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Recognised as Colour

#577CDD

  • #577CDD
  • Blue
  • Dark
  • Nearest: Cornflower blue

#577CDD is a blue with RGB values 87, 124, 221 and HSL 223°, 66%, 60%. It is a dark colour, so black text on it reaches 5.3:1 contrast (AA for normal text). The nearest named colour is Cornflower blue.

Colour values

#577CDD#577CDD
HEX#577CDD
RGBrgb(87, 124, 221)
RGB (0–1)0.3412, 0.4863, 0.8667
RGB percentages34.1%, 48.6%, 86.7%
HSLhsl(223.4, 66.3%, 60.4%)
HSV / HSBhsv(223.4, 60.6%, 86.7%)
CMYK60.6%, 43.9%, 0%, 13.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,733,597
CSS custom property--colour: #577CDD;

Brightness & contrast

Relative luminance0.21662WCAG 2.x, 0 is black and 1 is white
Perceived brightness129.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.33:1
Contrast with white3.94:1WCAG normal text: Fail
Contrast with black5.33:1WCAG normal text: AA
Greyscale equivalent#7B7B7B
Inverted#A88322

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#4F87E1no red cones; affects about 1% of men; ΔE 7.7 from the original
Deuteranopia#3B7BDBno green cones; the most common form, about 1% of men; ΔE 5 from the original
Tritanopia#0092A2no blue cones; rare, and affects men and women equally; ΔE 56.1 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text3.94:1WCAG large text: AA
Contrast with black, large text5.33:1WCAG large text: AAA

Named colours

Cornflower blue · ΔE 11.8Dodgerblue · ΔE 13.1Royal blue · ΔE 16.3Medium purple · ΔE 20.6Slate blue · ΔE 21.6Medium slateblue · ΔE 27.3
Nearest named CSS colourCornflower blue (#6495ED)ΔE 11.78, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#DDB857
Analogous#57BFDD, #7557DD
Triadic#DD577C, #7CDD57
Split complementary#DD7557, #BFDD57
Tetradic#DD57BF, #DDB857, #57DD75

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#D6DFF7
Lighter +20%#ACBEEE
Lighter +10%#819DE6
Darker −10%#2D5BD4
Darker −20%#2348AB
Darker −30%#1A3681
Darker −40%#122556
More saturated +25%#3E71F6
Less saturated −25%#7087C4

Channel breakdown

R87
G124
B221
Red87 (34.1%)
Green124 (48.6%)
Blue221 (86.7%)
Hue223.43°
Saturation (HSL)66.34%
Lightness60.39%
Dominant channelBlue
Hex per channelR 57 · G 7C · B DD

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Every value on this page was computed from “577cdd” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.