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Workmanlike Steel

#337bb1
Notes

Workmanlike Steel (#337BB1) is a true azure 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 (206°, 55%, 45%) 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 orange. For something softer, pull in its analogous neighbors on either side of the wheel.

HEX
#337bb1
RGB
rgb(51, 123, 177)
HSL
hsl(206, 55%, 45%)
HWB
hwb(206 20% 31%)
OKLCH
oklch(56.3% 0.110 244.4)
HSV
hsv(206, 71%, 69%)
LAB
lab(49.55% -4.28 -35.08)
LCH
lch(49.55% 35.34 263.04)
CMYK
cmyk(71%, 31%, 0%, 31%)

Etymology

Workmanlike
adjective

Old English weorcmann, workman — adjectival suffix -like. As a color modifier, workmanlike implies a clear-and-skilled-and-honest quality where the hue carries the visual register of journeyman-craftsman careful-and-competent hand-built craft. Sits at the crisp-and-functional end of the grid, parallel to functional and practical in usage.

Steel
noun

An iron-carbon alloy hardened by heat treatment — and steel blue refers specifically to the blue oxide layer that forms on tempered steel as it's heated through 290°C, the temper colors a blacksmith reads to gauge the correct hardness. The color is the blue of a freshly tempered file: a soft, slightly muted gray-blue with the metallic finish of an oxidation layer. Cooler than slate, warmer than denim.

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.

#337bb1
Original
#637cb3
Protanopia
#5170b0
Deuteranopia
#00888e
Tritanopia
#707070
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
4.56:1
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
4.61:1

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