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Adamant Coy Ultramarine

#333fa0
Notes

Adamant Coy Ultramarine (#333FA0) is a true blue with an earthy character. It leans grounded and natural, the kind of color that plays well with wood, clay, linen, and warm neutrals. Its HSL profile (233°, 52%, 41%) 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 amber. For something softer, pull in its analogous neighbors on either side of the wheel.

HEX
#333fa0
RGB
rgb(51, 63, 160)
HSL
hsl(233, 52%, 41%)
HWB
hwb(233 20% 37%)
OKLCH
oklch(41.9% 0.156 272.4)
P3
color(display-p3 0.2092 0.2457 0.6049)
HSV
hsv(233, 68%, 63%)
LAB
lab(31.34% 27.88 -54.15)
LCH
lch(31.34% 60.91 297.24)
CMYK
cmyk(68%, 61%, 0%, 37%)

Etymology

Adamant
adjective

Greek adámas, unconquerable — derived from a- (not) plus damnan (to subdue). As a color modifier, adamant implies a saturated-and-rock-hard quality where the hue maintains diamond-hard pigmentation. Sits at the bold-and-resilient end of the grid, parallel to indomitable and ironclad in usage.

Coy
modifier

Latin quietus, still-and-quiet. As a color modifier, coy implies a shy-and-reserved-and-half-glanced quality, the visual register of Watteau-fête-galante-and-Rococo-coy hand-shy-and-reserved-and-half-glanced Watteau-fête-galante-and-Rococo-and-French-pastoral coyed-and-shy-and-reserved-and-half-glanced surfaces under Watteau-fête-galante-and-Rococo-and-French-pastoral garden-pavilion-and-fan-and-mask powdered-pastel-light. Sits at the modifier-and-mood end of the grid, parallel to meek and charm in usage.

Ultramarine
noun

The pigment ground from lapis lazuli — the Afghan mineral imported through Venice in the late Middle Ages, more expensive by weight than gold during the Renaissance. The color refers to a freshly mixed ultramarine pigment in linseed oil: a saturated, slightly violet-shifted deep blue with the matte finish of micron-ground rock. Deeper than cobalt, cooler than royal, with the art-historical weight of the blue Vermeer reserved for Mary's robe.

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.

#333fa0
Original
#004fa3
Protanopia
#00459e
Deuteranopia
#005769
Tritanopia
#434343
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).
AAAon White
8.90:1
The quick brown foxSample body text at normal size. The wcag minimum for body contrast is 4.5:1 (AA) or 7:1 (AAA).
Failon Black
2.36:1

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
##333FA0
Display P3
Display P3
color(display-p3 0.2092 0.2457 0.6049)
P3 has subtle headroomOKLCH chroma 0.156

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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