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Recognised as Colour

#557C81

  • #557C81
  • Cyan
  • Dark
  • Nearest: Slate grey

#557C81 is a cyan with RGB values 85, 124, 129 and HSL 187°, 21%, 42%. It is a dark colour, so black text on it reaches 4.6:1 contrast (AA for normal text). The nearest named colour is Slate grey.

Colour values

#557C81#557C81
HEX#557C81
RGBrgb(85, 124, 129)
RGB (0–1)0.3333, 0.4863, 0.5059
RGB percentages33.3%, 48.6%, 50.6%
HSLhsl(186.8, 20.6%, 42%)
HSV / HSBhsv(186.8, 34.1%, 50.6%)
CMYK34.1%, 3.9%, 0%, 49.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,602,433
CSS custom property--colour: #557C81;

Brightness & contrast

Relative luminance0.17932WCAG 2.x, 0 is black and 1 is white
Perceived brightness114.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 4.59:1
Contrast with white4.58:1WCAG normal text: AA
Contrast with black4.59:1WCAG normal text: AA
Greyscale equivalent#747474
Inverted#AA837E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#767981no red cones; affects about 1% of men; ΔE 13.1 from the original
Deuteranopia#6E7381no green cones; the most common form, about 1% of men; ΔE 13.5 from the original
Tritanopia#457F7Dno blue cones; rare, and affects men and women equally; ΔE 7.6 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.58:1WCAG large text: AAA
Contrast with black, large text4.59:1WCAG large text: AAA

Named colours

Slate grey · ΔE 11.2Light slate grey · ΔE 12.6Cadetblue · ΔE 13.9Gray · ΔE 14.8Dim grey · ΔE 15Teal · ΔE 16.7
Nearest named CSS colourSlate grey (#708090)ΔE 11.23, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#815A55
Analogous#558170, #556681
Triadic#81557C, #7C8155
Split complementary#815566, #817055
Tetradic#705581, #815A55, #668155

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C8D8DA
Lighter +30%#A9C3C6
Lighter +20%#8AADB2
Lighter +10%#6B989E
Darker −10%#415E62
Darker −20%#2C4144
Darker −30%#182325
Darker −40%#040606
More saturated +25%#3A919C
Less saturated −25%#6B6B6B

Channel breakdown

R85
G124
B129
Red85 (33.3%)
Green124 (48.6%)
Blue129 (50.6%)
Hue186.82°
Saturation (HSL)20.56%
Lightness41.96%
Dominant channelBlue
Hex per channelR 55 · G 7C · B 81

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Every value on this page was computed from “557c81” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.