visual register of resistant-to-modulation-and-fade pigmentation. Sits at the crisp-and-firm end of the grid, parallel to steady and settled in usage.

Eddy
modifier

Old Norse iða, whirlpool-or-current. As a color modifier, eddy implies a small-circling-and-counter-current quality, the visual register of river-bend-and-tidal-pool-eddy hand-small-circling-and-counter-current river-bend-and-tidal-pool-and-rock-shelter eddied-and-small-circling-and-counter-current surfaces under river-bend-and-tidal-pool-and-rock-shelter Highland-burn-and-coastal-cove curl-and-spiral-light. Sits at the modifier-and-mood end of the grid, parallel to swirl and stir 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.

#21bce1
Original
#a5b7e3
Protanopia
#8da5e1
Deuteranopia
#00c8c8
Tritanopia
#9e9e9e
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
2.25:1
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
9.35:1

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
##21BCE1
Display P3
Display P3
color(display-p3 0.3522 0.7265 0.8662)
P3 has subtle headroomOKLCH chroma 0.128

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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