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Disciplined Virtus Lagoon

#15bbd4
Notes

Disciplined Virtus Lagoon (#15BBD4) 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 (188°, 82%, 46%) 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
#15bbd4
RGB
rgb(21, 187, 212)
HSL
hsl(188, 82%, 46%)
HWB
hwb(188 8% 17%)
OKLCH
oklch(72.8% 0.124 211.9)
P3
color(display-p3 0.3396 0.7225 0.8184)
HSV
hsv(188, 90%, 83%)
LAB
lab(69.79% -29.50 -23.46)
LCH
lch(69.79% 37.70 218.49)
CMYK
cmyk(90%, 12%, 0%, 17%)

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.

Virtus
modifier

Latin virtus, manliness-and-courage-and-virtue. As a color modifier, virtus implies a Roman-virtus-and-stoic-and-Cardinal-Virtues quality, the visual register of Roman-virtus-and-Stoic-Cardinal-Virtues hand-Roman-virtus-and-stoic-and-Cardinal-Virtues Roman-virtus-and-Stoic-Cardinal-Virtues-and-Marcus-Aurelius virtus-and-Roman-virtus surfaces under Roman-virtus-and-Stoic-Cardinal-Virtues-and-Marcus-Aurelius Republican-Rome-and-Marcus-Aurelius Stoic-virtue-light. Sits at the modifier-and-Latin end of the grid, parallel to senex and dux 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.

#15bbd4
Original
#a8b4d5
Protanopia
#90a3d4
Deuteranopia
#00c5c3
Tritanopia
#9a9a9a
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
2.31:1
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
9.09:1

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
##15BBD4
Display P3
Display P3
color(display-p3 0.3396 0.7225 0.8184)
P3 has subtle headroomOKLCH chroma 0.124

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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