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Tough Sirocco Royal

#4367e5
Notes

Tough Sirocco Royal (#4367E5) is a true blue with a vibrant character. It holds its own as a focal accent, carrying visual weight without tipping into neon territory. Its HSL profile (227°, 76%, 58%) 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 amber. For something softer, pull in its analogous neighbors on either side of the wheel.

HEX
#4367e5
RGB
rgb(67, 103, 229)
HSL
hsl(227, 76%, 58%)
HWB
hwb(227 26% 10%)
OKLCH
oklch(56.0% 0.195 267.6)
HSV
hsv(227, 71%, 90%)
LAB
lab(47.69% 29.21 -67.75)
LCH
lch(47.69% 73.78 293.32)
CMYK
cmyk(71%, 55%, 0%, 10%)

Etymology

Tough
adjective

Old English tōh, firm / tenacious — sharing root with German zäh. As a color modifier, tough implies a saturated-and-resilient quality where the hue resists fading-and-modulation through its strong pigmentation. Sits at the bold-and-resilient end of the grid, parallel to rugged and hardy in usage.

Sirocco
modifier

Arabic sharq, eastern-or-Saharan-wind. As a color modifier, sirocco implies a hot-Saharan-and-Mediterranean-wind quality, the visual register of Saharan-and-Sicilian-and-Maltese-sirocco hand-hot-Saharan-and-Mediterranean-wind Saharan-and-Sicilian-and-Maltese-sirocco-and-North-African sirocco-and-hot-Saharan-and-Mediterranean-wind surfaces under Saharan-and-Sicilian-and-Maltese-sirocco-and-North-African Sahara-and-Sicily-and-Malta-and-Tunis hot-North-African-wind-light. Sits at the modifier-and-weather end of the grid, parallel to mistral and zephyr in usage.

Royal
noun

The blue of European royal court dress and regalia from the late seventeenth century forward — the color of British peers' robes, French royal sashes, the lining of the crown-jewel cases. The color refers to a saturated, slightly violet-shifted blue with the matte finish of velvet or melton wool dyed to maximum intensity: deeper than cornflower, warmer than ultramarine, with the heraldic weight of a color reserved for monarchs and the official Crown.

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

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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.

#4367e5
Original
#0079e9
Protanopia
#006ae2
Deuteranopia
#00869c
Tritanopia
#686868
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).
AAon White
4.87:1
The quick brown foxSample body text at normal size. The wcag minimum for body contrast is 4.5:1 (AA) or 7:1 (AAA).
AA Largeon Black
4.31:1

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