#374151 colour

#374151 is a dark greyish sky blue close to CSS darkslategray. RGB 55, 65, 81, HSL 217, 19%, 27%. White text passes AAA (10.31:1), black fails (2.04:1).

#374151

Nearest CSS name: darkslategray #2f4f4f (not an exact match)
Described as: a dark greyish sky blue
Red, green, blue: 55, 65, 81
Tailwind CSS: gray-700
Web safe: No
Luminance: 0.0519 (WCAG relative luminance, 0 is black, 1 is white)

Colour codes

HEX	`#374151`
RGB	`rgb(55, 65, 81)`
RGB (percent)	`rgb(21.6% 25.5% 31.8%)`
HSL	`hsl(216.9, 19.1%, 26.7%)`
HSV / HSB	`hsv(216.9, 32.1%, 31.8%)`
HWB	`hwb(216.9 21.6% 68.2%)`
CMYK (naive)	`cmyk(32%, 20%, 0%, 68%)`
CIELAB (D50)	`lab(27.13% -0.95 -11.13)`
OKLCH	`oklch(37.29% 0.0306 259.73)`
Decimal	`3621201`

CMYK here is the plain formula with no colour profile, so treat it as a starting point; a printer's profile gives the real ink values. CIELAB uses a D50 white point, as CSS lab() does. HSV is not a CSS function, so it is shown for design apps only.

Contrast with white and black text

White text, 10.31:1The quick brown fox jumps over the lazy dog.

Black text, 2.04:1The quick brown fox jumps over the lazy dog.

Text	Ratio	AA normal (4.5)	AA large (3)	AAA normal (7)	AAA large (4.5)
White	10.31:1	Pass	Pass	Pass	Pass
Black	2.04:1	Fail	Fail	Fail	Fail

White text is the better choice on #374151 (10.31:1). Ratios use the WCAG 2.2 formula; large text means at least 24px, or 18.66px bold. Check another pair.

Tints and shades

Mixed with white, then with black, in ten even steps (straight sRGB mixing, as most design tools do).

9%#495261 18%#5b6471 27%#6e7580 36%#808690 45%#9297a0 55%#a4a9b0 64%#b6bac0 73%#c8cbd0 82%#dbdcdf 91%#edeeef

9%#323b4a 18%#2d3542 27%#282f3b 36%#232934 45%#1e232c 55%#191e25 64%#14181d 73%#0f1216 82%#0a0c0f 91%#050607

Colour harmonies

Hue turned around the HSL colour wheel, saturation and lightness kept.

Complementary

The hue opposite on the colour wheel (180°).

#374151 #514737

Analogous

Neighbours 30° either side.

#374e51 #374151 #3a3751

Triadic

Three hues 120° apart.

#374151 #513741 #415137

Split complementary

The two hues either side of the complement (150° and 210°).

#374151 #513a37 #4e5137

Tetradic (square)

Four hues 90° apart.

#374151 #51374e #514737 #37513a

How it looks with colour blindness

Normal vision#374151 Protanopia#3c4252 Deuteranopia#393f51 Tritanopia#304446 Achromatopsia#404040

Simulated with the Machado, Oliveira and Fernandes (2009) matrices at full severity, applied in linear RGB; achromatopsia shows the colour's luminance as grey. Milder forms (protanomaly, deuteranomaly) are far more common and shift colours less. Never use colour as the only way to carry meaning.

Tailwind gray scale

50#f9fafb 100#f3f4f6 200#e5e7eb 300#d1d5db 400#9ca3af 500#6b7280 600#4b5563 700#374151 800#1f2937 900#111827 950#030712

CSS

Text colour	`color: #374151;`
Background	`background-color: #374151;`
Border	`border: 1px solid #374151;`
Half transparent	`background-color: rgb(55 65 81 / 50%);`
Custom property	`--colour-main: #374151;`
Gradient to a darker shade	`background: linear-gradient(135deg, #374151, #212731);`
Gradient from a lighter tint	`background: linear-gradient(180deg, #878d97, #374151);`
Text on this colour	`background-color: #374151; color: #fff;`

Similar named colours

Distance is measured in OKLab, scaled by 100; under about 2 is hard to tell apart side by side.

Convert #374151 to other formats · Build a palette from it · Check contrast · All named colours

Colour names from CSS Color Module Level 4. Palette values from the Tailwind CSS v3 default palette (MIT licence) and the Material Design 2014 colour palette as published in Material Design Lite (Apache License 2.0). All other values are calculated from the hex code.