#339999 colour

#339999 is a muted cyan close to CSS cadetblue: RGB 51, 153, 153, HSL 180, 50%, 40%. Black text passes AA (6.16:1). Tints, shades and colour harmonies.

#339999

Nearest CSS name: cadetblue #5f9ea0 (not an exact match)
Described as: a muted cyan
Red, green, blue: 51, 153, 153
Web safe: Yes, one of the 216 web-safe colours
Luminance: 0.2579 (WCAG relative luminance, 0 is black, 1 is white)

Colour codes

HEX	`#339999`
HEX (short)	`#399`
RGB	`rgb(51, 153, 153)`
RGB (percent)	`rgb(20% 60% 60%)`
HSL	`hsl(180, 50%, 40%)`
HSV / HSB	`hsv(180, 66.7%, 60%)`
HWB	`hwb(180 20% 40%)`
CMYK (naive)	`cmyk(67%, 0%, 0%, 40%)`
CIELAB (D50)	`lab(57.56% -29.9 -9.07)`
OKLCH	`oklch(62.58% 0.0915 195.07)`
Decimal	`3381657`

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, 3.41:1The quick brown fox jumps over the lazy dog.

Black text, 6.16:1The 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	3.41:1	Fail	Pass	Fail	Fail
Black	6.16:1	Pass	Pass	Fail	Pass

Black text is the better choice on #339999 (6.16:1). 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%#46a2a2 18%#58acac 27%#6bb5b5 36%#7dbebe 45%#90c7c7 55%#a2d1d1 64%#b5dada 73%#c7e3e3 82%#daecec 91%#ecf6f6

9%#2e8b8b 18%#2a7d7d 27%#256f6f 36%#206161 45%#1c5353 55%#174646 64%#133838 73%#0e2a2a 82%#091c1c 91%#050e0e

Colour harmonies

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

Complementary

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

#339999 #993333

Analogous

Neighbours 30° either side.

#339966 #339999 #336699

Triadic

Three hues 120° apart.

#339999 #993399 #999933

Split complementary

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

#339999 #993366 #996633

Tetradic (square)

Four hues 90° apart.

#339999 #663399 #993333 #669933

How it looks with colour blindness

Normal vision#339999 Protanopia#8f9299 Deuteranopia#7f869a Tritanopia#009e99 Achromatopsia#8b8b8b

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.

CSS

Text colour	`color: #339999;`
Background	`background-color: #339999;`
Border	`border: 1px solid #339999;`
Half transparent	`background-color: rgb(51 153 153 / 50%);`
Custom property	`--colour-main: #339999;`
Gradient to a darker shade	`background: linear-gradient(135deg, #339999, #1f5c5c);`
Gradient from a lighter tint	`background: linear-gradient(180deg, #85c2c2, #339999);`
Text on this colour	`background-color: #339999; color: #000;`

Similar named colours

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

Convert #339999 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.