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Resonant Malt Ultramarine

#243fa4
Notes

Resonant Malt Ultramarine (#243FA4) is a true blue with a cool character. It leans cool, sitting on the blue, green, and violet side of the wheel. Quiet and dependable, a fit for product UI and data visualization. Its HSL profile (227°, 64%, 39%) 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
#243fa4
RGB
rgb(36, 63, 164)
HSL
hsl(227, 64%, 39%)
HWB
hwb(227 14% 36%)
OKLCH
oklch(41.5% 0.166 267.1)
P3
color(display-p3 0.1654 0.2443 0.6196)
HSV
hsv(227, 78%, 64%)
LAB
lab(30.90% 27.44 -57.31)
LCH
lch(30.90% 63.54 295.59)
CMYK
cmyk(78%, 62%, 0%, 36%)

Etymology

Resonant
adjective

Latin resonāns, echoing — present-participle of resonate, sharing root with sonance. As a color modifier, resonant implies a saturated-and-deep-vibrating quality where the hue carries low-frequency visual richness. Sits at the bold-and-resonant end of the grid, parallel to sonorous and resounding in usage.

Malt
modifier

Old English mealt, germinated-grain. As a color modifier, malt implies a kilned-grain-and-amber-stout quality, the visual register of Burton-on-Trent-and-Bavarian-malt hand-kilned-grain-and-amber-stout Burton-on-Trent-and-Bavarian-malt-and-Munich-and-Pilsen malt-and-kilned-grain surfaces under Burton-on-Trent-and-Bavarian-malt-and-Munich-and-Pilsen Burton-and-Munich-and-Pilsen brewery-and-kiln-light. Sits at the modifier-and-flavor end of the grid, parallel to syrup and zest 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.

#243fa4
Original
#004fa7
Protanopia
#0043a2
Deuteranopia
#00596b
Tritanopia
#414141
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
9.04:1
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
2.32:1

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
##243FA4
Display P3
Display P3
color(display-p3 0.1654 0.2443 0.6196)
P3 has subtle headroomOKLCH chroma 0.166

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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