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Recognised as Colour

#557DC9

  • #557DC9
  • Blue
  • Dark
  • Nearest: Cornflower blue

#557DC9 is a blue with RGB values 85, 125, 201 and HSL 219°, 52%, 56%. It is a dark colour, so black text on it reaches 5.2:1 contrast (AA for normal text). The nearest named colour is Cornflower blue.

Colour values

#557DC9#557DC9
HEX#557DC9
RGBrgb(85, 125, 201)
RGB (0–1)0.3333, 0.4902, 0.7882
RGB percentages33.3%, 49%, 78.8%
HSLhsl(219.3, 51.8%, 56.1%)
HSV / HSBhsv(219.3, 57.7%, 78.8%)
CMYK57.7%, 37.8%, 0%, 21.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,602,761
CSS custom property--colour: #557DC9;

Brightness & contrast

Relative luminance0.20816WCAG 2.x, 0 is black and 1 is white
Perceived brightness126.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.16:1
Contrast with white4.07:1WCAG normal text: Fail
Contrast with black5.16:1WCAG normal text: AA
Greyscale equivalent#7A7A7A
Inverted#AA8236

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#5D84CCno red cones; affects about 1% of men; ΔE 3.7 from the original
Deuteranopia#4E79C7no green cones; the most common form, about 1% of men; ΔE 2.1 from the original
Tritanopia#008E99no blue cones; rare, and affects men and women equally; ΔE 46.4 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.07:1WCAG large text: AA
Contrast with black, large text5.16:1WCAG large text: AAA

Named colours

Cornflower blue · ΔE 10.8Steel blue · ΔE 17.4Dodgerblue · ΔE 20.8Dark slateblue · ΔE 27.9Royal blue · ΔE 28.1Medium purple · ΔE 28.7
Nearest named CSS colourCornflower blue (#6495ED)ΔE 10.75, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#C9A155
Analogous#55B7C9, #6755C9
Triadic#C9557D, #7DC955
Split complementary#C96755, #B7C955
Tetradic#C955B7, #C9A155, #55C967

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#F0F3FA
Lighter +30%#C9D6EE
Lighter +20%#A2B8E2
Lighter +10%#7C9BD5
Darker −10%#3963B2
Darker −20%#2C4D8C
Darker −30%#203865
Darker −40%#14223E
More saturated +25%#3974E5
Less saturated −25%#7186AD

Channel breakdown

R85
G125
B201
Red85 (33.3%)
Green125 (49%)
Blue201 (78.8%)
Hue219.31°
Saturation (HSL)51.79%
Lightness56.08%
Dominant channelBlue
Hex per channelR 55 · G 7D · B C9

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Every value on this page was computed from “557dc9” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.