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Bold Slav Cerulean

#0789d4
Notes

Bold Slav Cerulean (#0789D4) is a true azure with a vibrant character. It holds its own as a focal accent, carrying visual weight without tipping into neon territory. Its HSL profile (202°, 94%, 43%) 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 orange. For something softer, pull in its analogous neighbors on either side of the wheel.

HEX
#0789d4
RGB
rgb(7, 137, 212)
HSL
hsl(202, 94%, 43%)
HWB
hwb(202 3% 17%)
OKLCH
oklch(60.7% 0.149 244.2)
P3
color(display-p3 0.2379 0.5291 0.8081)
HSV
hsv(202, 97%, 83%)
LAB
lab(54.75% -3.10 -46.90)
LCH
lch(54.75% 47.00 266.22)
CMYK
cmyk(97%, 35%, 0%, 17%)

Etymology

Bold
adjective

Old English beald, brave, courageous — a quality word that crossed over to color in the late seventeenth century. Bold describes a color that asserts itself: high saturation combined with mid lightness, where the hue presents itself without compromise. Sits at the center of the bold-bucket grid, near strong and rich. Closer to a presence word than a pigment word.

Slav
modifier

Old Slavic Slověninъ, speaker / Slav. As a color modifier, slav implies an Eastern-European quality, the visual register of Slavonic-Russian-Polish-Czech hand-built Onion-domed-cathedral-and-folk-hand-painted Slavic-folk-tradition surfaces under Russian-Orthodox-and-Czech-and-Polish folk-painting cathedral light. Sits at the modifier-and-cultural end of the grid, parallel to roman and celtic in usage.

Cerulean
noun

From the Latin caeruleum, originally referring to dark blue paint pigment of the Roman world, then via French céruléen into English. As a modern art-supply name, cerulean blue is the cobalt-tin oxide pigment introduced in 1805. The color refers to a clean, slightly green-shifted blue with the matte finish of mineral pigment in linseed oil: lighter than cobalt, deeper than aqua, with the painter's weight of a word for sky.

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.

#0789d4
Original
#648cd7
Protanopia
#497cd3
Deuteranopia
#009ba4
Tritanopia
#737373
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).
AA Largeon White
3.79:1
The quick brown foxSample body text at normal size. The wcag minimum for body contrast is 4.5:1 (AA) or 7:1 (AAA).
AAon Black
5.54:1

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
##0789D4
Display P3
Display P3
color(display-p3 0.2379 0.5291 0.8081)
P3 has subtle headroomOKLCH chroma 0.149

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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